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Do all the coils look the same or is the 20 meter coil different? Bob W4JFA [email protected]> wrote:

There ?are no??adjustable caps, only the slugs are adjustable. ?If you don’t feel the slug someone could have ran it all the way in and if fell out of the slug. ? Sent from the all new AOL app

I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power

Maybe you can make a short jumper with some L or C (which ever's needed) to tune out the reactance at those UHF freqs? Bob W4JFA [email protected]> wrote:

In? lieu of a DL, what else that works is.....? 160m at high noon......and 10m at midnight. On 40m, just find some SW AM broadcast station, and tune all you want.

I gave up the oil loads years ago. Also supposed to use a special silicone oil which is not cheap. I use air cooled loads, this one came out of the att ship to shore site in ocean gate New Jersey.

Scott, I wonder if the resistor may have been replaced with one from a contaminated load or a water load, not knowing the history on it makes it a Sherlock Holmes case. Measuring near 50 Ohms dc does

It is an "exponentially tapered" section.? I can send a picture of the load assembly if that would help with suggestions.

Um, no.? Thanks anyway.

The transition from "N" to the load should be a tapered "constant impedance" section.... not a flat plate which is fine to around 100mhz. Don Roden Links: ------

The length of the coax between your dummy load and the test source is likely the culprit. Try various lengths of coax. 73, Dave, w6de Sent: 11 June, 2024 20:40 To: [email protected] Subject:

Peripherally related... I have a new-to-me Bird 8890 load.? It's rated VSWR 1.1:1 to 1 GHz, but sweeps substantially worse, rising to nearly 3:1 at 435 MHz. I've taken the load assembly out of the

Have a factory made 8k ultra with spare plate transformer on the way. If not to screwed up I will fix and re sell. If beyond repair I will strip and part out. Stay tuned to my YouTube channel under

Yeah. You're right Jim.I hadn't thought it through that far and you're right about the many handy applications. I use them a lot. Alek VK6APK.

Yep. I got a couple of those surplus boards many years ago and I use the couplers in lots of applications. Amplifier keying relay between radio and amp, bias cutoff resistor shorting relay in grounded

Alek, I don't think the opto idea would work.? ?All the resistors are in series, and regardless of value..... the current is the same. (current in a series circuit is the same). IE: say 7500 vdc

In another lifetime, we used OPTO22's for most of our control work where PLCs were involved. They used to make pre-printed circuit boards where you could get 5X, 10X or 20X units on a board. At a

My protection board for the 160-15 meter pa uses opto’s. Nice thing is they are super fast.

Opto devices are pretty cool, but its like a technology that all of sudded blew up overnight and as soon as it came on with so much popularity it almost seems as if they dropped off with popularity

This is for when the HV fuse in the B+? opens up = zero B+.? ? ?With no B+...and drive applied, you will peg the grid current meter.? A grid over current would achieve the same result, shut it