Edward
Here is some information about the 45Mhz, old FM band:
http://www.geocities.com/wa2ise/radios/fm45.html
Might find some TV sound but that's about it at least in my area.
Norm
:Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
:
:Edward
:Hi Edward
:
: Here is some information about the 45Mhz, old FM band:
:
:http://www.geocities.com/wa2ise/radios/fm45.html
:
: Might find some TV sound but that's about it at least in my area.
:
:Norm
:
::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
::
::Edward
In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
Lewis L.
When I tune in channel 1 on my television, I don't get anything. I did align it a long time ago, but it might not be in alignment. The RCA 630TS chassis is really picky with tuning, so who knows.
Thoma
Do you recall any details about that box you found on the web so I can try a stab at it myself? I would be interested in that box.
Edward
::Well Norm there is a web site for everything, thanks again.
::
:::Hi Edward
:::
::: Here is some information about the 45Mhz, old FM band:
:::
:::http://www.geocities.com/wa2ise/radios/fm45.html
:::
::: Might find some TV sound but that's about it at least in my area.
:::
:::Norm
:::
::::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
::::
::::Edward
:
:In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
:
:Lewis L.
:Lewis,
:
:Do you recall any details about that box you found on the web so I can try a stab at it myself? I would be interested in that box.
:
:Edward
:
:::Well Norm there is a web site for everything, thanks again.
:::
::::Hi Edward
::::
:::: Here is some information about the 45Mhz, old FM band:
::::
::::http://www.geocities.com/wa2ise/radios/fm45.html
::::
:::: Might find some TV sound but that's about it at least in my area.
::::
::::Norm
::::
:::::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
:::::
:::::Edward
::
::In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
::
::Lewis L.
:Edward: The box's technical description is a downconverter - it moves the modern 88-MHz FM down to your set's band. Heres the dope: http://www.somerset.net/arm/fm_only_converters.html
:Doug
:
::Lewis,
::
::Do you recall any details about that box you found on the web so I can try a stab at it myself? I would be interested in that box.
::
::Edward
::
::::Well Norm there is a web site for everything, thanks again.
::::
:::::Hi Edward
:::::
::::: Here is some information about the 45Mhz, old FM band:
:::::
:::::http://www.geocities.com/wa2ise/radios/fm45.html
:::::
::::: Might find some TV sound but that's about it at least in my area.
:::::
:::::Norm
:::::
::::::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
::::::
::::::Edward
:::
:::In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
:::
:::Lewis L.
I was interested in building this from the schematic on that web page. This is awesome and I am going to get on it right away. The parts look common and I figure it can be tucked away in the chassis somewhere. Thanks everyone I have had an education.
The background is I picked up a Pilot Radio T-301 1941 and it is one of the early models to have FM, albeit, FM1. The radio was bought at a flea market and was told it did work and then didn't. As it turns out the principle problem is the AC line cord was open. It was good luck because I have way too many projects and this radio, after recapping, sounds great with good reception, at least on AM. I look forward to getting to to play FM again thanks to the gentlemen on this forum.
: Doug, I saw that converter in a solid state form that could be tucked in to the cabinet and convert the new freq (88-108) to the old 42Mc band. I sent away for the parts and was going to start assembly when it finally dawned on me that my Philco 37-650 doesn't have an FM band! If your interested, I have all the parts with instructions that you can have. It operates on a 9V batt and goes between ant and set.
: PL
:
:
:
::Edward: The box's technical description is a downconverter - it moves the modern 88-MHz FM down to your set's band. Heres the dope: http://www.somerset.net/arm/fm_only_converters.html
::Doug
::
:::Lewis,
:::
:::Do you recall any details about that box you found on the web so I can try a stab at it myself? I would be interested in that box.
:::
:::Edward
:::
:::::Well Norm there is a web site for everything, thanks again.
