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

Latest Topics

Topic Created Posts Views Last Activity
Circuit Board Construction Question Mar 23rd 2012, 13:10 4 2,150 on 15/9/13
10 Meter AM Nov 14th 2011, 19:24 4 2,286 on 14/12/11
Baofeng UV-3R Harmonic Fix Nov 11th 2011, 14:18 1 2,194 on 11/11/11
Novice Trivia Question: 10 meters Oct 26th 2011, 18:55 2 1,746 on 1/11/11
European AM'er Needs Help Aug 25th 2011, 19:45 3 1,667 on 23/11/11
How to Set the Temperature Setting On a Soldering Station Aug 16th 2011, 12:18 1 2,328 on 16/8/11
How to Remove Cigarette Smoke from a Newer Solid State Transceiver? Aug 8th 2011, 18:15 6 3,825 on 19/4/14
Switching Open Wire Feedline Bewtween a Transmitter and Receiver? Aug 8th 2011, 13:34 1 2,360 on 8/8/11

Latest Posts

Topic Author Posted On
Chimney Mount KK6OZV 3 weeks, 2 days ago
If your chimney is made of brick and has internal ceramic flue pipes, then you could use such a mount without fear of melting coax. However,, the chimney must be in excellent physical condition before mounting an antenna in it. Antennas tend to be rough on chimneys during wind storms, so the condition of the chimney must be monitored frequently. Also, check with your local zoning laws to see if such an installation is allowed. I have heard that due to safety considerations (falling brick), chimney mounts are no longer allowed in new installations.
The Prius & RFI / EMI Problems? K7SED on 24/12/14

Please email Steve directly, as he normally does not view our forums. The Lab staff reviews the forums on a regular basis.

Bob Allison
ARRL Laboratory
MFJ-949E Tuner with Comet SBB-5 AF9U on 7/11/14
Dear Drennen,

Check the specification of the MFJ-949E. You will see the tuner is designed to operate between 1.8 and 30 MHz. It will not work on 2 meters.

A good rule of thumb is to use a resonant antenna, when possible, so no antenna tuner is needed. There is no need to add a tuner if your mag mount antenna works well without one.

I used to use the same type of antenna when I lived in an apartment back in the 80's. I had a Larsen mag mount on top of a well seasoned baking pan. The outfit was placed on a flat roof, about 10 feet away from my shack window. It worked great.

Have fun,


Bob Allison
ARRL Senior Test Engineer
Antenna Polarization for FM contesting Gringo6 on 4/11/14
If FM is all you have, FM polarization is fine.

I appreciate FM operators during VHF QSO parties. FM contacts added to my overall score, each time I have participated. During lulls in the event, I always check out the 2 meter FM simplex frequencies (excluding 146.520 MHz). Those 20 or so extra QSOs can add to a serious contester's score.

It would be nice to see some new participants during contests. Maybe we should have an FM only catagory?
Diplexer Isolation WX1S on 29/10/14
Our ARRL Laboratory limit for signal input is +10 dBm (10 mW). It is considered the highest "safe" signal input for test purposes.

Back to Top