Radio Chirps but no audio

6/21/2011 10:46:52 PMBubba

OK so I started a new post for my Philco because I cannot figure it out and need help with this one.

All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.

As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..

Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.

Now any suggestions on what to try?

THX Bubba

6/22/2011 1:02:45 AMBubba

OK I got it working. i have radio...

I do not understand the following.
In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.

The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..

Is this suppoes to be a hot chassis like this?

Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?

:OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
:
:All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
:
:As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
:
:Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
:
:Now any suggestions on what to try?
:
:THX Bubba
:

6/22/2011 5:36:12 AMJohnnysan

:
:OK I got it working. i have radio...
:
:I do not understand the following.
:In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
:
:The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
:
:Is this suppoes to be a hot chassis like this?
:
:Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
:
:
:
:
:
::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
::
::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
::
::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
::
::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
::
::Now any suggestions on what to try?
::
::THX Bubba
::
:
:

You may have the polarity of the primary or secondary of the replaced IF transformer wrong.
Johnnysan-

6/22/2011 10:16:28 AMBubba

What would that cause?

::
::OK I got it working. i have radio...
::
::I do not understand the following.
::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
::
::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
::
::Is this suppoes to be a hot chassis like this?
::
::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
::
::
::
::
::
:::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
:::
:::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
:::
:::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
:::
:::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
:::
:::Now any suggestions on what to try?
:::
:::THX Bubba
:::
::
::
:
:
:You may have the polarity of the primary or secondary of the replaced IF transformer wrong.
:Johnnysan-
:
:
:
:

6/22/2011 10:52:11 PMEdd

Sir Bubba. . . . .

Where we wuz . . . I dun fergitted !

A bit of clarification on the procedure of monitoring for the presence of an IF output signal from a MIXER stage . . . or on further down the IF strip, even up to its input into the AM detector stage. . . with its increasing in strength progressively.

This being after I surmised the fully perceived semantics of your statement of:

WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore.

With emphasis on that "RF" being inserted, in addition, to the EXPECTED IF.

I am now reading that as your ALSO additionally going frontally to the 7C7 RF stage and clipping on to that plate or 1st grid . . . . now, that is not going to work, as the 456 IF signal does not originate UNTIL the plate of the 7A8 MIXER stage.

And then, you can be connected to that MIXER plate OR the first grid of the IF amplifier stage OR the plate of the IF transformer OR the secondary of the 2nd IF transformer .

A properly operating receiver under test should let you hear the tuned in station of that receiver being tested, on your small monitoring set via the close capacitive coupling being provided the loop antenna of the monitoring receiver . . . . with it being picked up on 910 Khz as a second harmonic of the basic 455 Khz IF signal presence.

Now if you were attempting to connect up to the 1st grid or plate circuitry of the 7C7 RF amplifier and expecting any results on the input or output of the frontal RF stage . . . not gonna hoppen .

BUT there IS a possibility of the RF present there in the 540---1750 spectrum heterodyning within your monitor receiver and accounting for the "squealies" as you were tuning the Philco across the band.

Now back to your newest query about the circuitry in the front of the 7C7 RF amplifier stage.

I am seeing your mentioning the 35 ohms of the secondary of the RF / Antenna input transformer . . .T3 . . . so it says, but have you actually ohmmed it out ?

I am sort of expecting that secondary winding to be open.

Here's the way they designed this sets input RF circuitry:

In these olden tymes of receivers, the larger built in, back of set loop antenna was not yet fully entrenched.

In even older times, they were dependent upon an antenna input coil being wound on sizing upwards up to a 1 inch diameter phenolic form, and being on top of chassis or even worse, shielded away from out of the air RF signal access under the chassis.

No problem . . . as you see, they placed a small tickler winding on the transformer to receive the "piped" in stronger RF signal from an outdoor aerials length of wire, and it inductively couples into the T3 input RF transformer .

This is what you are seeing as your units ~1 ohm primary winding.

The RF input to the 7C7 RF amp is coming in thru that 100 pf capacitor on its 1st grid circuitry, which is tied in to a tunable parallel resonant circuit consisting of the C3 RF variable tuning condenser section and its two alignment assistants C4 + C5.

The inductance aspects of the circuitrty is the series aiding arrangement of the secondary of the T3 transformer along with the LOOP and its somewhart more massive area that it provides in picking up out of the air Rf signal.

