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I did re-check L21 and measured it from pin 17 instead of TP10. It was spot on. I checked the regulator (IC4) and it had no heat sink compound. It did have a clear insulator in between it and the chassis. I applied compound and also replaced the 3 caps (C133, C134 and C135) and it still was...

Can you share what you did to the amp to make it an HD?

Hi Everyone, So, I am finishing up this 148GTL and had an issue with TX after the alignment. I put it on air and after a few minutes it quit switching into TX mode (no TX light). I took it back to the bench and figured out that it was getting 1.6vdc at TP9 (PLL voltage) instead of 3 or more so...

UGH!!!! I need to get my head above water!!! That's better than saying I need to remove it from....... So, I think that schematic is wrong by labeling VR10 in that location. In the alignment guide VR10 is for TX Meter. On that schematic the TX meter adjustment is labeled VR9. I should have...

Thanks LC!! This is a clip from the 69VHP that I was referencing. I'll have to trace it out on the board to figure out which version I have.

As an update, I broke out the trusty Knight VTVM and measured the input to VR10 (TX meter adjustment) to compare it to the wattage output of the radio. On an AM carrier I read 4.2vdc at VR10 and the voltage dropped to 3.3vdc over 15 seconds while the carrier remained steady. While I do not...

So I have a Cobra 25 LTD Classic side mic (old school) and I am looking at some pics of the 21. The 25 has a few things that the 21's do not such as a NB, RF Gain and CH9 switch and I am not seeing a 21 with them. The 21's have a variety of things like a Loc/Dist switch, Dimmer knob, and even...

Hi Everyone, I have an op with a 2950DX and mostly uses it on AM. When he 1st keys up the meter will display 4 bars and display 3-4 bars of red on modulation. After about 30 seconds of use (not continuous) the meter will no longer show modulation. It wil contiinue to show the carrier power...

I'm going to look at this tomoorow but you know.... I am using the alignment guide for that version 148 and I noticed that the alignment guide for the more recent (China) versions have you align the oscillator on 19.

Good Day Men, I have a 148 from Malaysia (1992) on the bench for aligment. I have removed the glue and I will say, this one had more corrosion than I am used to. I had to replace a few resistors, caps and 1 diode becasue they were so corroded. The radio was way off frequency when I started...

Could you clarify (play on words here) which Nomad procedure you are referencing?

So here is the update for now. The attenuator is bad. The relays act a lot like a solenoid and one of them is bad. I did order a replacement off eBay and it should be here this weekend. We shall see. These HP higher end generators are built like a spaceship. Holy smokes is it impressive......

Thanks Brandon, I'll check it out tonight and keep you posted.

Ok, so the life of a hobbiest. I am aligning a radio and having trouble with the receive alignment. I play with everything but it turns out that my HP 8660C signal generator is not working correctly. When I go from -80dB to -70dB the signal drops out. It's a battleship of a piece of...

A little update here. I had a few minutes today at the bench. Also, see attached for a better schematic that shows this circuit and a pic of the board. When in TX mode I get 65mA at the meter (about 1/2 way). Based on the schematic, should I get a similar reading at D5 or at D316? I will...

Hi Everyone, I hope you all are safe as these storms blow through!! I have a Cobra 29LTD Classic, 4-pin side mic, PC-900 board) in for alignment and everything works except the meter shows nothing on RX. The RX did align fine (-12db sinad @ -113db). The RF Gain knob and alignment adjustment...

I listen to this all of the time. These are good operators loving the hobby!!

Thanks for the clarification Jeff!!!

Good Day Everyone, I picked up a Pride 150 in great condition (inside pic attached). I tried it out on air and a local op siad it sounds great on AM but bad on SSB. His comment was that it sounds like it's not biased correctly. There are 2 varicaps on the inside and I am wondering if it may...

Ok, so I had this same issue with my 30 amp supply. It's a TP30SWII. It was only powering a 150 watt amp and it did not do this at 1st. Something internally became loose, not broken though. I am anticipating that it is the transformer or an inductive coil as there are no moving parts except...