|Joined:||Sat, Apr 4th 1998, 00:00||Roles:||N/A||Moderates:||N/A|
|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|
|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.
|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.
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