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There has been two people caught broadcasting on FM in the last 30 days. One in FLA an one in CA. One in AK using illegal CB equipment putting out interference in the aviation band. Didn't take them long to jump on that one.

This subject keeps getting repeated over and over because those who don't know, will not or cannot understand the reasons for amplifier operation in class A, B and C. Those who know are not listened to by those who do not know so the foolishness keeps rolling on and on. FOR SSB; . Class C...

Most modern production amplifiers worth amateur retail sales are designed with RF tight cabninets. If the connecting cables are good and the amplifier is not run into excessive SWR so that a lot of common mode RF appears on the outside from the cables, there should be no issues. As well, the...

Anyone see what's wrong with that circuit? It's suppoed to be a grounded grid circuit but in transmitt where is the kathode going when switched over to driving radio? If you have no RF circuit knowledge, leave it alone. The original designer hardly knew what he was doing!

Consider using a Balun to tranfer from Coax to open wire feedline near the tuner. When the antenna does not tune well on a band, the losses in the open wire are a lot less than in a short peice of coax. 3 to 1 missmatch is not too bad but say 10 to 1 is a setup for a lot of loss, so minimize...

The antenna is a 'BANDPASS" log periodic design. The feed is 180 degree crossovers feeding dipoles that are staggered tuned in electical length to have a broad bandwidth. A Balun of sorts is needed to feed it with 50 ohm coax. The Coax Balun shows quite clearly as does the crossover feed...

What the big amount of capacity is doing is more regulation of the output voltage under load current demands. Here is the way it works. With the big cap in place, the power peaks are being fed out of the stored capacitor current and helping the supply to be more stable in output by not...

Only way these people are ever going to understand amplifier biasing is to attend a class and be shown the plots of drive signal in vs the resulting signal out for the various bias modes and given the handout sheets to take home and look at again.. When this is shown then try the argument that...

If your power supply has an adjustable Crow Bar circuit it may be adjusted too low or is faulty. The lamp may well draw less than 5 amps but if the Crow Bar circuit does not like the current spike level at inital power up when the resistance is lower it may well kick it off/out. These supplies...

Old thread but here is some more experience with the 6 element Gizzy on 11m many years ago. The change in polairity when facing another conventional beam config at a distance resulted is no change in signal levels such as at a PDL-II on the other end of the test.. On DX it seemed to do very...

Spend about $150 for a supply like a Diamond GZV4000 and get adjustable output 5 to 15 at 35 to 40 amps. What you have has no capabilty to offer the current you want, in any form.

What difference did you expect to see? From 50 mhz down, you would hardly see any difference on an SWR meter. Signal wise you would not see or hear any diffeence unless there was a serious fault with the connector or the installation.

You asked, what the impedence is at 27 mhz? Of what, the connector or coax? The question is NA. A feedline made for nominal 50 ohms impedence is 'not frequency sensitive'. To prove this, take a feedline and terminate it with a flat 50 ohm resistive load. At any frequency below the coax and...

I can a-sure you that the impedence 'looking into or out of' the radio through the connector is not set by the connector. Reading something from a source is one thing, understanding it is another. You just can't run with something you read, unless you do. It's not that simple. Consider that...

Hello Mike, your only 35 miles RF wise from me to the south. I work a lot of 2 meter side band and could hear you i'm sure and just got my 432 SSB system running. On monday nites, the radio club Pakratts does a net starting on 6 meter going all the way to 1296 and beyond if anyone wants. Get...

What's your call instead of using a handle?

3985 is a broadcast frequency as well as 3975. Yes, on 75m there are broadcast stations using this band. We hear them in the east. Someone was on calling CQ but was all distorted.

Most power meters display the average power unless a peak reading circuit is switched in. An analoge meter cannot follow the RF waveform at an audio rate and display anything but an average of that 'complex' waveform. A analoge meter's balistics has to be dampened to limit 'over swing' so...

This is what happens when conduction angle is not known about or understood. The term 'Linear' cannot be applied to a class C biased amplifier. Set to Class C, an amplifier will never amplify making the output signal a clean 'linear' copy of the input signal on SSB and likely not very well on...

little joe, it doesn't work that way. In the CB, both the radio's driver and the final stages are being modulated with audio. If you turn down the power, the same audio is still trying to drive those stages, so they become overdriven from being turned down. The amplifier design may not be...