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Yes, that was an early test.? Yes, the noise was still there.? I previously had biased off the first mic stage and the noise disappeared, so I concluded that it wasn't coming from the audio strip.?

The noise if being observed (visual and audible) on an external transceiver spectrum scope.? The signal is being sampled at a sampling port on the dummy load and is applied to the monitoring

he is talking about the shield on the cable. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of correctness. https://wd0gof.com/bible-study/commentaries/

I have lost track here. Have you just shorted the mic connector to see what happens? If you have does the noise continue? -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

How and where are you sampling when you see the noise. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of correctness.

Well, the AALC idea didn't pan out.? I disconnected one end of the diodes and also removed the plate supply from the AALC amplifier stage.? No change whatever.? Also played with the mic? connector

Thank you sir

Interesting idea - thanks, Paul.? Will look into that. 73, Floyd - K8AC

Mine has a 25uf 25V electrolyte built in. Von: [email protected] <[email protected]> Im Auftrag von Tony Lunsford Gesendet: Donnerstag, 25. April 2024 07:43 An:

Floyd, I don't own an HT-44 but looking at the manual, it uses AALC like some other Hallicrafters gear.? Possibly part of what you're experiencing is a low-threshold AALC.? Temporarily disabling it

In the HT-44 manual, specs page, there is no information on that.? They list carrier suppression, unwanted sideband rejection, thrid and fifth order distortion products and unwanted beat output,

FloydI see that the noise is about 40 dB down in the SA displays.? What is the spec for the HT44?Regards,Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

Yes, I originally went through the unit using Walts HT-44 Repair Manual.? I have no idea what you mean by spec AN.? I readjusted the carrier null and unwanted sideband suppression again after taking

I used polypropylene film caps when replacing the discs.? There really was no change in the noise compared to the original caps.? All of the replaced caps had broken ceramic where the leads entered

Tks Jim, excellent artical. ________________________________ Sent: Tuesday, April 23, 2024 2:03 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios]

FloydWhat type of disc capacitor did you use as a replacement?? See:https://www.allaboutcircuits.com/technical-articles/x7r-x5r-c0g...-a-concise-guide-to-ceramic-capacitor-types/ It might be worth

Have you completed Walts suggested alignment using the spec AN? Is the carrier nulled deep? Is the opposite side band nulled? It sounds like you have done this but wanted to make sure. If this is not

HT-44 - one last query for ideas before moving on.? ?The problem is a lot of "noise" within the audio passband when in LSB and USB modes.? I previously had thought the problem was in the mic

The 51E schematic is missing from the K9AXN website.? This change was listed to fix the 30hz offset on RX and TX.? ?My radio has this problem.? Does anyone have a copy?? Or does anyone remember

gr8 big thnx----73 tom NU2W