The two series coils are working in conjunction . . . with the T3 secondary providing the brunt of the approximate 240 uh ,needed inductance . . . and the larger area cabinetry LOOP, throwing in its wee amount of additional inductance, but mainly, its enhanced signal picking up capability that its MUCH larger exposed surface area is offering , in the picking up of out of the air RF signal.

Now if T3 secondary was open or somehow otherwise not connected, that is leaving your inductive portion of your RF's Inductive and Capacitive resonant tuning circuitry non existant.

Now if the TOP side of that T3 secondary coil is shorted across to its bottom ground connection ( or to the frame of the tuning condenser) and the set starts working, that seems that the T3 secondary continuity is not there, with no resonant circuit continuity into the 1st grid of the RF amp.

HOWEVER, if you shorted across the unit and then the set started playing . . . to a fashion . . .that would have the sole loop winding inductance TRYING to fill in for the combination of series inductances. Thus being VERY deficient in overall inductance, but picking UP stations due to its larger physical area and better off the air RF exposure to stations, than the miniscule sized little T3.

Come back at me with your findings . . . .

73's de Edd

:What would that cause?
:
:

:
:::
:::OK I got it working. i have radio...
:::
:::I do not understand the following.
:::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
:::
:::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
:::
:::Is this suppoes to be a hot chassis like this?
:::
:::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
:::
:::
:::

:::
::::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
::::
::::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
::::
::::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
::::
::::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
::::
::::Now any suggestions on what to try?
::::
::::THX Bubba
::::
:::

::
::
::You may have the polarity of the primary or secondary of the replaced IF transformer wrong.
::Johnnysan-
::
::
::
::
:
:

6/23/2011 12:38:08 AMBubba

T3 is not open.. It reads 35 ohms and the 1 ohm coil reads 1.3 ohms. I rewired the front end on this coils. It is still the same. If I ground the 35 ohm tap I get quite good reception. If I take the jumper off I get noting but noise and chirps across the band.

Not sure why..

:
:

:
:
:
:
:
:
:
:
:
:
:
:Sir Bubba. . . . .
:
:
:Where we wuz . . . I dun fergitted !
:
:
:A bit of clarification on the procedure of monitoring for the presence of an IF output signal from a MIXER stage . . . or on further down the IF strip, even up to its input into the AM detector stage. . . with its increasing in strength progressively.
:
:
:This being after I surmised the fully perceived semantics of your statement of:
:
:
:
:
: WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore.
:
:
:
:
:With emphasis on that "RF" being inserted, in addition, to the EXPECTED IF.
:
:
:I am now reading that as your ALSO additionally going frontally to the 7C7 RF stage and clipping on to that plate or 1st grid . . . . now, that is not going to work, as the 456 IF signal does not originate UNTIL the plate of the 7A8 MIXER stage.
:
:
:And then, you can be connected to that MIXER plate OR the first grid of the IF amplifier stage OR the plate of the IF transformer OR the secondary of the 2nd IF transformer .
:
:
:A properly operating receiver under test should let you hear the tuned in station of that receiver being tested, on your small monitoring set via the close capacitive coupling being provided the loop antenna of the monitoring receiver . . . . with it being picked up on 910 Khz as a second harmonic of the basic 455 Khz IF signal presence.
:
:
:
:Now if you were attempting to connect up to the 1st grid or plate circuitry of the 7C7 RF amplifier and expecting any results on the input or output of the frontal RF stage . . . not gonna hoppen .
:
:
:BUT there IS a possibility of the RF present there in the 540---1750 spectrum heterodyning within your monitor receiver and accounting for the "squealies" as you were tuning the Philco across the band.
:
:
:
:Now back to your newest query about the circuitry in the front of the 7C7 RF amplifier stage.
:
:
:I am seeing your mentioning the 35 ohms of the secondary of the RF / Antenna input transformer . . .T3 . . . so it says, but have you actually ohmmed it out ?
:
:
:I am sort of expecting that secondary winding to be open.
:
:
:Here's the way they designed this sets input RF circuitry:
:
:
:In these olden tymes of receivers, the larger built in, back of set loop antenna was not yet fully entrenched.
:
:
:In even older times, they were dependent upon an antenna input coil being wound on sizing upwards up to a 1 inch diameter phenolic form, and being on top of chassis or even worse, shielded away from out of the air RF signal access under the chassis.
:
:
:No problem . . . as you see, they placed a small tickler winding on the transformer to receive the "piped" in stronger RF signal from an outdoor aerials length of wire, and it inductively couples into the T3 input RF transformer .
:
:
:This is what you are seeing as your units ~1 ohm primary winding.
:
:
:The RF input to the 7C7 RF amp is coming in thru that 100 pf capacitor on its 1st grid circuitry, which is tied in to a tunable parallel resonant circuit consisting of the C3 RF variable tuning condenser section and its two alignment assistants C4 + C5.
:
:
:The inductance aspects of the circuitrty is the series aiding arrangement of the secondary of the T3 transformer along with the LOOP and its somewhart more massive area that it provides in picking up out of the air Rf signal.
:
:
:The two series coils are working in conjunction . . . with the T3 secondary providing the brunt of the approximate 240 uh ,needed inductance . . . and the larger area cabinetry LOOP, throwing in its wee amount of additional inductance, but mainly, its enhanced signal picking up capability that its MUCH larger exposed surface area is offering , in the picking up of out of the air RF signal.
:
:
:Now if T3 secondary was open or somehow otherwise not connected, that is leaving your inductive portion of your RF's Inductive and Capacitive resonant tuning circuitry non existant.
:
:
:Now if the TOP side of that T3 secondary coil is shorted across to its bottom ground connection ( or to the frame of the tuning condenser) and the set starts working, that seems that the T3 secondary continuity is not there, with no resonant circuit continuity into the 1st grid of the RF amp.
:
:
:HOWEVER, if you shorted across the unit and then the set started playing . . . to a fashion . . .that would have the sole loop winding inductance TRYING to fill in for the combination of series inductances. Thus being VERY deficient in overall inductance, but picking UP stations due to its larger physical area and better off the air RF exposure to stations, than the miniscule sized little T3.
:
:
:Come back at me with your findings . . . .
:
:
:
:
:
:
:
:
:
:
:73's de Edd
:
:
:

