Magnum Delta Force low am modulation and swing

[528kasanoba]

I just bought a Magnum Delta Force on ebay and when i installed the radio it key up about 8watts but had no forward swing. Also on reports to locals they would state that the modulation was to low. I installed a Diode 1n4001 swing kit and it has a swing. I adjusted the RF power to go down to 1 watt with that it swings to 10 watts but when I go all the way on the RF which is 6 watts it only swings to 10 watts. The finals are in good working order although the 2sb778 heats up pretty good that is the DC to DC converter Audio amplifier. My question is could the 2sb778 audio amplifier be bad?

also with out the diode swing kit the radio will have very low modulation and the 2sb778 would heat up tremendous the same way finals do with bad SWR.

This is the first time I have own such equipment and was wondering if any one out there can shed some light to this. This radio has the dual sc1969 finals driven by 1 sc2166 so the radio is capable of doing the 30watts.


Can anyone help me please?

Thanks!

Best regards, 528Kasanoba


10-4 on the 10-4 on the 10-4!!!!!

 

[johnecashflo]

im not sure how you can tell if a final is good or bad unless you have a transistor tester..anyway i recently had a magnum S3 that did the same thing as you are describing it was one of the finals the driver was the only thing working..replaced BOTH finals ...CAN YOU HEAR ME NOW.. THE RADIO ROCKS....

 

[9C1Driver]

Off hand you might get with Bob's cb or Rolling Radio's cb, as I recall both those places are good with Magnum radio's.

 

[Moleculo]

What meter are you using to test the power output?