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

Hi all I picked up a "Silver Bullet Modulator" at a flea market this weekend. Looks to be a 1 pill amp (MRF455). 3 switches on the front. on/pwr, on/rec, hi/low as well as 3 leds (pwr/rec/tx). Anyone have any idea who made this? No marking inside but I did find a capacitor that had broken ...

All it took was a drive to a shop and they tuned it and replaced a few parts. Tried a test with my son driving until out of range. We got almost 8 miles. Last time we got 7 and he couldn't hear me. Last time I only heard him for the 1st mile. Long story short... you can't tell with used and unless y...

The 2SC1674 is the same as 2SC1674L. You can check the AGC voltage at the Anode for D13 it should be about 4.8 to 5.8vdc with no signal and 1.5 to 2.0vdc and S9. To see if ot is a AGC fault clamp the AGC line to 4.0vdc but do not transmit while the AGC is clamped. Rick. I looked on cbtricks and don...

I would just replace Q14, you can not test for low gain with a mutilmeter, also check the AGC voltage. The common fault is front end fault I wish I had a pound for ever one I have fixed. Rick. I'll make the long drive to Toronto to a parts supplier tomorrow and grab a replacement. They list a 2SC16...

Farley common fault with this radio, check D12 and D13 you will probably find one the diodes open circuit if so replace and also replace Q14 (2SC1674L) has it will have gone low gain. You will need to retune L4 to L10 Rick. Hi Rick I checked both diodes and they seem ok (work one way, nothing with ...

Hi all Just picked up an XL from ebay. Transmit is great. Reception isn't. Swapped in 2 other units and I hear all kinds of distant chatter. Had my son drive from the house as a test and he heard me about 7 miles away. I lost him after 1. Plugged in a spare unit and I can hear. I think L4/L5 are the...