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Last Saturday during the VHF contest I heard some ops on 2m QSY to 6m, fm, 52.525. so that's 2. Otherwise, yeah all the action is FT8, 50.313. no CW, SSB, AM. Shame, waste of 4MHz. Contest wise, the

And can anyone give me a reason not to install the diode?? I'm trying to learn

The diode is between drain and source on fet.? Source is ground.can you explain why it works??

There are two different mechanisms for reverse breakdown in diodes: zener and avalanche.? Generally diodes with low reverse breakdown are in the zener mode and diodes with higher breakdown voltages

It gets back to the question: is the Avalanche Breakdown characteristic of the FET more delicate than that of a 1 watt zener. Maybe the 1 watt zener is tougher than the FET. Counterintuitive results

The zener in the video is connected across the FET, between source and drain. That zener is definitely not subjected to RF AC output voltage. [email protected]> wrote:

Doesn't Hiroki's video disprove that?

There's another possibility: the zener is so weak, it blows open the instant the transmitter comes on. [email protected]> wrote:

Here is an empirical proof to show how a single 1N4756 zener diode actually protects against high SWR. I ordered a bag of 10 1N4756As. I won’t need all of them. Anyone who needs one would be welcome

There are pictures of both rigs with diode installed at the beginning of this thread.

My guess is, it isn't across the RF output. [email protected]> wrote:

Guys, first of all I am not an engineer.? ?Please go to trusdx forum and do a search for 1n4756a.? Read the posting by Sars.? He says no I'll effects, i.e. spurious or harmonics generated.? ?Our

Oops. I tend to give people the benefit of the doubt. It begs the question, where was that zener really connected? [email protected]> wrote:

I built a 6 meter rig back in high school.? I had a WA8 call and collected QSL cards from 20 states.? Then I move to CA and channel 2 TV brought that to an end. Last year, I got motivated to get

I totally agree.? With the one diode as originally proposed, it would clip the waveform and generate harmonics.

Cooy and paste from above: " I? strongly encourage you to install a 1N4756A diode between rf and ground."

David: you would be correct, if the zener were placed across the RF output. Then it wouldn't work at all. The zener would probably blow right away. I got the impression this zener was placed in

My understanding is that a Zener diode "Zeners" in the reverse direction, but acts as a regular silicon diode in the forward direction, i.e., with a nominal 0.7 V forward drop. Since the transmitter

...meters, that is. I have a vintage Heathkit SB-110A 6-meter transceiver that I purchased c. 2000 and am considering selling on ePay. I was hoping to get it going for the first time this past weekend

Does anyone have any experience with this antenna?? I would love to hear about it.? Doug