Search results

Remove the keyup lead. If it stops, your keying lead is grounding the internal relay circuit causing it to pull up. All the standby switch does is prevent the internal relay from operating. If you lose your receive without the keyup connected, there is an internal issue. Good luck.

On the tube types that were used in these amplifiers, they were mostly a muti-elment type called a Tetrode that needed a screen supply. The tube types were usually from television use where linearity was not a issue as it is for RF power application. As well, the screen supply circuits were...

The original poster has asked about things that require very involved answers. 1. Filters are required to attenuate harmonics produced and passed through the amplifier that could cause interference to other equipment and services at other frequencies. 2. Intermod distortion is produced within...

Need a lot more info as to what radio, does he have a ham ticket, what bands, why computer control etc. There are number of radios and a few programs to control them by remote over the internet. A lot of possabilities once this basic info is known.

Have you noticed the crap on 20m is much less lately? The FCC finally nailed some people so suppose the word got around.

The meter is designed for 50 to 150 mhz right on the front panel. On radio AM mode, meter set to 20 watts should see the carrier. With the key down, SWR set to forward, make the calibrate setting then switch to reflected power. It should show any reflected power. If not the meter circuit...

What needs to have attention paid is what signal strength you get from the repeater. If near full strength on your radio but the other stations are still in noise is not your problem. It's the other station not getting into the repeater receiver with enough signal. If your high as in...

Yes you have been out of touch a long time. There are vertually no glass tubes made in America any longer. The 3-500 and 572 are all made in China. Most FM and TV transmitters are all solid state into the hundreds of Kw range. They use push pull modules with combiners in and out of get to...

The photo in the first post looks like the resistor lead was stressed too much when mounted and broke apart from age right at the end from heating and cooling over time. The other colorations are normal dirt and migrations from heat effects.

Heil Pro Elite with boom mike has stereo head set feeds and phase reversing switch.. Most Ham radios only have mono audio except some high end radios with two recievers. To use the stereo head sets for mono you need to get conversion plugs from stereo to mono and or use the correct patch...

Hello Dr. Alex, Nice to hear from you. Sorry to hear of Paul's position. I am the Ham who bought your GS36B tubes for use on 6 meters. The amp used a 4cx250 originally and converted to your GS36B. It's a plug in with reset bias and larger cooling sleeve as long as the power supply will...

What's being so hard to the programming? You start in the VFO mode, dial in the frequency, the offset sign, the PL Tone and power level you want, then tranfer it to an MR number. All you need to remember is the 3 Menu number of 21 the offset direction, 27 the PL tone selection and 28 set tone...

75 amp heater current sounds like a pretty big tube is contemplated for a lot of power on CB band. You better know what your doing.

The output impedance of an amplifier continiously changes with drive and output level changes. As the frequency is moved, the match also changes. As the antenna match changes with frequency, the amp output impedance see this change. They all inter-act. Once you set up at one frequency, the...

The cans are interstage coupling transformers. They are designed to tune a specific IF frequency. Many are 455 khz or 262 khz but may be other frequiencies. Some are center tapped. Sometimes the center tap is not used in a peticular circuit. Unless you know what frequency they are they won't...

With operating voltage so far out of the norm and no metering, how do you expect to see what's going on? This tube requires a closed chassis on the bottom side with a forced air blower to cool the anode fin assembley up through the socket. Do you have that kind of blower and not just a fan...

Im' sure you already know you can only use these radios on 10 meters between 28.300 and 28.500 SSB, and on 6 meters for SSB, FM and AM phone with a tech ticket besides the CW portions of 80, 40, 15 and 10 meters until you upgrade to General class.. The Kenwood TS 480 is one of the best...

The Workman 3P is a dual meter. Left meter is power at 10 watts max. The right side is used for SWR measurments. Switch the meter to the SET function. Turn the adjustable control to min. Key up radio. Advance the control to make the meter read full scale to the red set line on it's scale...

A birdie! It is two signals beating against each other with a difference in frequency within the audio range in a radio's own receive even with the antenna disconnected. Nothing to do with transmitt or off the air signals.. Transmitt is spurs and harmonics and IMD being transmitted as...

Finally CK got to some of the missing parts of the discussion. Without getting into it deeper it cannot be fully explained by dancing around the outside of the subject with only small parts of it being used for discussion. RF theroy never changes no matter what the antenna design is. No...