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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

I knew it.? After a couple of hours fiddling, I realized that you probably can't do it on the phone, and I was right.? Went to laptop and solved problem.? Sorry for troubling the group.? Doug

I have several groups.io groups that I haven't used in a long time.? ?How do I delete them

So glad!! Big props for them

You might want to look at https://www.swpc.noaa.gov/communities/radio-communications Paul

David, woohoo! 73, Eric NF6S ex WD6DBM ? On Mon, Jun 10, 2024 at 1:28 PM, David via groups.io<dkvarn@...> wrote: I sent a message to Steve (Alpha pres) with full set of pix and

I sent a message to Steve (Alpha pres) with full set of pix and received a reply within a few hours. Another tuning box will be sent right away along with a return label. He said that the boxes are

CME hitting today from M9.7 x ray flare on Saturday

On Mon, Jun 10, 2024 at 12:17, Doug Hendricks <[ki6ds1@...](mailto:On Mon, Jun 10, 2024 at 12:17, Doug Hendricks <<a href=)> wrote: > Not a signal to be heard here. What are you guys

Not a signal to be heard here.? What are you guys experiencing?

I prefer units, such as the (tr)uSDX, which does not have a built-in battery. ?That allows me to plug in batteries of varying voltages to safely check the SWR of portable antennas (or operate QRPp at

In theory, an FET subjected to an overvoltage condition goes into Avalanche Mode Breakdown, which is a region where the FET functions like a zener, with a wattage rating equal to the FET wattage

I discussed with Ed Fong (WB6IQN) concerns about installing an internal battery on these radios. You don't want the biggest Li+ pouch cell that will fit. They expand 10-12% radially as they age. You

Doug, I assume you are talking about the USDX radio’s battery. The (tr)uSDX has no internal battery. A charger came with my USDX. Since it is charging 11 V battery, I assume it is feeding 11-12V. I

On another topic how do you charge the internal battery?? What size plug, what is polarity?

Keeps the SD junction? voltage below 60v limit.? Diode conducts at 47v

How does the diode protect against high SWR? What is the theory? Hiroki AH6CY by