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The Best of Both Worlds..?
I have a thought.. 💡 Could a low powered FM xmtr (Part-15) be used to transmit audio to a Part-15 AM xmtr?
Let’s say that the AM xmtr is… 50′ away from the studio area. Send the programming to a Part-15 FM xmtr. At the AM xmtr, have an FM receiver to receive a selected frequency and balance the output so the xmtr can use it. Is this possible? Has anyone tried it? Would the AM xmtr desense the FM rcvr?
Total posts : 45366Absolutely. The nice thing is, that you already have that pesky pre-emphasis issue resolved as the FM xmtr will apply it and the FM receiver will process it.
Also, you’re going the right direction as far as bandwidth and fidelity go – source to link to FM xmtr to AM xmtr, each degrading the audio a bit, but each step going into a form that needs less bandwidth and fidelity each time.
Can’t wait to hear more about it. 😀
Total posts : 45366thats a really good idea.. im dying to know how that goes.. 🙂
Total posts : 45366Well, Guys.. I played around with this idea some and I believe it will work great! I connected an fm radio..(Walkman) to the xmtr inside of the radiation pattern and it don’t touch it a bit! The walkman operated just fine and had no desense at all. I tuned the walkman to a few more distant channels with no problem. I thinks we may have something here.. 😉
Total posts : 45366Ooooooooooooooooooo 🙂 Document that puppy 😀
Total posts : 45366I mounted the SSTRAN and an F.M. pocket radio (mono) in a weatherproof box at the base of the antenna. I use a Velleman kit F.M. xmtr to get sound to the SSTRAN. I had the most trouble with getting the Velleman to sound good. After that, everything was fine..
I find that the A.M. doesn’t bother the F.M. at all! Actually, the highs are better than going through cables. Much cleaner! The bass response is great! Holds togather very well! The compression on the SSTRAN is touchy but once it’s set, it almost sounds as good as the F.M. direct. I could adjust the antenna better without the audio cables running up there. I got a better (higher) voltage easier without them. Everytime I connected the audio cables to the SSTRAN with the V.O.M. on the test points, the voltage would drop 2 volts. Now the only cable going up there is power. I can get a great peak as high as 15 volts. I couldn’t do that before. Also I believe that some of the R.F. from the SSTRAN was going down the audio lines to my mixer making it sound somewhat “Softer” than it is now. Much less background noise also..
I operate the SSTRAN and the pocket radio from a 24 volt D.C. supply. I decided to convert the 12 volts to 24 volts in the house and send it up to the top because of less loses through the wiring. I have around 26 V.D.C. at the xmtr and connected that directly to the xmtr. I used a 7805 regulator to operate the pocket radio. I contacted SSTRAN about this and Phil said it would be ok but approaching the high limit of the 15 volt on board regulator. I let it run for 3 days constant with no issues..
Total posts : 45366I would also think my help reduce the problems associated with static discharge and lightning. If your source audio is a PC, then you reduce the risk of introducing lightning into your PC since it’s not connected at all to the “lightning rod” outside the house.
I think I might try this when I set up my station.
Regards,
Scott
Omaha, NE
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