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QST Downloads Feb 19th, 16:34 1 149 on 19/2/16
March 2016 QST Compact Multiband Dipole Feb 19th, 15:23 1 184 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,173 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 2,525 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,908 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,762 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,964 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,024 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,886 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,533 on 13/9/11

Latest Posts

Topic Author Posted On
programming software. kwham 9 hours, 54 minutes ago
RT Systems sells a suite of programs for programming radios of nearly every manufacturer.

inverted v leroy271 1 day, 9 hours ago
This is what I use--optimized common mode chokes. A resonant inverted V typically has an impedance close to 50 ohms, so no impedance transformation is needed.

You have to be very careful when using a ferrite balun with a multiband tuner fed dipole or inverted Vee--the tuner can force power into the balun it really can't handle--the balun will heat up and the SWR will drift--it isn't unusual for the balun to burn up. Buying a kW balun and using it at 100 watts actually won't stop this from happening--the kW rating is a "best" case rating, not a "worst" case rating.

Zack W1VT
Contesting Reporting and LoTw Coordination WA9ZVF 1 day, 12 hours ago
My LoTW confirmation percentage is over 70%
26757 QSLs and 37921 QSO records.

Contesters and DXers have different standards as to what constitutes a valid contact--for many, when a contest ends, you are suppose to submit your log--no fixing call signs, even if someone emails you the correct call. But, many DXers do allow the correction of minor errors in copying callsigns.

Zack W1VT
ARRL Senior Lab Engineer
h) Post-contest correcting of call signs by using any database, recordings or confirming QSO's is not allowed.
Help finding q and k table for an Optimum L filter W8AVD 1 day, 12 hours ago
inverted v leroy271 2 days, 12 hours ago
I have a 15M dipole that needs a balun to prevent picking up excessive noise on receive. I did comparisons with a 10M dipole/tuner running parallel a few feet away which had a balun that did not pick up an intermittent noise source. When I put on a balun with about a foot of vertical coax between the feedpoint and the balun, I could pick up just a little bit of noise. Putting the balun or choke isolator right at the feed eliminated the noise.

Zack Lau W1VT
ARRL Senior Lab Engineer

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