SignalGuy

I’ve been able to spend a little time reading and downloading Part 15 related music and info these past few weeks, as well as upgrading the audio and file management. I finally have figured out that despite the presence of what looks like an external antenna jack on the Sainsonic, it was meant only for the stock whip! I’d previously thought the reverse threads were some oversight on my part. It had been easy to get the adapter to fit despite it, by using a file on the threads.

Anyhow, the external antenna and attenuator are history, stock whip back in place, filed threads did not hurt the fit, low power setting engaged, and, coverage is now only about 125′ instead of the solid 200′ I had set up for.

I’d thought about building an attenuator into the transmitter shell, but, I think it’s time to set up for a move to the A.M. band anyhow. 1700 KHz is open here. And I have ideas for a poor man’s synchronized transmitter setup.

I saw the comments in the news this week about the FCC moving to make it even easier for A.M. stations to put up translators on F.M. It’s probably too much to ask that 106.5 in Souderton / Telford will remain unoccupied for much longer, though I know of no such pending action.
I also followed a link to the FCC enforcement actions page. I found it interesting that almost ALL recent FCC enforcement is related to F.M. I didn’t even see ONE A.M. enforcement action!

I’m thinking of using a “spitfire” transmitter, modified to act as a synchronizing oscillator / exiter, to feed a pair of closed cables, connecting to the oscillator stages of a pair of free running Ramsey transmitters I have. I should be able to inject a signal into the free running Ramsey oscillators and get them to “lock” on to the synchronizing signal. I did something very similar, with regenerative receiver circuits, back in the day. I was able to use a crystal oscillator to force the regenerative detector to “lock”, and, could copy CW, SSB, etc, with no drift.

I plan for the audio to be routed to the Ramseys by seperate audio cables, taken together with eack one having it’s own osclillator, thereby maintaining their identity as seperate transmitters, each with 100 MW into an integral antenna. The spitfire would just be creating the R.F. needed to synch the two carriers. One transmitter would be in the southeast window, the second would be in the northwest window. I’ll be happy to create about a 300′ radius coverage. maybe a tad more with a car radio.

Considering the ten square mile coverage that part 15 operator WNAR in Lansdale is getting, I think my goal may be realistic.
Time will tell!