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Thanks, Richard – Merry Christmas to you as well

Good idea, Merry Christmas and Happy New Year to all. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

I confused it with the 5645 Khz oscillator. That supplies the carrier to be modulated by the balanced modulator. It has an adjustment c-2, to center it between the two crystal lattice sideband

I did essentially the same thing to keep from loading down the circuit. I’ll report on the progress but for the next couple of weeks my priorities are going in another direction. Everyone have a

Hello, I have a fully assembled, tested, but never used Heathkit Shop power supply upgrade board for Drake amps for sale. Price is $125.00 plus shipping from 23418. Details and pictures are available

There is no 50KHz in the transmitter. BUT, Richard points out an important thing. 50KHz in the R-4s are adjustable... not by much, but with component drift or other problems, the 50KHz BFO MIGHT be

Disregard my post. There ARE two filters in the T4XB, upper and lower sideband. The curves are shown in Fig.17, which shows the "carrier" intercept at about 40 db below peak. -- Richard Knoppow Los

Its been a long time since I aligned my T4XB/R4B but I think maybe there is an alignment problem, not a bad filter or bad crystal. The idea is to set the 50 Khz LO so that the carrier falls at the

I’ve seen mixed ones like this before. Just production variations. Set C2 to exactly 5645.000 and check the results. The method from the manual is a pain, quite honestly. Hans didn’t have access

The filters may be from two different manufacturers or a change in outer can color by one supplier. Offhand, I don't know if different suppliers for Drake used different can colors. 73,Bob K9JU

Steve, I agree but stranger things have happened. I noticed that the two folders in this T4X have two different colors. If you look closely you will see that one on top is blue and the other on the

The chance of both filters drifting by the same amount is pretty low. I had to take a wire and put it near the CO and listen on my receiver. Steve Wedge, W1ES Time flies like an arrow. Fruit flies

Tony, can you also use the counter to read the frequency of the carrier oscillator in the T-4XB? It should indicate 5.645000-MHz (+/- 10 Hz?). Bob K9JU

Well I put the R4B on the bench tonight (with Linda’s help) and the verdict is in. The R4B’s crystal is cleared of any wrong doing. That would tend to make the culprit appear to be one or both

Makes me wonder if Frank could produce a new 48.050-MHz filter for the TR7.? Bob K9JU

First check the check the 10.0 volt supply. It needs to be dead on before any other adjustments. Then check the 40 MHz reference oscillator. That controls all operating frequencies, including the

A certain TR7 shows 300Hz. high on the digital display; tuning to the known correct frequency for several nets such that the received audio sounds correct always results in a 300Hz. indication to the

Frank made up a 1500 Hz filter for me and just received it today.? Works perfectly.? I highly recommend Noble Radio for filters. 73, Floyd - K8AC

Tony, AK4K Crystals has the 5.595-MHz crystal available as a stock item. Taking into inflation, the $32.00 price tag isn't "that" bad! Drake 4-Line Crystal - HC-6/U Holder Bob K9JU Maryville, TN

If you have good 500 kHz on the board make sure the protection circuit is working properly. Q9011 should be biased on to provide GND to the LED's. If not, none of them will work.