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*** Indeed. I had a QSO on one of the forever discussion groups on 40M. The net control was flabbergasted that I had managed to fix a Signal/One. I tried to explain that it was really a fairly

Scratch that. I just looked at the schematic again (since I just finished stitching the three scanned images back into a single schematic) and the Full Coverage section (U9001 through U9008) gets its

Just as a side note, 9001 through 9008 are not related to the frequency counter. They deal with PLL N codes that are passed from the Digital Control Board to the Translator Board. That's not discount

Okay, I have been working on the DR7 board and I found that the following I.C's do not have any Plus 5 volts DC on them. They are U9001, U0002, U9003, U9004, U9005, U9006, U9007, and U9008. I do have

I used to use Motorola Crystal Ovens from T43-GGV, etc, 6VDC, 2 in series run off of 12VDC to do that. Frank Krozel Life Member, ARRL (630) 924-1600 kg9hfrank@...

As good as they are, crystals "age" and tend to move down in frequency. I believe it is due to the little contamination inside the can that migrates to the blank, thus loading it to a lower

"withe the NORM/EXT set in EXT, the display should be on, and showing 00000" mike wb8vge Actually, EXT mode with no sample port input, DR-7 should blank with only the 100hz dot illuminated. All zeroes

Check for the 500 kHz signal coming from the PBT/Reference board. There is a protection circuit in the DR7 that shuts off the LEDs when the 500 kHz is missing.

You ship your brand E, I, K, or Y radio for repair and they charge you just to look at it. Guess what they are going to tell you after charging you to look at it: (A) non-repairable (B) parts

I have seen crystals go off frequency. Just worked on an R-4C with the 5645 Xtal sitting at 5642. Crystals off by that much cannot be “rubbered” to 5645. The solution with that receiver was to

I have resorted to disconnecting the board by removing the wires and leads., rather than have to navigate a 700° iron down to the bottom. The design was still, overall, 1950s/60s. With circuit boards

Hey Bob, glad to hear that all is well in TN. Yeah, when I fudged the transmitter carrier frequency to net with the receiver is when things got snaky with the USB/LSB imbalance. Sooo…I went back and

OMG!? Those aren't HAM radios anymore.? Aren't those only about $1200 new (with a warantee)? Throw away radios.. just like cell phones and all new gadgets. I am sure loving my old ancient Kenwoods

*** AND, they put all four pins. I replaced the female Molex with a new one, and wired up all the pins. It still works either way. - Jerry, KF6VB

This item SOLD. - Alan K9MBQ

Check all voltages. You have two 5 volt regulators on the sidewall. One powers the counter and one powers the LED display. They are fed from the 4 pin Molex near the right edge of the board. R9092 ( 5

*** There's worse. My FTDX10 has a problem with CAT control over USB. The responsible circuit area is under this single giant board at IIRC the bottom of the radio. To get at it, you have to undo an

Evan, Mike & Group, Nailed it. The PCB beneath R55 (bias pot, and part of S-meter calibration) had missing traces and a past 'repair' was intermittent. Cleaned up the rosin mess and bypassed the

HI, Tony. From your description of bassy on LSB and squeaky on USB, the carrier oscillator is not in the middle of the two sideband filters of the T-4XB. If I were you, I'd adjust the frequency of the

Thanks Mike for the reply. I have checked a lot of the IC's and they do have 5 volts VCC on them but will check them all. Maybe one does not. The NORM/EXT switch on the back does not do anything. they