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The best way to view the mismatch at the amp input is to look at a point on the Smith chart.? If the amp input impedance is not 50+j0, the point will NOT be at the center of the Smith chart.? It

Thanks, Adrian – a very good explanation ! I wrote an article on SWR for AR magazine many years ago. Covered the same ground. Cheers, John Sent: Wednesday, November 1, 2023 6:52 AM To:

John, Send me a personal email with the address to send it to. I got the address off of here, used this one... vk6jx@..." sent it but it bounced. Bob

Yep. Just to clarify, with 50 ohm coax/feedline, if the load is 50 ohms resistance with zero reactance, the SWR will not change. Bob W4JFA

Tnx Bob.... got it.? ?Into a 50 ohm DL..... swr is 1:1? ? regardless of coax length.? My guess is since the C1 and C2 caps in the tuned inputs are fixed...and only the coil is adjustable, there

Hi Bob – I would like to read that too, if you would put it on here or send it to me directly. Thanks ! John VK6JX Sent: Monday, October 30, 2023 8:44 PM To:

Gentlemen, If you can spare the time, calibrate your nanoVNA boxes and run some profiles on various coax jumpers. Setting up the IRIG-B network at work required any number of coax jumpers between

Phase angle. If the coax length does not matter, phasing lines would not work.

Jim, I sent you an email directly. The address copied kinda strange so not sure if you'll get it or not. Let me know. You'll be interested in reading. Not that long. Bob W4JFA [email protected]>

Jim, If a 50 ohm coax is NOT terminated into a 50R - j0 load, the impedance will change with length. Somewhat like using a 1/4 wave 75 ohm coax to match/change impedance of certain antennas. Now some

Hi Alek, I did consider that but I have some old AA5 radios, and an old Zenith floor radio to kinda restore so I will need it then. I said kinda restore because I don't really restore them, I just

Hi fellas For 24 out of my 41 years as an Electrical/Instrument Engineer, I worked in Alumina Refineries. Both of the refineries I worked in were owned by US companies. The first - Worsley Alumina,

Watch out with length of coax between xcvr + input of the amp.? ? On all 4 of my Drake L4B amps, if coax is 3' long, input swr is flat on all bands.? ?But when I use a 6' jumper, input swr

Don't we all know a million places we can buy jumpers if we want to ?

Sounds like a true ham shack Bob. Congratulations. Another thing to consider is the actual need for a tube tester. How often do you use it and how often are you likely to use it in the next 10

Jim, My shack/shop inside is getting cramped! I know it doesn't sound like it would save much space but it will. Thanks, Bob W4JFA

Store it inside the home.? ?If you store it outside, it will end up with mildew, condensation etc, on everything.? ?IF it has to be stored outdoors,? I would put it in a sealed container, packed

I got some answers emailed direct saying leave it inside. I've had electronic equipment in a garage for years with no issues but I thought I'd ask about an old tube tester. It'll stay inside. 73, Bob

Hi all Today I found a pre-made 6-foot RG-58 cable at <americanradiosupply.com> with UHF connectors. USD$13.49 or thereabouts, soec-ed at 66% velocity factor. It's an easy and relatively cheap way

No electronic equipment will do very well in an uncontrolled environment. Also, I certainly would not wrap it in plastic, which will trap moisture. Cloth like a bedsheet would be a much better