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I am waiting for a new BFO crystal for my TR7 so in the meantime I am working on my TR5. The 10 volt power supply failed when I turned it on a week or so ago. I have checked just about everything I

It’s a possibility, so bear that in mind. If you’re only off by a frequency that can be adjusted with knob-slipping or moving the fiducial, I’d leave it alone. Steve Wedge, W1ES Time flies

Spline / Bristol used on these knobs ? https://mgs4u.com/?srsltid=AfmBOopkFgkqv8BTVfH2LZxxvG9xMAkMZpWCLV9VPwCLuG0hX5szHTCW

Curious Steve, does baking ever make them worse.? ie if you had a xtal that was marginally off frequency are you taking a risk of making that xtal worse than it already is?? I've got a couple that

It’s always worth a go. I get about 70% success. That fact that you’re seeing something happening with them is encouraging. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a

Beware, it's 17 msecs for that drake clunker to operate.? The xcvr needs a 20 msec delay....to give the mech relay in the L4B a head start.? ?I remember ordering an identical 3PDT? from I think

Jim, I didn't notice any capacitors of that brand, but will keep my eyes peeled. I did replace a few electrolytics in key positions in the normal course of business when going through the synthesiser

OK, I'll bake the two tomorrow. I think they'll taste best with chocolate icing! LOL! Dave

Very nice write-up. Congrats on finding the problems. A suggestion based on my RV75 experience, if you have any electrolytic caps branded "CAPAR" replace them on sight. They are rubbish. "atlasstuff

Several hours in a 350°F oven. Put them on foil. Actually, that was my first idea when I tried it but one of our engineer members had a great description of the baking process and how it removes

None of my Sherwood product kits were for the Drake transmitters, they were for the R-4C. I am not aware of any TO-5 relays in a stock Drake product. Rob, NC0B

Steve, for the uneducated, please describe the baking process. I assume you are rewetting the solder connections on the sides of the crystal blanks. Dave

Dave, it's starting to look like you have two bad crystals. Have you tried baking them? I know this thread is long, so excuse if this has already been done. Steve Wedge, W1ES Time flies like an

Are these direct replacement in TX4B’s ? Bill AE8EA

Well, I tried that, no joy. So I tried a few other things. Using my SDR to receive the Xtal oscillator I find this: 28.0 (42.5 Xtal) oscillates at 42.603 but no proper receive, warbly sound 28.5 (43.0

Finally got this working well.? First, I installed a 7 pin DIN connector in place of the 4 pin Accessory connector on the rear of the R4C.? I connected the INJ jack to this connector using a piece

I have one available - its on QTH.

I wonder if Mark NO5J might have another one? Ron W5SUM

I got up with Mark, NO8J, this morning and he is going to send me one.? Harbach and Nationwide Radio neither on have it. Thank you for the suggestions.? I appreciate it. 73, Ron ND4R

The following items have been added to the Files area of the [email protected] group. * /TR4310/Drake TR4310 VRTO VCO FET Substitute Tests G4FPH.xlsx (