Search results

You can position the gamma match behind the driven element instead of on the side. This will make the forward pattern much tighter but will also reduce the back rejection. I have never set mine up that way but many have down here and that was the results they obtained.

Sounds like you might need to clone yourself? Congrats on all the business!!

That's Kewl. You can just insert a resistor in the power lead to drop it to save modifying the board. You can also wire it to where it will squirt when you key up. I always liked to set mine up that way. It would sure make a wattmeter move to the right when you keyed up. Good luck on all of...

Why not just use a dropping resistor on the "hot" lead for the toy? That is the way we did it years ago to slow them down. Also if it is wired with the hot wire through the button add a 1uf cap (experiment with value) from the toy side to ground. When you let off the button it will give you a...

An 8950 and a M2057 will test the same as a 6LB6 with the exception of 12 volts on the filament. Expect higher output ratings than the LB so you might drop the filament voltage to 9 volts or so to check the true output. The Maco 75 should have came originally with a M2057 in it. A lot of...

The keying transistor could be leaky causing this. I've seen this happen in base amps on SSB.

Sounds like bad power connections. I'll bet it won't stay on when keying it on AM either. Unhook the coaxs and see if the amp will power up without them connected. Sometimes if you do not have a good ground to the amp it will "find" one through the coax.

I've always found it is easier to ask for forgiveness than for permission.

It is a great radio. I own three of them and use one constantly in my vehicle. I bought my first one in the late 70's when they first came out. Good the find the box also. 10kHZ bump is real easy to install. Great find!!! Want to get rid of it? Holler if you do. I can always use another...

I see my avatar has been compromised.

In or out of circuit if they read open in both directions they are bad.

Ok, more info. It was working fine but changed then. Maybe wires are touching? Doesn't make any since it was fine and then changed. Did you go through the procedure checking the wires to the rotator as far as ohm'ing them out? Something is screwy for sure. Let us know what you...

Check the terminal strip wiring on the rotor. I could be that it was replaced and the wires on terminals 3 and 7 were reversed. These connect to either end of the direction potentiometer. If swapping these two leads on the connecting wiring between the rotor and control box (on one end)...

Check D3 and D4. One or both are probably bad. This happens when the Modulation meter is used while operating an amplifier. It cannot handle checking modulation with power applied......only a radio.

Try reversing leads 3 and 7 on the control box and see what happens.

I can't see it all the way but something looks like it might not be right on the relay wiring. From the photo it looks like the jumper for bypass operation is grounded. This would keep a radio from transmitting through the amp when in standby. Maybe I am missing something?

Stock would be with all 8950's. Check the wiring to make sure it is correct, filament, bias, grounds, etc, and the filament voltage is correct (12 volts for 8950) and use 8950's. One other thing on the 750 with the pre-driver tube, do not overdrive it. A dual final radio is too much for it...

Did the set of radios you are talking about look like this? SHACK PHOTOS 3

Speaking of the chimney, and I'm sure you have done or seen this done. Instead of shelling out $45 for a new chimney, you can use a Coleman lantern globe which sell for less than $10. You can also fabricate the clips without very much effort. Short pieces of spring steel work great!!! Anyway...

One thing for sure is in 1970 the radio would be a 23 channel. Courier, Johnson, Browning, SBE, Pearce Simpson, Hy Gain, would all be radios used as mobiles around then.