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Latest Posts

Topic Author Posted On
Sears Antenna Matcher KawBob on 17/5/22
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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