:

:
:
:
:
:
:
:
:
::What would that cause?
::
::
:
::
::::
::::OK I got it working. i have radio...
::::
::::I do not understand the following.
::::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
::::
::::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
::::
::::Is this suppoes to be a hot chassis like this?
::::
::::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
::::
::::
::::
:
::::
:::::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
:::::
:::::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
:::::
:::::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
:::::
:::::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
:::::
:::::Now any suggestions on what to try?
:::::
:::::THX Bubba
:::::
::::
:
:::
:::
:::You may have the polarity of the primary or secondary of the replaced IF transformer wrong.
:::Johnnysan-
:::
:::
:::
:::
::
::
:
:

6/23/2011 1:14:39 AMBubba

Somthing just ocurred ot me when I was looking at the schematic. My Radio is the newer one with the Resistors instead of the choke and the 50Y6 Rectifier.

I was noticing that some of the coil values are reversed to this schemaitc with the 50X6 and choke schematic. Is it possible that all the coil values are mirror image and that on this set the 1 ohm coil is supposed to be in series with the loop antenna and the 36 ohm coil is supposed to be in series with the external lead antenna? Just a thought as they are backward in alot of spots. T5 for one the 6.6 and 2.4 ohm are reversed with the proper color codes going to the right pins but coil values are backwards.

Just a thought.

I have the PROPER schematic for my set but it does not have coil values written on it. That would explain the improper or what I thought was improper wiring on the antenna at the front which likely caused all of this...

:T3 is not open.. It reads 35 ohms and the 1 ohm coil reads 1.3 ohms. I rewired the front end on this coils. It is still the same. If I ground the 35 ohm tap I get quite good reception. If I take the jumper off I get noting but noise and chirps across the band.
:
:Not sure why..
:
:
:
:
::
::

