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Thanks Jim! I'll get on it asap and keep the thread updated :). /Michael. [email protected]> wrote:

On trying to use a Drake SP75 Speech Processor with the TR4310 Communications Transceiver. I'm pleased to report that the TR4310 has been working flawlessly since it's recent major surgery. I have

Hi Joe, Try oldradioparts.net. Mark Oppat stocks literally thousands of potentiometers in every possible configuration, and will even customize them for you if needed. Very reasonable prices for

Mostly agreed but has nothing to do with distortion. Passive microphones, which include crystal, ceramic, magnetic, moving coil, ribbon are generators. They look like voltage sources. They do have a

On 2025-02-03 17:12, Jim Shorney via groups.io wrote: Impedance matching > in microphone circuits is a myth. *** Agree 100%. Microphones are about VOLTAGE, not power. Want low distortion? Don't load

Point taken. I haven’t spent much on radio lately, so I owe it to myself :-D Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton

I hate to say it but you might be better off with the Heil cartridge. In my mic comparison runs, the 7077 cam in dead last behind various vintage Shure, Turner, E-V, and modified D-104/UGxx

Yeah, they did the second time. It’s frustrating. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

"Normal" is the one shown in my photos. "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: -- 73 -Jim NU0C

It was working fine until Sunday. Perhaps, I’ll try resoldering all the bad-looking connections and/or testing the transformer. As bad as it looks, it was working. Most of the stuff I see on eBay

Teve…none of your images cam through! Joe – W7RKN From: [email protected] [mailto:[email protected]] On Behalf Of Steve Wedge, W1ES/4 via groups.io Subject: [DRAKE-RADIO] The mysteriously

This is shown on the schematic. It appears you may have an early board. The PIN diodes are different also. This pair of PINs are used to inject the calibrator signal. "Michael Jensen via groups.io"

I’d just like to put the thing back to original. Even the Heil elements now have transformers. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton

I prefer the C in tight quarters on CW. You can get crystal filters down to 250 Hz stock and 125 Hz if you search. In pileups, these are the equal to newer rigs’ receivers. For everyday, casual CW,

You may need to check your internal grounds, including all screws and any copper fingers attached to boards. As well, the board cage covers need to be attached with all screws, snug but not over

That seems likely to be the same cartridge shown in the photos I posted to the group photos section. And yes, as I mentioned previously, it is a cheap CB-era low impedance dynamic cartridge. Thus the

That's what the transformer is for. Although I will say it again, it is not impedance matching. It is a voltage step-up. Impedance matching in microphone circuits is a myth. This is well documented on

Yes, you will need to adjust C61 on the R-4B, exactly the same as if you were using a T-4XB. You won’t use the CAR OSC cable and should put a shorting plug in the T-4XC’s PTO LAMP connector. 73,

Also attached as a .JPG file. Paul, W9AC Sent: Monday, February 3, 2025 7:07 PM To: [email protected] Subject: Re: [DRAKE-RADIO] 7077 Mic Attached below is an LTSpice simulation of Astatic's T-UG8

Attached below is an LTSpice simulation of Astatic's T-UG8 2-transistor preamp.? Input Z varies between 100 Hz and 3 kHz.??As expected, the input Z varies based on differing hFE (beta) values.?