开云体育

We tried a 20 meter net many years ago and it never worked out. Very limited check-ins.? We also had a 75m swap net and had to disband that some years ago due to lack of participation. 73's, Mark,

The performance of ceramic caps depends on the exact type of material.? npo type are very good ,? it is the "hi k" type that have problems.? Temperature compensating caps have charities similar to

In comparing early and later R4C power supply schematics, a capacitor (C201) was added going from the output of the low voltage diodes to the high end of the filament string. It is listed as 20uf

Ceramic capacitors are bottom rung devices, with differing temperature coefficients depending on type (NPO being the best for routine cooling and bypassing applications). They do not fare well at low

Hi Bill, I use Mylar capacitors. Leakage and Q, but I suppose you could try ceramic. Rob, NC0B

I don't see any mention as to what type of capacitors to use. The reason I ask is I don't know why Drake used large tubular capacitors in their design. Is there any reason ceramic capacitors can't be

Hi Rob, It is Network Sciences Date Code (?) 7905 Thanks Lionel

One caution! If the knob is loose, please do NOT overtighten the set screw. This will surely result in the knob being stripped or split. If it's loose because the shaft is hard to turn, remove the

A normal selector switch. Is your knob set screw loose? ....Dave

That knob should most certainly operate with a click at each position, allowing reception of AM, USB and LSB/CW. There are two possibilities. One is simple, that the set screw for the knob is loose. I

Hello everyone, Last summer I picked up a 2-C to go with my 2-NT. I have been using it for CW without any troubles. I tried to listen to some SSB signals tonight and I found a problem... I cannot tune

Doug, Yeah, its personal preference at this point.? Some guys figure its supposed to be Lagoon Blue so they use blue LEDs.? OOH, not for me. Warm white is what I think is best but...? I bought the

I was going to post the exact same thing. I second it... JB WELD should fix it. You probably need to make it a little thicker than the original insulator for strength. If it doesn't plug in quite as

Lionel,Possible solution FWIW: Pull the pin out of the case to the position you want it Do some careful horizontal surface scoring near the base of the pin (small file, nail file, etc.) - don't go too

Which OEM made the filter? Rob, NC0B

One of the pins is pushed back into the filter case. I can gently pull it back into position but have found no way to secure the pin from outside of the case. I have tried various cements, epoxy,

Gary, I did the same thing but I found the bright white to look the best in my 4C line. However, I was not using the same style bulb. It is convenient to use the bayonet style though as it is just a

I'm in south central Montana and can only hear the net down in the noise on 40 - unintelligible. The Collins group has a weekly net on 20 meters that I can easily copy on the high end of 20.

I would sure like to participate in a 40m "Drake Net" but I cannot hear anyone on the above net. There doesn't seem to be one (40M) reachable from the West Coast.? There is some sort of a Drake net

I was really disappointed in the looks of my old #47 bulbs in my 4A line so I changed the bulbs out for LEDs finally. Not only do they keep the front of the radio so much cooler, the looks are so much