::
::
::
::
::
::
::
::
::
::
::
::Sir Bubba. . . . .
::
::
::Where we wuz . . . I dun fergitted !
::
::
::A bit of clarification on the procedure of monitoring for the presence of an IF output signal from a MIXER stage . . . or on further down the IF strip, even up to its input into the AM detector stage. . . with its increasing in strength progressively.
::
::
::This being after I surmised the fully perceived semantics of your statement of:
::
::
::
::
:: WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore.
::
::
::
::
::With emphasis on that "RF" being inserted, in addition, to the EXPECTED IF.
::
::
::I am now reading that as your ALSO additionally going frontally to the 7C7 RF stage and clipping on to that plate or 1st grid . . . . now, that is not going to work, as the 456 IF signal does not originate UNTIL the plate of the 7A8 MIXER stage.
::
::
::And then, you can be connected to that MIXER plate OR the first grid of the IF amplifier stage OR the plate of the IF transformer OR the secondary of the 2nd IF transformer .
::
::
::A properly operating receiver under test should let you hear the tuned in station of that receiver being tested, on your small monitoring set via the close capacitive coupling being provided the loop antenna of the monitoring receiver . . . . with it being picked up on 910 Khz as a second harmonic of the basic 455 Khz IF signal presence.
::
::
::
::Now if you were attempting to connect up to the 1st grid or plate circuitry of the 7C7 RF amplifier and expecting any results on the input or output of the frontal RF stage . . . not gonna hoppen .
::
::
::BUT there IS a possibility of the RF present there in the 540---1750 spectrum heterodyning within your monitor receiver and accounting for the "squealies" as you were tuning the Philco across the band.
::
::
::
::Now back to your newest query about the circuitry in the front of the 7C7 RF amplifier stage.
::
::
::I am seeing your mentioning the 35 ohms of the secondary of the RF / Antenna input transformer . . .T3 . . . so it says, but have you actually ohmmed it out ?
::
::
::I am sort of expecting that secondary winding to be open.
::
::
::Here's the way they designed this sets input RF circuitry:
::
::
::In these olden tymes of receivers, the larger built in, back of set loop antenna was not yet fully entrenched.
::
::
::In even older times, they were dependent upon an antenna input coil being wound on sizing upwards up to a 1 inch diameter phenolic form, and being on top of chassis or even worse, shielded away from out of the air RF signal access under the chassis.
::
::
::No problem . . . as you see, they placed a small tickler winding on the transformer to receive the "piped" in stronger RF signal from an outdoor aerials length of wire, and it inductively couples into the T3 input RF transformer .
::
::
::This is what you are seeing as your units ~1 ohm primary winding.
::
::
::The RF input to the 7C7 RF amp is coming in thru that 100 pf capacitor on its 1st grid circuitry, which is tied in to a tunable parallel resonant circuit consisting of the C3 RF variable tuning condenser section and its two alignment assistants C4 + C5.
::
::
::The inductance aspects of the circuitrty is the series aiding arrangement of the secondary of the T3 transformer along with the LOOP and its somewhart more massive area that it provides in picking up out of the air Rf signal.
::
::
::The two series coils are working in conjunction . . . with the T3 secondary providing the brunt of the approximate 240 uh ,needed inductance . . . and the larger area cabinetry LOOP, throwing in its wee amount of additional inductance, but mainly, its enhanced signal picking up capability that its MUCH larger exposed surface area is offering , in the picking up of out of the air RF signal.
::
::
::Now if T3 secondary was open or somehow otherwise not connected, that is leaving your inductive portion of your RF's Inductive and Capacitive resonant tuning circuitry non existant.
::
::
::Now if the TOP side of that T3 secondary coil is shorted across to its bottom ground connection ( or to the frame of the tuning condenser) and the set starts working, that seems that the T3 secondary continuity is not there, with no resonant circuit continuity into the 1st grid of the RF amp.
::
::
::HOWEVER, if you shorted across the unit and then the set started playing . . . to a fashion . . .that would have the sole loop winding inductance TRYING to fill in for the combination of series inductances. Thus being VERY deficient in overall inductance, but picking UP stations due to its larger physical area and better off the air RF exposure to stations, than the miniscule sized little T3.
::
::
::Come back at me with your findings . . . .
::
::
::
::
::
::
::
::
::
::
::73's de Edd
::
::
::

::

::
::
::
::
::
::
::
::
:::What would that cause?
:::
:::
::
:::
:::::
:::::OK I got it working. i have radio...
:::::
:::::I do not understand the following.
:::::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
:::::
:::::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
:::::
:::::Is this suppoes to be a hot chassis like this?
:::::
:::::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
:::::
:::::
:::::
::
:::::
::::::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
::::::
::::::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
::::::
::::::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
::::::
::::::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
::::::
::::::Now any suggestions on what to try?
::::::
::::::THX Bubba
::::::
:::::
::
::::
::::
::::You may have the polarity of the primary or secondary of the replaced IF transformer wrong.
::::Johnnysan-
::::
::::
::::
::::
:::
:::
::
::
:
:

6/23/2011 2:27:50 PMClifton

Bubba,

You do have the blue ( for use with an external antenna) wire connected to chassis? If this wire is not grounded and nothing in the way of an external antenna connected to it can effect the reception quite a bit.

