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I have finally gotten my R4-c working and I am considering the IF filter upgrade that Rob used to provide. Is Noble the best source for it and if so do they have the specs for it. If not, can someone

I don't want to pick nits here but the statement that all filters will fail, and it "could be now" is just not setting the expectations properly.? I agree that some filters do fail over time for a

You can also ditch the ALC in the amp and use an adjustable negative low voltage source to the radio. Several simple circuits are out there, some using a 9vdc battery and a potentiometer and others

As a side note, the ALC on the L75 is similar to the L7 and L4B in that it is frequency sensitive. ?Adjusting it for 10-15 meters, for example, will result in overdrive if switching to 80 or 160

Tony, The manual for the L-75 provides all of the information you should need for connecting and operating the TR-7 with the L-75. Refer to connection diagrams and section on "SSB Tuning and

I don't need one at the moment but I'd be willing to get a new 600 Hz filter for my TR-4cW RIT. I actually had one in another rig fail and I was fortunate enough to be able to take it apart and fix it

Hello, He can make almost any filter, however there needs to be enough demand to allow him to acquire materials and put some profit margin into the task!For one two or three units? It wont happen. It

Use amplifier ALC and your mic gain to control the drive. "Tony N5DIM via groups.io" <tony@...> wrote: -- 73 -Jim NU0C

Hello everyone. I’m picking up a L75 tomorrow. My TR7 is running around 120-140 PEP. If I need to reduce drive power to amplifier is the only way the WB4HFN mod to alc?? When the amplifier spec’s

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