The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

I have a palomar elite 450hd amp that had a resistor burnt to badly to identify. I cant find any schematic on this thing. Does anyone know what the value of R19 in this amp.

thanks,

Mike

Mike,
Can you give a little more info as to the location of the resistor in the amp, as someone may be able to help you.

I replaced the part with a resistor already as seen in the pic i attached. R19 is beside the keying relay. when i key up but on med and high power it stays keyed after you unkey the transmitter. I dont think this is the main cause of this but i would like to get this part back to OEM. The amp seems to be self oscillating on high and med power on an antenna. It dosnt do this on a dummy load. I have tried it on my bench antenna and the customers. Any thoughts or suggestions??

thank you,

Mike

I've had the same problem many times, sometimes I fix them and sometimes I don't.
Try changing the relay switching transistor and the two IN4148 rectifying diodes to the base of the same transistor, it works for me now and again but not always.
Dave.

Thanks, I will give that a try and see what happens.

MIke