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The Schematic Diagram of the Drake 2-AC Crystal Calibrator can be found in the back pages of the Drake 2-B Communications Receiver.

Today we had 34 check-ins on the net. The following radio's were used. Twins = 10 TR3 = 1 TR4(x) = 14 TR5 = 2 TR7 = 3 Next week Bill, W9MXQ will be the net control. 73's, Mark, WB0IQK

I think I have one disassembled in a box. If I can find that, I'll get a picture of both sides of the PCB. 73, Barry - N4BUQ

Don't know if this is what you are looking for, but here's a couple of pics. 73 Stan KM4HQE

And again with my typo fixed. I proofread it, honest! "Jim Shorney via groups.io" <jimNU0C@...> wrote: -- 73 -Jim NU0C

I've updated K4JNG's digital board schematic image with the in circuit test points flagged and the optical interrupter part number added. -- 73 -Jim NU0C

That's good price. There are two on eBay for $11 and $15. I may have to buy a pair for spares. Thanks for the info. 73 -Jim NU0C "K6OXN Bob" <bobk6oxn@...> wrote:

OK, good. That is pointing to the optical interrupter. It may have been useful to report the actual minimum and maximum voltages coming out of the interrupter since this is essentially a analog to

Hi all, I am currently trying to rebuild a 2AC crystal calibrator that has been butchered by a previous owner. I have stripped it down to the bare circuit board, and would appreciate a picture of the

I also forgot to tell everyone that Green Brook Electronics is the source of the Optical Interrupters for the RV-75.? Part # is OPB813S which are $5 each shipping is $7.99 73? Bob

I did follow the schematic, and I apologize for not reporting the voltage readings. TP101 reads 1.112 vdc and TP102 reads 8.31 vdc. TP101 does not vary when turning the tune dial, but TP102 varies

If you want to help please look at the schematic. 73 -Jim NU0C "Clint VE3CMQ" <ve6cmm@...> wrote:

Did you make any of the voltage measurements that I asked for? Voltages on pins 2 and 7 of P102 could be helpful also. Don't assume that the part is bad just because you moved it. You could still have

Hi Bob, It sounds to me that either the emitter or detector on the one channel of the encoder isn’t working. It might be easy to repair this problem. I don’t have an optical encoder like the one

Well by taking the Optical Interrupter apart and reversing the 2 elements, now the unit increments only. Will keep everyone informed after getting them and doing another calibration.

Nice Loop. I'm planning a somewhat larger one. So far, I only have the capacitor. 15-250pF @ 45kV. - Jerry, KF6VB

Thanks for the pic and info Mark. That looks like something I would build! I've been meaning to work up something to carry my LAN-IQ portable SDR receiver around. Yes, bearings from two or more

Good morning to all on the list! After much thought I have decided to part with my TR4C and RV 4C. I bought these from GAREY BARRELL back in 2010 during a visit to his QTH in Glen Allen Va . It was

hello, I am selling my DRAKE TR-270 transceiver TRX in VHF and RX in UHF perfect condition, with its TNC 270 card (radio packet and WeFax...) with microphone, documentation and program disks in

Jim, Thank goodness the interference was gone the next day and has not returned. I hope it never does. Sounded like one of these horrible Chinese, switch mode / pulsed chargers for automotive