We have a SSTRAN AMT3000 transmitter for a backup transmitter but having difficulties with tuning and broadcast range.
We built the SSTRAN AMT transmitter and the base loaded antenna as described on thier web site. The transmitter works fine, sound quality, fidelity are good, however, tuning the transmitter with the base loaded antenna per the antenna instructions and with the multi-meter plugged into T1 & T2 the best reading we get is 6.5 volts DC. The instructions state that the voltage reading should be 13 volts DC for perfect tuning of the transmitter to the antenna. In this condition the broadcast range is only about 300 feet. (we’re looking for 1 mile plus)
Checked all the transistors for voltage against the circuit diagram and they did not seem to be off by much but we changed out all of them; 2N2222 , 2N3906 (Q1, Q2, Q3, Q4 & Q5) as well as fixed resistor 1k ohms (R31), still getting only 6.5 volts when tuning.
Would appreciate any thoughts on possible solutions to these problems.
Biff