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All my kit PDFs are now in the files archive under Sherwood. Rob, NC0B Sent: Sunday, January 05, 2025 12:11 PM To: [email protected] Subject: Re: [DRAKE-RADIO] VE3EFJ third mixer mod for the R4C I

I would also be interested in all the R4C boards. Also any instructions for populating the boards.? KA2NJF Walt? Sent from the all new AOL app for iOS

Paul, The photos in the PowerPoint presentation were taken with an HP 3585A spectrum analyzer. As you can see in the screen shots, the resolution bandwidth was 10 Hz. The 3585A or B goes down to 3 Hz

I used a 3/4-inch Greenlee punch because that's the smallest in my tool case. Photos attached showing the new holes and the abandoned holes that are offset by 90 degs. The wiring is kinda' in the way

Interesting, and less amps on the power supply. (I think incandescent 6.3V 47s were 100mA). Any before and after photos? gmail.com_at_groups.io_lastradioman@...> wrote:

Stan, Either of those would work, but I suggest the larger one. Mine are Greenlee and had no problem punching the two holes. I snipped off the transformer leads, removed the transformer, punched the

Hi Joseph, Point taken that a mail carrier may not take a walk on his days off. That said, every product my cottage industry company produced was used extensively to be sure it worked as well as

Doing this kind of work is when a real spectrum analyzer with low RBW really pays off. IMHO, to get a good look at close-in 60 Hz sidebands requires an RBW of no more than 10 Hz, with 1 Hz offering

What size hole punch is required? I think I still have a 1/2” round and 9/16” round. I think 16 gauge steel is the thickest they can cut. Maybe find a single hole punch on the auction site? 73

I know this has been covered in depth in the past, but after reading all the old posts, I ended up ordering these ( https://www.ebay.com/itm/175812049500 ) on eBay and installed them today.? They are

Well, I let my hole punches get away from me decades ago and I'd guess that they'd cost more than I'd like to spend these days.? Great work by you guys who figured out the source of the 60 Hz

I did the same although I don’t recall if it was possible to remove the transformer bolts, rotate the transformer, then drill new chassis holes. The wire lead length and existing routing/dressing

Hello Mr. Rob, I have asked this same question several times about the designers actually using their own hardware! They DON'T... For if they did, they would have noticed the modulation of a CW note

Hi Floyd, Yes I rotated my transformer 90 degrees, and my technician made the change to two other R-4Cs over time. It takes less than two hours on the assumption you have a chassis punch, a hand drill

Jim: Answered this one yesterday....guess you didn't see it. The four feedthroughs in your pic are all .001 uf @ 350VDC. K4OAH's Service Manuals tell us this kind of info and are highly recommended.

Whentuning up my TR-4C, slowing increasing XMTR GAIN and peaking RF TUNE, there is a strange BLOP sound? from the speaker. Please see the attached video clip. I suspected selfoscillation or a leak

Sounds as if one of you has actually rotated the transformer 90 degrees.? I just took a look at that area of the receiver and decided that task ranks right up there with removing your own appendix.?

For the curious, the magnetic field created within the transformer couples to the PTO which is located directly in front of the transformer. The field produced is much stronger in one orientation. As

Thanks Jim for the ideas. I had started the alignment and when I got to the BFO I could not get the frequency down to the correct frequency. So I am going to order a new crystal and replace iut and

working on a T4X transmitter shown here any help please ? Thank you - de W6TTY