Am I correct in assuming that unit being the ROYAL 7000Y1 series of Transoceanic...all solid-imuffied state-icized ?
And BTW..what are you doing with that S/S unit, vice some olden tube unit...What did you do....find it on the $200 table at
a yard sale ??
FIRST thing would be to see that you DO NOT have the Beat Frequency Oscillator turned on, as that would be reeeealll whistley type of reception with adjunct birdies unless you are tuned dead on center frequency and even then,it that would not sound really good !
BFO control and switch is the top one of the four lined up on the left side, just below the dial scale.
If correct on its numbering and type, lets do an initial circuit evaluation:
The unit is using a common shared audio amp for your FM section /Weather band AND your AM portion of the
radio. So, we should not suspect that section being at fault.I can see that there is one portion of a voltage regulator
circuit that feeds the AM section and there is one electrolytic capacitor involved exclusively with the AM
function. Finally, the last suspect item being the detector diode for the AM portion.
Starting with the easiest, track down that TR-13 #121-701 voltage transistor and check its emitter for ~5.7 VDC.
I have placed that section in a violet mark-up box with and orange xstr on the provided schematic.
Check over to the northwast of the regulator and find the electrolytic..green boxed....would be nice if all that
your problem is was that cap, and if it is a black cased Nashville brand of unit , that might be it.
The last item of suspect...and the hardest access... would be the AM detector diode which is squirreled away inside
the case of the AM final IF and detector transformer T14...the diode is red box marked on the schema. That diode will
be a germanium 1N34 or 1N60 type, which could be obtained locally at Radiuus Shackamus should you not already have one
from a xtal set project or an old AM pocket transistor radios detector diode.
The additional relevant schema mark ups are:
Yellow for your audio circutry, Which should be declared OK due to your FM reproduction being OK.
The detected FM audio path from the top...with green line markup...going down to your audio function selector switch.
The orange line is the AM detected audio flow path to the aforementioned switch.
The fuscia line is the selected audio source that is finally fed into the audio amp.
Lastly ,if you end up pulling the T14 tranfo to pull it apart for diode changeout..its physical location is shown at
extreme bottom right corner of the whole schematic.
The 7000 Referencing schematic: ..............And place your reading spectacles to the side !
73's de Edd
:On BC bands this radio has lousy reception and audio. Once I get a station to sound off, I still need to tweak it. FM is fine, and tunes left to right. What do to?
:
:
:
:
:Am I correct in assuming that unit being the ROYAL 7000Y1 series of Transoceanic...all solid-imuffied state-icized ?
:
:And BTW..what are you doing with that S/S unit, vice some olden tube unit...What did you do....find it on the $200 table at
:a yard sale ??
:
:FIRST thing would be to see that you DO NOT have the Beat Frequency Oscillator turned on, as that would be reeeealll whistley type of reception with adjunct birdies unless you are tuned dead on center frequency and even then,it that would not sound really good !
:BFO control and switch is the top one of the four lined up on the left side, just below the dial scale.
:If correct on its numbering and type, lets do an initial circuit evaluation:
:
:The unit is using a common shared audio amp for your FM section /Weather band AND your AM portion of the
:radio. So, we should not suspect that section being at fault.I can see that there is one portion of a voltage regulator
:circuit that feeds the AM section and there is one electrolytic capacitor involved exclusively with the AM
:function. Finally, the last suspect item being the detector diode for the AM portion.
:
:
:Starting with the easiest, track down that TR-13 #121-701 voltage transistor and check its emitter for ~5.7 VDC.
:
:I have placed that section in a violet mark-up box with and orange xstr on the provided schematic.
:
:Check over to the northwast of the regulator and find the electrolytic..green boxed....would be nice if all that
:your problem is was that cap, and if it is a black cased Nashville brand of unit , that might be it.
:
:The last item of suspect...and the hardest access... would be the AM detector diode which is squirreled away inside
:the case of the AM final IF and detector transformer T14...the diode is red box marked on the schema. That diode will
:be a germanium 1N34 or 1N60 type, which could be obtained locally at Radiuus Shackamus should you not already have one
:from a xtal set project or an old AM pocket transistor radios detector diode.
:
:The additional relevant schema mark ups are:
:
:
:Yellow for your audio circutry, Which should be declared OK due to your FM reproduction being OK.
:
:The detected FM audio path from the top...with green line markup...going down to your audio function selector switch.
:
:The orange line is the AM detected audio flow path to the aforementioned switch.
:The fuscia line is the selected audio source that is finally fed into the audio amp.
