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  1. Uncle Ronnie 336

    i think i just bricked a 29gtl

    ffffff. so i just put a new choke, power connector etc on my 29, extensive work incl a rfx has already been done. goofed up and there was a solder bridge, from the pad that recieves the power from the harness to the positive pin of the PA jack. now the modulation transformer gets hot and smokes...
  2. Uncle Ronnie 336

    js8call on 27.245

    just got into messing with this. i had to build a vox-ptt on perfboard which involves a preamp. its pretty neat, but i see more europeans in the early AM hours than anything. its pretty dead in the evening when i come home from work. anyone on here mess with this?
  3. Uncle Ronnie 336

    durability: IRF520 vs HG2sc1969

    in your experience which have you popped more of? honestly i dont have a good track record with the HG's. they seem to be more sensitive than mosfets
  4. Uncle Ronnie 336

    LD 1x2 ERF9530 mosfet

    so i have a few mosfet boxes that I homebuilt. i hooked the single up to the double and ended up getting 300Wpep ssb and 80RMS swingin over 250w on AM using a low drive PC 122 with abt 18w ssb and 3 swingin about 12 AM. theoretically 100W ssb and 60AM from that singlebanger driver is too much...
  5. Uncle Ronnie 336

    help me decide what to restore next.....

    the 25gtl is slowly crossing the finish line. i'm thinkin it will be posted in the gallery and the thread locked. next one i might either post in gallery, or maybe i'll do another thread to allow you guys (the peanut gallery) to interact with me while it happens again, idk. so in the pile i got...
  6. Uncle Ronnie 336

    cobra 25 gtl (taiwan) full restoration

    for the sh1ts and giggles i picked it off the pile and started messing with it. I was gonna recap and do some hotrod mods and leave it as an ugly ratrod, but after I had a safety meeting with my old man this last weekend, the face/bezel got disassembled, sanded the bubbling chrome off the bezel...
  7. Uncle Ronnie 336

    1750meter - 11m linear transverter experiment

    so we are allowed to tx between 160-190 khz longwave per part15 regs, so i had an idea to get SSB mode capability there, even though the rules state 1W INPUT to the final, and i will pay for the linearity, i'm going for it. a 27.000mhz local oscillator (raltron 4 pin vxco) feeds a SA602 mixer...
  8. Uncle Ronnie 336

    extended double zepp for 11m

    gave it a whirl flatside from the east coast hoping to net more contacts west of the rockies. the gain and radiation pattern is tight so using a geodesics tool and figuring out what local city i have to go broadside to, I got 2 trees picked out and hucked a nylon rope over the branches about 20'...
  9. Uncle Ronnie 336

    19gtl power output all over the place

    so there is an intermittent problem that I thought I solved with a recap. but apparently not. im thinking it might be a bad driver but i want to make sure first. power drops, audio flutters, eventually comes back but about half of it's power output. odd stuff. before it started acting up again...
  10. Uncle Ronnie 336

    cobra 19gtl limiter question

    is it c51, c48, or both for the release delay cap? coming soon: a 19gtl hotrod mosfet thread
  11. Uncle Ronnie 336

    cobra 25ltd c91 vs. cobra 29ltd C71

    ok so off of andy's advice that limiter release cap in these rigs get changed on the 29s and it makes the wattage ABSOLUTELY SLAM but when i try it on the 25, it supresses the modulation bigtime. looking at the schematic im not really seeing a difference in the layout of the 2 limiter sections...
  12. Uncle Ronnie 336

    cobra 29ltd '03 china, off freq by about 9khz low

    what could be potential causes of this? (other than made in china) haven't cracked it open yet, was told it was used in the operation of baling hay in VT so it was a former work rig.
  13. Uncle Ronnie 336

    RF24zx mosfet thread

    scored 10 off of ebay for $14 from a seller 6star claimed better RF than IRF520 so curiosity got the best of me the test bed radio is a taiwan cobra 29gtl so here are my findings so far: a homemade arrangement of EKL layout (470-1n4148 and 3.3k) and the first thing i noticed is low dead key...
  14. Uncle Ronnie 336

    realistic TRC 427/shottky/rx meter issue

    got a beautiful 427 on the bench, recap, npc, went well, so i did shott diodes in d7-8 but now the meter doesn't move on RX everything else works mint now. any suggestions on where to look? i am having trouble finding a schematic
  15. Uncle Ronnie 336

    cobra 19xs: no modulation

    got a cosmetically nice 19xs and the stock mic for it. no idea why it's not modulating. eyeballing a schematic and kinda at a loss as to why. radio's gonna have a home in a local jeep
  16. Uncle Ronnie 336

    cobra 140gtl NPC-rc mod?

    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
  17. Uncle Ronnie 336

    Cobra 28a recapped, low modulation.

    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...
  18. Uncle Ronnie 336

    Midland 77-882 squeal/oscillation on rx

    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...
  19. Uncle Ronnie 336

    Homemade (Palomar 450fet hd) issues

    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...
  20. Uncle Ronnie 336

    Galaxy dx959 original Green LED counter/lock weirdness

    Decided to grab a used Galaxy dx959 that looks clean and outside a couple pots turned is unmodified. So what is happening here is that when I initially fire up the radio, the counter reads 26.002 and then after a few seconds it corrects itself and locks onto frequency. Any pointers on where I...