Total posts : 45366
it’s full of adjustments and built like a tank. uses very high tolerance components. for those who know what they are doing it can be adjusted to part 73 spec’s using the internal adjustment VR’s. it has adjustments for null, symetry, modulation, etc. it’s built like a commercial exciter puts out 1mW into 50 ohms is spectrally excellent. the stereo generator is a standard TTL switching stereo encoder similar to the North Country MPX96. the RF section uses a custom programmed atmel chip and PROM chip for frequency generation. everything else is stanadard off the shelf parts and standard RF stange configuration, oscillator, Modulation, IPA, PA stages, followed by a 4 pole LPF. it has a 35″ collapsable whip. it uses the case for ground and the whip for hot. it’s a 50 ohm output of exciter but the antenna system is not quite 50 ohms which loads down the final RF stage thus dropping down that 1mW as evidenced by the very short range. turning it up to 1mW got me out about 75 ft on 88.9 with transmit whip antenna fully extended to 35 inches to a portable grundig radio with the receiving whip antenna collapsed. i’m sure with the grundigs whip fully extended i would get out to about 100ft. from a design stand point it is very well built. from a range standpoint it meets part 15 even on the high setting or at least mine does and range could be much better. in all fairness i am comparing it to my broadcast vision transmitter and i have a very far off co channel station causing me interference but the only absolutely clear frequency here is being used by a very local (next complex over) 1 watt FM pirate
it would be interesting to see what it will do into a 1/2 wave dipole fed with low loss lmr400.