Clifton

6/23/2011 2:28:28 PMClifton

Bubba,

Clifton

6/23/2011 2:58:47 PMBubba

I think I have figured out what is wrong. This schematic I am using is for a different version of the Philco 46-1203.

Mine does not have the choke and it has the 50Y6 rectifier. I was just looking over some other similar schematics that don't have the choke and that rectifier and they have the external antenna connected to the 35 ohm and the loop connected to the 1 ohm on the antenna coil.

This would explain why throughout the radio with stock wiring the coil values are reversed. ALSO just like the 46-xxxx similar schematic I was looking at located in the schematic archive on this site. I am going to try and find the coil values for for the PROPER schematic/version that I have because it is correct but does not show the coil values and I bet I will find I am correct. I need an equipment list so when I get home I will post for what schematic I need it for. I originally had thought that someone wired the antenna up wrong and also thought it was odd because it looked like factory solder joints. but now I am sure that the other version has these values reversed. That is what I get for assuming that ALL 44-1203 schematics are the same.

Bubba.

:Bubba,
:
:You do have the blue ( for use with an external antenna) wire connected to chassis? If this wire is not grounded and nothing in the way of an external antenna connected to it can effect the reception quite a bit.
:
:Clifton
:
:
::
::OK I got it working. i have radio...
::
::I do not understand the following.
::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
::
::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
::
::Is this suppoes to be a hot chassis like this?
::
::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
::
::
::
::
::
:::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
:::
:::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
:::
:::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
:::
:::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
:::
:::Now any suggestions on what to try?
:::
:::THX Bubba
:::
::
::
:
:

6/23/2011 3:40:29 PMBubba

I believe my antenna scheme is like this upon original design and that there is nothing now wrong with my Radio. The swap in the lower coil 6.6ohm and 2.3ohm values is the same also on this schematic.. It's wierd that Philco did this,, somtimes using the 36 for the external and 1.x for the coil and vice versa on a very similar model..

http://www.nostalgiaair.org/PagesByModel/584/M0013584.pdf

:I think I have figured out what is wrong. This schematic I am using is for a different version of the Philco 46-1203.
:
:Mine does not have the choke and it has the 50Y6 rectifier. I was just looking over some other similar schematics that don't have the choke and that rectifier and they have the external antenna connected to the 35 ohm and the loop connected to the 1 ohm on the antenna coil.
:
:This would explain why throughout the radio with stock wiring the coil values are reversed. ALSO just like the 46-xxxx similar schematic I was looking at located in the schematic archive on this site. I am going to try and find the coil values for for the PROPER schematic/version that I have because it is correct but does not show the coil values and I bet I will find I am correct. I need an equipment list so when I get home I will post for what schematic I need it for. I originally had thought that someone wired the antenna up wrong and also thought it was odd because it looked like factory solder joints. but now I am sure that the other version has these values reversed. That is what I get for assuming that ALL 44-1203 schematics are the same.
:
:Bubba.
:
:
:
:
::Bubba,
::
::You do have the blue ( for use with an external antenna) wire connected to chassis? If this wire is not grounded and nothing in the way of an external antenna connected to it can effect the reception quite a bit.
::
::Clifton
::
::
:::
:::OK I got it working. i have radio...
:::
:::I do not understand the following.
:::In the schematic it has the loop antenna going from the tuner through the 2 ohm loop then to a 35 ohm coil and to chassis ground. I can only get reception when I short the 35 ohm coil to chassis ground.
:::
:::The other 2 things I noticed is the chassis measures 120VAC to safety ground and 100VDC to safety ground with the plug either polarity..
:::
:::Is this suppoes to be a hot chassis like this?
:::
:::Anyway I have stations now but only when I short that 35 ohm to the chassis. I do not understand why this is?
:::
:::
:::
:::
:::
::::OK so I started a new post for my Philco because I cannot figure it out and need help with this one.
::::
::::All the DC voltages measure right. I replaced the 2nd IF output transformer and Plate voltage etc measures right.
::::
::::As well, Radio powers up and I can hear hiss out the speakers. The only thing when I sweep the dial is it chirps many places across the dial. But no Radio..
::::
::::Where to look. WHen I wrap a piece of wire around another radio set at 910KHZ and move the jumper from stage to stage on the RF/IF I do not get anything anymore. Also just chirps across the dial. I am not giving up on this until I fix it. The Radio is a pice of garbage as far as I am cincerned but I cannot let it beat me.
::::
::::Now any suggestions on what to try?
::::
::::THX Bubba
::::
:::
:::
::
::
:
: