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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.?

I purchased an AC-4 power supply and noticed one of the 3 lugs was snapped off. Lots of 10Ks out there, but not with two mounting fins for the case. Has anyone replaced these and found a suitable

Are you talking about a D-104 element? If so it should measure open circuit for DC. It should look like a capacitor. If you are getting resistance it is defective or else you are measuring something

I have just about run to the end of my patience with apps and webpages that still think they’re in 1993. I should be able to up load photos. I will try again. Steve Wedge, W1ES Time flies like an

As promised, this is my semiconductor inventory. Some of the most common ones (ex.: 2N2222) I want to keep a minimum of 5 units. There are others here that could come in handy in quite a few pieces of

Hi Scott, have you read the VE3EFJ "Drakemod" manifesto? If I recall Wayne's verbiage, it's something like this: The R-4B is a terrific receiver out of the box and it does everything well, however you

Scott The R4C has sharper crystal filters but other than the standard filter for SSB you had to purchase the AM filter if you wanted 4KC or 6KC selectivity and you needed to purchase CW and RTTY

All right I promise.. I'll stop spamming the group now :). But one more thing that appears to be a modification, again any one got an idea of why and is it a known modification? I'm referring to the 2

Hello: I have a question about the differences between the Drake R4B and R4C receivers. In some of the online chatter I have been reading, it is my understanding that the R4B is considered to be

Can't see the pix! - Jerry, KF6VB

Contact Ken at ken19604520 at sbcglobal.net

Here are some pics of what I found inside. I have doubts as to the originality of the element itself, as it measures 430 ohms, resistive. First photo shows what the element looks like in its housing.