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Latest Topics

Topic Created Posts Views Last Activity
Circuit Board Construction Question Mar 23rd 2012, 13:10 4 1,983 on 15/9/13
10 Meter AM Nov 14th 2011, 19:24 4 2,149 on 14/12/11
Baofeng UV-3R Harmonic Fix Nov 11th 2011, 14:18 1 2,069 on 11/11/11
Novice Trivia Question: 10 meters Oct 26th 2011, 18:55 2 1,623 on 1/11/11
European AM'er Needs Help Aug 25th 2011, 19:45 3 1,561 on 23/11/11
How to Set the Temperature Setting On a Soldering Station Aug 16th 2011, 12:18 1 2,126 on 16/8/11
How to Remove Cigarette Smoke from a Newer Solid State Transceiver? Aug 8th 2011, 18:15 6 3,544 on 19/4/14
Switching Open Wire Feedline Bewtween a Transmitter and Receiver? Aug 8th 2011, 13:34 1 2,204 on 8/8/11

Latest Posts

Topic Author Posted On
Diplexer Isolation WX1S 19 hours, 12 minutes ago
Our ARRL Laboratory limit for signal input is +10 dBm (10 mW). It is considered the highest "safe" signal input for test purposes.
Disband MAR section from all contests in favour of NS, NB, PEI VE1AWP 19 hours, 17 minutes ago
Message forwarded to ARRL Staff.

Thank you.
ARRL version of linux WA6SAZ 2 days ago
Quick Stats suggestion has been passed along to the ARRL Editorial Department
ITU 2 phone below the band plan? KC9UOQ 2 days, 23 hours ago
The US phone band is 7.125 to 7.300 MHz, period. However, other countries in ITU 2 are allowed to operate on lower frequencies than we can. Canadian Amateurs can do so, for example; they can be heard regularly on 7.060 to 7.090, or so. You cannot QSO with them using phone, unless the other station is operating "split" (listening somewhere in the US phone band). You could always call them using CW :)
Power Supply Causing Dirty CW Signal? kg4msr on 19/9/14

Try using a faster scan rate on the scope. You may have much higher frequency noise riding on the DC voltage that the filter capacitor is not taking out all the way. Noise like this sometimes cannot be seen while viewing ripple.

It's possible that one of the solid state devices (diode or regulator) is generating this while under load.

You can always contact Astron and ask what they may think is causing it.

Bob Allison
ARRL Laboratory

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