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WB1GCM

Joined: Sat, Apr 4th 1998, 00:00 Roles: Super Moderator Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Circuit Board Construction Question Mar 23rd 2012, 13:10 4 4,449 on 15/9/13
10 Meter AM Nov 14th 2011, 19:24 4 4,638 on 14/12/11
Baofeng UV-3R Harmonic Fix Nov 11th 2011, 14:18 1 4,944 on 11/11/11
Novice Trivia Question: 10 meters Oct 26th 2011, 18:55 2 3,856 on 1/11/11
European AM'er Needs Help Aug 25th 2011, 19:45 3 3,819 on 23/11/11
How to Set the Temperature Setting On a Soldering Station Aug 16th 2011, 12:18 1 5,553 on 16/8/11
How to Remove Cigarette Smoke from a Newer Solid State Transceiver? Aug 8th 2011, 18:15 10 11,706 on 27/3/19
Switching Open Wire Feedline Bewtween a Transmitter and Receiver? Aug 8th 2011, 13:34 1 5,387 on 8/8/11

Latest Posts

Topic Author Posted On
WAS endorsement delays N0YO 1 day, 4 hours ago
You can always call HQ 860-594-0200 and ask for the awards department. The staff is at your service for such concerns and you'll get an answer faster.
Contact Stamp Question K5CKS 5 days, 23 hours ago
The ARRL Headquarters staff is coping with a high volume of requests and a reduced staff, due to the pandemic. Please be patient. I am forwarding this thread to the appropriate supervisor.
Nothing works as described?? WA5TEF 5 days, 23 hours ago
I have heard that changes made to HRD causes issues; try reviewing this link from HRD; it should help:

http://www.hrdlog.net/docs/Lotw.aspx

Desense Issue BaoFeng2020 2 weeks, 5 days ago
The de-sense effect may be happening not in your repeater, but in the handheld that you are using to test the repeater. If you are listening to the output on you handheld while you are close to your repeater, your handheld will de-sense from the transmitter of the repeater. A 25 Watt repeater that is only 600 kHz away from the frequency you're listening on can de-sense an inexpensive radio. De-sensing of inexpensive handhelds caused by stations close to the tuned frequency is quite common. Try another radio of good known quality, first.

Also, if the tuning of the repeater's duplexer cavities is off just a little bit (caused by mechanical vibrations, dropping it a few inches, or by someone trying to tune it by ear), it will de-sense the receiver of the repeater. Tuning the cavities for maximum rejection should be done while viewing a spectrum analyzer.

Bob Allison
WB1GCM
ARRL Lab Assistant Manager
How likely am I to cause RFI to Direct TV connected to Digital TV sets on 40 meters? WB6WUW 3 weeks, 1 day ago
I have an inverted "L" antenna that I load up on 160 through 6 meters. Our ground system is the city water system; 1/2 mile by 1/4 mile grid of underground copper and iron piping. Works great to the northeast for European and Russian DX. The point is, the horizontal part of the L runs less than two feet away from our Direct TV antenna. Maximum power used at this QTH is 125 Watts carrier (AM), (500 W PEP) and NO RFI. You may get RFI in some speaker leads; there are toroids for than.

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