:Lastly ,if you end up pulling the T14 tranfo to pull it apart for diode changeout..its physical location is shown at
:extreme bottom right corner of the whole schematic.
:
:
:The 7000 Referencing schematic: ..............And place your reading spectacles to the side !
:
:73's de Edd
:
:
:
:
:
:
:
::On BC bands this radio has lousy reception and audio. Once I get a station to sound off, I still need to tweak it. FM is fine, and tunes left to right. What do to?
Well I guess the very first part mentioned was on the sets Beat Frequency Oscillator or probably abbreviated on the radios
markings as being...BFO.
Its having being turned on would have been the simplest reason for the creating of that critical tuning situation. Its purpose
is for injecting in an RF carrier to enable you to be able to receive Single Side Band ..aka..SSB signals and have them
not otherwise sound like garbled Donald Duck talk.
SSB transmission mode is used primarily by ham radio and the military communications.
If you initially had it turned on, along with you not even having the foggiest idea as what it was for, and in your
“tweaking” in the tuning and not realized its function, you might have turned it off, with audio quality being enhanced
after that action.
Its for sure that if you were to turn it on again, and then try tuning in slowly to an AM station, there would be a
whistle initially being developed.... and then a progressive shifting downwards in its frequency as tuning onto the station is
optimized.... until there is eventually a very-very low tone and then the frequency shifts upwards in frequency ( the
reverse of the prior situation) as you shift tuning off the received frequency in the other direction.
At any rate, you GOT alot of freebie extra info here about that receiver, along with its power supply and AF output circuitry's
schmatic, so electronically file it and hold, should that info / schema ever be needed in the future
Further SSB reading refs:
A
B
73's de Edd
:Thanks to Edd. I was lucky: all I needed to do was monkey with it a bit more with the knobs and it is just fine. Edd, you surely tried to send me a lot of info to find the problem. Thank you. (I did not understand the first part of your answer)
:
:
:
::
::
::
::
::Am I correct in assuming that unit being the ROYAL 7000Y1 series of Transoceanic...all solid-imuffied state-icized ?
::
::And BTW..what are you doing with that S/S unit, vice some olden tube unit...What did you do....find it on the $200 table at
::a yard sale ??
::
::FIRST thing would be to see that you DO NOT have the Beat Frequency Oscillator turned on, as that would be reeeealll whistley type of reception with adjunct birdies unless you are tuned dead on center frequency and even then,it that would not sound really good !
::BFO control and switch is the top one of the four lined up on the left side, just below the dial scale.
::If correct on its numbering and type, lets do an initial circuit evaluation:
::
::The unit is using a common shared audio amp for your FM section /Weather band AND your AM portion of the
::radio. So, we should not suspect that section being at fault.I can see that there is one portion of a voltage regulator
::circuit that feeds the AM section and there is one electrolytic capacitor involved exclusively with the AM
::function. Finally, the last suspect item being the detector diode for the AM portion.
::
::
::Starting with the easiest, track down that TR-13 #121-701 voltage transistor and check its emitter for ~5.7 VDC.
::
::I have placed that section in a violet mark-up box with and orange xstr on the provided schematic.
::
::Check over to the northwast of the regulator and find the electrolytic..green boxed....would be nice if all that
::your problem is was that cap, and if it is a black cased Nashville brand of unit , that might be it.
::
::The last item of suspect...and the hardest access... would be the AM detector diode which is squirreled away inside
::the case of the AM final IF and detector transformer T14...the diode is red box marked on the schema. That diode will
::be a germanium 1N34 or 1N60 type, which could be obtained locally at Radiuus Shackamus should you not already have one
::from a xtal set project or an old AM pocket transistor radios detector diode.
::
::The additional relevant schema mark ups are:
::
::
::Yellow for your audio circutry, Which should be declared OK due to your FM reproduction being OK.
::
::The detected FM audio path from the top...with green line markup...going down to your audio function selector switch.
::
::The orange line is the AM detected audio flow path to the aforementioned switch.
::The fuscia line is the selected audio source that is finally fed into the audio amp.
::Lastly ,if you end up pulling the T14 tranfo to pull it apart for diode changeout..its physical location is shown at
::extreme bottom right corner of the whole schematic.
::
::
::The 7000 Referencing schematic: ..............And place your reading spectacles to the side !
::
::73's de Edd
::
::
::
::
::
::
::
:::On BC bands this radio has lousy reception and audio. Once I get a station to sound off, I still need to tweak it. FM is fine, and tunes left to right. What do to?