|Joined:||Sat, Apr 4th 1998, 00:00||Roles:||N/A||Moderates:||N/A|
|Circuit Board Construction Question||Mar 23rd 2012, 13:10||4||1,617||on 15/9/13|
|10 Meter AM||Nov 14th 2011, 19:24||4||1,832||on 14/12/11|
|Baofeng UV-3R Harmonic Fix||Nov 11th 2011, 14:18||1||1,710||on 11/11/11|
|Novice Trivia Question: 10 meters||Oct 26th 2011, 18:55||2||1,323||on 1/11/11|
|European AM'er Needs Help||Aug 25th 2011, 19:45||3||1,301||on 23/11/11|
|How to Set the Temperature Setting On a Soldering Station||Aug 16th 2011, 12:18||1||1,631||on 16/8/11|
|How to Remove Cigarette Smoke from a Newer Solid State Transceiver?||Aug 8th 2011, 18:15||5||2,846||on 6/2/12|
|Switching Open Wire Feedline Bewtween a Transmitter and Receiver?||Aug 8th 2011, 13:34||1||1,888||on 8/8/11|
|Stuff on 3840||W7WHY||5 days, 11 hours ago|
Without going into details, I can that the activity on that frequency has been noted. Those in position that can do something about it have been informed.
ARRL Test Engineer
|PSK31 Operation||KK4WVG||1 week, 4 days ago|
|You can also operate PSK-31 on 6 meters (above 50.1 MHz) and 2 meters (above 144.1 MHz) as a technician.
I have heard PSK activity around 50.250 MHz and some activity a little above or below 144.200 MHz. Of course, PSK31and all other data transmissions are allowed on higher bands, but you probably will not find any activity there.
|ARRL version of linux||WA6SAZ||on 20/12/13|
|This may be a good idea, but where will the ARRL get the funding to launch such a huge project? The ARRL is a not-for-profit organization which is fortunate enough to just break even, most years.
You should be explaining your idea to your ARRL Division Director. The Board of (volunteer) Directors direct the staff and control where the money is spent. They are always looking for new ways to push technology ahead for Amateur Radio and are charged with the duty of preserving Amateur Radio.
ARRL Test Engineer
|Drake TR-4 "hum" when transmiting SSB||Howard60||on 18/11/13|
You may have a bad audio cable, which will cause hum in the audio. To check for this, press the PTT button and listen on another receiver with the RF gain turned down sufficiently. If hum is present, disconnect the microphone and key the PTT line with a jack and a clip lead (use caution, only do this with one hand behind your back). When keyed with no microphone, if the hum goes away, the microphone cord is defective, or possibly the microphone itself is bad. Try another microphone. Get another local ham to listen to your signal, if possible.
The other cause of hum would be if your High Voltage filter (electrolytic) capacitors in the power supply are tired. Try sending in CW mode, with the key held down for a few seconds (use a dummy load so not to cause interference) and listen on another receiver. If the note is not pure and has a flutter or ripple to it, the HV capacitors need replacing.
Or, your old Drake just doesn't know the words......
ARRL Test Engineer
disconnect your microphone and see if you can manually key the PTT line. While keyed, listen on another receiver with the RF gain turned down sufficiently.
|Hi Fi AM||kc2ifr||on 14/11/13|
There is no limit on bandwidth. One must use good engineering practices. That means, if the band is crowded, it's not exactly good engineering practices to take up a large portion of the radio dial. If it's the middle of the day and the (75M) band is quiet, then it can be fun to experiment a bit. When the band is crowded, it makes more sense to roll off the higher frequencies and concentrate the bandwidth for more effective communication.
The best way to "see" the transmitted bandwidth is with a spectrum analyzer. It's a bit harder to determine the transmitted bandwidth by ear using a receiver only..
As far as the name calling goes, that's not good operating practice and it gives the wrong image of Amateur Radio in the eyes of non-Amateurs. It's fodder for commercial interests that we misuse the airwaves and our frequencies should go to the highest bidder.