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Harbach Electronics has started their own FB group. "This is a place for people to post pictures of their Harbach kit installs, Homebrew ham pa projects and brainstorm

That’s a SB-1000. Just showing the dirt on the strip that I pulled off the relay.

Hmmm alright. That doesn't look like a Commander HF-2500 with 3CX800A7s. ?

Hmmm, the relay is right there? I do want to clean the relay. I cut strips of paper, saturate them with DeoxIT, and clean the tint acts on the relays. They are almost always dirty.

No. Just remove the rear panel screws and fold the panel down to get to the relay/s. There's also the relay on the control board. Cheers, Alek.

Well, my goal was to just have the meters red in standby and green when ?out of standby but the 1 set of the poles are bad on the 2PDT standby switch. I don’t want colors changing between TX and

The solution is simple if you want the colours to change between Tx and Rx. Install another small SPDT relay in parallel with the keying relay and wire each strip through the contacts. 73, Alek

I guess the 15sec videos are not allowed. I’ll try to add a pic when I get home but it’s pretty cool.

So I installed 2 LED strips that draw 66mA each. I tried to utilize that standby DPDT but the one set of poles is shot. Anyway, I’m just running both strips, red and green. I may drop the voltage to

https://en.wikipedia.org/wiki/Root_mean_square Where it gets complicated is in this case -- F1AMM Fran?ois De la part de Kim Elmore Envoyé : vendredi 18 avril 2025 01:59

Thank you for sharing your attachment. I tried to find a link to this document online by searching in Google: "the power consumed by the bias source" The result is surprising and here are some

FB ON YR HB AM XMTR! DE ED, KI6DCB (Seventy-two years old and off-air until I build a new shack with acres of antennas (antennae? HI HI) ready to go. I'm going to be using Icom's excellent IC-275H,

It's average Watts, not RMS Watts. RMS Volts (0.707 peak) X RMS Current (0.707 peak) = Average Power 0.707 X 0.707 = 0.5 RMS Watts does not exist. There is peak power and average power but no RMS

Eimac data sheet does show 890 watts out, but the plate voltage needs to be 3500 at full load. The AL-80 amps do not have this much plate voltage. Unless you’re a CBer on 11M. Hi hi also, in Class

See https://en.wikipedia.org/wiki/Root_mean_square for the full treatise. 73, Kim N5OP

Power is RMS. Power can vary, but it's always RMS. The idea is that for sine wave AC, RMS voltage and current will dissipate the same power as the DC values for both. My digital vector RF watt meter

Keep in mind that a single sine wave cycle has an RMS value that is peak/1.414. 73, Kim Elmore

I believe those were peak *input* power levels. This is what upset AM fans so much when it was changed to 1500 W peak output, because they could get more than 1500 W peak? power with 2000 W peak

That's simply incorrect. Our voice "peaks" are very long, compared to the RF frequency, they they have do indeed have a running RMS value. "Peak" on a watt meter is the peak power, which is always

Grids don’t have enough thermal mass for protection like a plate has. Exceeding peak values are enough to blow out a grid. Many moons ago, I had a Henry 3-KA it had a pair of Eimac 3-500Zs had