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i normally get 25ish from an HG final. I modded/recapped a 21xlr which is now happily being used in a semi running the eastern seaboard, dimmer knob repurposed into the DK control, and it pushes 27w pep. limiter is intact but modded to have a bigger threshold. I'm curious what he used for a FET...

the tip41....its still a to-220 device. i have on hand an NTE270 which is a to-3. IF i were to un-volt the final, my instincts say a bigger package NPN upstream from the driver-final would be better no?

i have a 200mhz china scope. everything looks good there. the volted final takes a lot of heat from the regulator and everything runs cooler so im gonna stick with that, but i'll try the diff cap and resistor.

comparing off the washington/142gtl method i saw on another forum with my own notes: 1. Remove TR32 [ACTUALLY DONT DO THAT. TRY CHANGING R104 to 22K TO OPEN UP THE THRESHOLD CLEANLY] 2. jumper r123 3. Add a 10 uF 25 or higher volt electrolytic cap to the following spots: Attach the positive...

looking to drop the carrier down. for the amp. how is the best way to go about this? i see a couple of methods mainly in certain forums but unsure about which one is best

yeah, i never had one that was this restricted. usually can pull it back to about 2W and it screams

I wanna thank you again Andy. I just aquired yet another PC122 which was dead in the modj swing but what I am observing is a 5-6w PEP with the carrier at around 2-3w and it jumped up to 16 pep if i set the carrier pot at 8w which i know isn't something that can fly thermally speaking. much of...

that things gonna splatter wicked hard. no limiter and a class C amp

Also, in order to properly kick an amp, r134 is going to be the resistor I pull for the tap points for a tip120 NPC mod.

Getting about 9w peak from this after a recap. This radio is going in a 70s era Ford van that's currently getting restored. It has a home. The limiter is an ancient design and I don't exactly want to snip it. Did get more audio by changing r131 to 1.8k but any more and audio warbled. My guess is...

By the way I have two more 40 channel chassis radios to recap with the same internals made by RCA and GE so any knowledge I pull out of this will be applied to Future recaps. And just this last week I brought a bunch of 23 channel radios back to life including a cobra 26 so I've been busy my...

This radio was very good looking cosmetically but was in my fix pile because it didn't have any modulation and real muddy audio so 90% of the problem was solved with a electrolytic recap. The radio is kicking a good solid 18 with a stock final and I did the NPC mod. So my transmit audio has no...

Revisited for a few minutes. On both rigs that I have here I got the squeak to stop on channel 19 but it squeaked on the outer edges about 10 channels into either side so I need to figure out how to broadband the vco so I could cover the entire extra channels range without that happening

I am using RG 188 mil spec Teflon coax that can handle somewhere around 1k and I tacked a 50 ohm resistor on that and tested the main run of it that I have and the antenna analyzer is reading perfect so that's not the issue. Pass through readings on my cheap Chinese antenna analyzer reading...

So I was only able to get 250 off the top of this thing, and I found that there is an internal mismatch with the relay. Tried using caps to tune it out but I think there is just too much power loss in and out there. It's a pretty heavy duty relay

Yeah I just went through and tested all the transistors. All of them tested good. It's definitely a tuning issue somewhere

Oh, and I used new 9530s Usually on my cheap mfj meter RMS power is about a quarter of the peak almost every system and despite only reading 200 on the top end my RMS power is going up to about 90. Normally that would only be around 50 RMS

Not getting the power output I should be out of this only around 200, I have a 100 w single mosfet driver amp that I already built and works like a champ and anything above 60 makes the audio crunch and I'm only getting around 200 off the top. I got the input match good and messing with caps I...