:::::
::::::Hi Edward
::::::
:::::: Here is some information about the 45Mhz, old FM band:
::::::
::::::http://www.geocities.com/wa2ise/radios/fm45.html
::::::
:::::: Might find some TV sound but that's about it at least in my area.
::::::
::::::Norm
::::::
:::::::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
:::::::
:::::::Edward
::::
::::In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
::::
::::Lewis L.
:Planigan,
:
:I was interested in building this from the schematic on that web page. This is awesome and I am going to get on it right away. The parts look common and I figure it can be tucked away in the chassis somewhere. Thanks everyone I have had an education.
:
:The background is I picked up a Pilot Radio T-301 1941 and it is one of the early models to have FM, albeit, FM1. The radio was bought at a flea market and was told it did work and then didn't. As it turns out the principle problem is the AC line cord was open. It was good luck because I have way too many projects and this radio, after recapping, sounds great with good reception, at least on AM. I look forward to getting to to play FM again thanks to the gentlemen on this forum.
:
:: Doug, I saw that converter in a solid state form that could be tucked in to the cabinet and convert the new freq (88-108) to the old 42Mc band. I sent away for the parts and was going to start assembly when it finally dawned on me that my Philco 37-650 doesn't have an FM band! If your interested, I have all the parts with instructions that you can have. It operates on a 9V batt and goes between ant and set.
:: PL
::
::
::
:::Edward: The box's technical description is a downconverter - it moves the modern 88-MHz FM down to your set's band. Heres the dope: http://www.somerset.net/arm/fm_only_converters.html
:::Doug
:::
::::Lewis,
::::
::::Do you recall any details about that box you found on the web so I can try a stab at it myself? I would be interested in that box.
::::
::::Edward
::::
::::::Well Norm there is a web site for everything, thanks again.
::::::
:::::::Hi Edward
:::::::
::::::: Here is some information about the 45Mhz, old FM band:
:::::::
:::::::http://www.geocities.com/wa2ise/radios/fm45.html
:::::::
::::::: Might find some TV sound but that's about it at least in my area.
:::::::
:::::::Norm
:::::::
::::::::Just a quick question. What is FM1 and what is it good for today? I guess it is pretty useless today.
::::::::
::::::::Edward
:::::
:::::In my roamings around the intentet, I have seen a box that converts the FM of today (FM2?) to the frequencies of yesteryear. I think this thing goes in the radio, but now on a permanant basis. I don't know what the deviation was for FM1, I know its +/- 75 KHz for today's FM (+/-25 for TV). There was some big screw up in assigning frequencies in those days, therefore, there is no channel 1, there is an aircraft marker beacon frequency of 75 MHz between two TV channels. We had a problem with the FCC assigning a ground station for a sattelite company a frequency close to the center frequency of our radio altimeters, which sweep back and forth around 6 GHz to mix with the transmitted signal and produce an audio tone that gets lower in pitch as the airplane approaches the ground. We had an airplane landing about every sixty seconds at Atlanta, so this company was in a real dither, I retired from the avionics business before I ever found out what the outcome was, but our system was used by just about every airliner in the world, so I guess the ground station had to change the frequency of their sattelite or move the ground station. This just goes to show that the people who run things are not perfect.
:::::
:::::Lewis L.
Edward:
Try this link:
http://www.somerset.net/arm/fm_only.html
There are several converters on this site, you might even get a post WW II design to *really* be authentic.
Lewis
P. S. The old band was 8 megacycles (well that's what we called them in those days) wide, while the new is twenty, so there has to be some fairly easy way to shift the converter oscillator to cover the wider band. Here in the Atlanta area, it's very difficult to find an empty channel for a wireless mike or something like that that uses a spare FM channel. People that live in normal cities might have all their FM stations within an 8 MHZ (that's what we call 'em nowadays) band, no way around Atlanta. Play some hip-hop or rap through your 1938 radio, see if it knows what to do with that!!
Lewis