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  Identifying NASA-used Motorola FM receiver

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Author Topic:   Identifying NASA-used Motorola FM receiver
nasanut
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posted 02-05-2010 09:48 AM     Click Here to See the Profile for nasanut   Click Here to Email nasanut     Edit/Delete Message   Reply w/Quote
I just got an FM receiver and it is big. It was made for NASA and came from NASA. It has a small tag on front panel that says 2272.5 CM FM.

It's made for video reception the big ATT control on the front is made by Arra and I contacted them and their control was made in 1965. The 2272.5 Mc was and is a NASA freq used during Apollo and other missions.

The tag from Motorola only reads FM receiver, no model number just a part number. So far, Motorola hasn't contacted me back with any info.

Could the 2272.5 CM FM tag mean command module FM?

stsmithva
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posted 02-05-2010 10:48 AM     Click Here to See the Profile for stsmithva   Click Here to Email stsmithva     Edit/Delete Message   Reply w/Quote
There are several cS members whose knowledge of Apollo hardware is extraordinary, and perhaps they'll have more to add. I just browsed around a little online and found this from a 1966 Manned Flight Support Office report on the Apollo Unified S-Band System. It mentions the 2272.5 Mc frequency. (It's a PDF document, but here is the link to the HTML version.)

Figure 10 lists the S-band frequencies that are available from the trans-ponders on the CM, LEM, and Saturn S-IVB. The CM PM carrier is approximately 2287.5 Mc , being a function of the uplink PM carrier. As mentioned earlier, the uplink carrier is multiplied by a factor of 240/221 to produce the downlink carrier. Since the two-way Doppler frequency can be as high as 120kc, the nominal 2287.5 Mc vary by k120 kc. The FM carrier is generated in the spacecraft and its nominal frequency is 2272.5 Mc. These two (2) carrier scan be transmitted simultaneously or separately depending upon the mode of operation. In general, television is not a requirement until the lunar phase,thus, two (2) links from the CM could be expected at lunar distances.

nasanut
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posted 02-05-2010 12:39 PM     Click Here to See the Profile for nasanut   Click Here to Email nasanut     Edit/Delete Message   Reply w/Quote
Thanks for the link, nice info. I found some other stuff yesterday about the S-band but not much info on ground equipment. Most was Apollo command module stuff. This receiver has no model number just a Motorola part number and serial number 3. All sections are plug-in modules very nicely made. Just have to repair tuning meter, big rack mount.

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