Re: [digitalradio] RFI-Free PCs?
Bill, What kind of RFI? The RFI was caused by the computer and picked up by the receiver. The noise level would rise a few S-units on HF when the unit was turned on. I tried two different desktops using an LCD monitor and the results were the same. One was a little noisier than the other. On the other hand, the Toshiba laptop I have is virtually noise-free and so was the one before it. My kids have a new Acer laptop and that proved to be very quiet as well. It seems odd that laptops (being mostly plasitc) would generate less noise than a metel cased desktop. Guess that's partly due to lousy components and shielding on the desktops I've tried. Thanks Bill... Tony -K2MO PS: What are you using in your shack? - Original Message - From: Bill Turner [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Saturday, March 22, 2008 6:26 AM Subject: Re: [digitalradio] RFI-Free PCs? ORIGINAL MESSAGE: On Fri, 21 Mar 2008 23:17:22 -0400, