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Latest Posts

Topic Author Posted On
Sears Antenna Matcher KawBob 13 hours, 53 minutes ago
I'm not much help, but in my 48 years of hamming, I've never seen one at ham flea markets, etc. It must have had a very limited run, intended to match a limited range of impedance, at 11 meters, rated at no more than 10-20 Watts. It may still be of use for 12 through 10 meters, QRP. Its value is in its obscurity.

I could find no information about it, other than a photo, on the web.

Cheers, 73,

2 kHz third order dynamic range on TS-590S KR2F on 23/3/21
You are very welcome!

Bob Allison
ARRL Test Engineer
Best Way to Ground a QRP Radio in the Field K0JNR on 22/3/21
For portable operations; if using a dipole, a ground is not needed. If using an end fed wire, a counterpoise is needed. The counterpoise can be a single wire, cut to a quarter wave on the frequency used.
2 kHz third order dynamic range on TS-590S KR2F on 22/3/21
The ARRL Test Engineer says that unless you have a high gain antenna, atop of a tower, you may not have enough signal voltage at the antenna jack to warrant a 3 IMD DR of over 100 dB (I've seen contest & DX stations that need 100+ dB). If you have a G5RV, a vertical, or a 3L beam, you will never experience IMD, unless you have two very strong local stations on at the same time, spaced evenly apart in frequency (2&4 kHz away, in this example). Granted, signals can be very strong on the lower bands (160 & 80 meters), but the IMD products, if any, are usually far below the local noise floor (not receiver noise floor).
cw proficinty wb3hus on 19/3/21
The Code used is the International Morse Code. It is the same code as practice sessions and the ARRL Qualifying Runs (proficiency). 99.9 percent of the operators heard on-air in CW mode use this code. There may be still a few old brass pounders out there who do the American Morse code, which is a holdover from railroad telegraphy, but perfectly legal to use. .

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