I'm thinking that I might just have a bad crystal, but have no way to prove it. The crystal does have the Hamtronics crystal oven on it, but I don't think that should be the problem.
My opinion right now is that the TA51 6 meter version is just not a good design and probably should be pulled from the Hamtronics products. The specifications on the website state that the transmitter can do +-5Khz of deviation, but the instructions say that it cannot. The 6 meter repeater that they now sell uses a different synthesized transmitter. 73, Joe, K1ike Kevin Custer wrote: > > Joe wrote: > >> The distortion is acceptable at 2.5Khz deviation, but not at 3Khz. I >> have had the 144Mhz and 220Mhz versions of this board and never had this >> problem. > > As you said earlier Joe, it's the multiplication factor that is > killing you, with this type of phase modulator. > > I have never tried my FM modification on a 6M TA-51. I do however use > it on UHF where the FM modulator replaces the phase modulator > totally. I know I advertise that my FM mod is only for PL generation > , but if driven from a good clipper/filter, like the AP-50, you can > use it on the entire voice/pl range. > > It may be difficult to FM a crystal far enough to get 5K of totally > undistorted audio from a Hamtronics 6M TA-51, but I'd try it..... Use > a good varactor. > > http://www.repeater-builder.com/hamtronics/ta-51pl_mod.html > http://www.repeater-builder.com/products/ap-50.html > > Kevin >
