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Hi Dave Thanks for the input. Yes you are correct, this switch does have both "antennas" configured as an X and they are both always connected. The switch is based on the work of I8CVS. I should have

I was an organic chemistry major and graduated with my BS in the late-60s long before electronic calculators. (We had honking-big Marchant mechanical calculators in a room somewhere in the building

So this switch actually has BOTH antennas connected ALL the time for ALL modes, so the nominal 3 dB loss from the input to each antenna is present at all times. Be sure to terminate the antenna

On 2022-08-11 21:25, Jim Lux wrote: > On 8/11/22 12:13 PM, Glenn VE9GJ wrote: >> ?I recently finished building some Sat antenna polarity switches. (2M and 70CM) >> They switch between Horz, Vert, RH

This unit takes a single feedline from the Tx/Rx to two antenna ports. In linear pol, it should be a straight feed through one of the two antenna ports, with the other port terminated (or open, I

I recently finished building some Sat antenna polarity switches. (2M and 70CM) They switch between Horz, Vert, RH or LH polarization.

Thats nice. Its sliderule week. wrote:

I use my 4' Pickett when I need real precision.

Yes, that is the application of SWR circles on the Smith Chart. For example, any combination of R and ±jX so long as it lies on that 2:1 circle (real radius intersects at 25 and 100-ohms), the SWR /

Addition to my previous post: Whether you display the results on a Smith chart, or a standard XY chart, or a table, or whatever, doesn't matter at all! What matters is what you are displaying: SWR, or

SWR measurement can be done at any point of the line, even over a wide frequency range, and will be correct except for effects produced by line loss. The impedance instead will vary according to line

those are nice. you still have manual for one. Martin N6QLH wrote:

Well, here is mine! Complete with plastic case, original cardboard packing, and instruction manual! Replaced in 1982 by a Sharp EL-507 scientific calculator, which I still use... Manfred, XQ6FOD

All I remember is any good math teacher had a massive K&E slide rule hanging from the ceiling in the class room. More functions on it than most of us ever used at least in undergrad work. And then in

What kind of battery does it use, and where do you put it in? I hope they took the battery out years ago or it will be all corroded. Ha! Wish I had kept mine but being a poor student needed cash all

It's true for the SWR This is true at a fixed frequency but the nanaoVNA works at a variable frequency; it follows that the shape on the Smith is not the same over the length of the coaxial. It comes

Good, now take a current probe and do the same and you will get and ISWR. They are reciprocals. Once upon a time there was a myth that you must measure your antennas swr at the feedpoint. Not so. In a

Z(Source) has nothing to do with the case. Many are convinced and peddle the idea that, for there to be adaptation, the source must have an internal impedance equal to the characteristic impedance.

I'm not sure what is more amazing: 1) that someone donated it - or - 2) that whoever sorts through the donations and decides what to sell actually put it out for sale!

There are three of them over on that auction site, including a Russian version !! 73, Dick, W1KSZ ________________________________ Sent: Wednesday, August 10, 2022 6:25 PM To: [email protected]