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Yes, there were two versions of the Power Supply board. The early version uses a pair of bipolar transistors as a power oscillator driving a small transformer to generate the voltage for the +24 and

OK... I have done some searching and found the TR7 files. Does anyone on here know if there were different versions of the R7 power supply board, not the 13.8v board, but the power supply board. I

AFAIK there is no such document for the R7. There are for the TR7, in both photo and table form, in the Files section of this group. There will be a fair amount of similarity to the TR7 and they will

Hello... I am new here. I have been looking for a document showing where the pin numbers referenced in the R7 service manual are located on the parent board. I understand such a document exists but

Looking for the SPR-4 preselector knob. Can anyone help? Peter OZ8CTH

I also looked at the output with a scope and there was nothing after key-up. Steve Wedge, W1ES Time flies like an arrow.? Fruit flies like a banana. Sent with Proton Mail secure email.

They look very reasonably priced! 73, Gary WB6OGD [email protected]> wrote:

If interested in purchasing any items listed on my for sale page, please contact me off group through my email address. mikew5rkl at gmail dot com 73 Mike W5RKL https://www.w5rkl.com

The same pictures are listed on my for sale webpage. 73 Mike W5RKL https://www.w5rkl.com

Additional Drake T4XB pictures; Front ( https://w5rkl.com/wp-content/uploads/2025/04/Front-768x576.jpg ) Rear ( https://w5rkl.com/wp-content/uploads/2025/04/T4XB-Rear-View.jpg ) Inside Top View (

That's an interesting case. You should be aware that an oscillation will most likely be anywhere else but where you are listening. The 40 Meter instability that surfaces in some rigs actually occurs

I noticed it around 9 pm, CST on virtually all of 80M, 40M. I think it was present on 20M as well. Barry - N4BUQ

What time and what frequencies? 73 Stan KM4HQE

That's exactly what I thought it sounded like! Barry - N4BUQ

At my house it’s the xyl’s wash machine! AE8EA

Just tested mine using same settings and don't see meter swinging right after completion of character send during short CW delay settings. I did have a 40M parasitic oscillation but sounds different

The situation: When I transmit on CW and let up the key, the meter goes to the power out during key-down, as normal. When I let up the key at the end of sending, the meter swings hard to the right

I wonder if this might be a new Over-the-Horizon radar system? Lint, VE3CMQ Sent: Friday, 25 April 2025 12:06 To: [email protected] Subject: Re: [DRAKE-RADIO] Noisy Lower Bands

On Friday, April 25, 2025 at 12:37:39 PM EDT, n4buq <n4buq@...> wrote: I hear it also mainly on 80 meters as that is where I mostly operate.? I have no idea what it is.The s-meter

While listening to my TR-4 late yesterday evening, I noticed that the lower bands had a prominent, continuous "swish-swish-swish" noise at about 2 or 3 Hz. I checked and I was also getting that on my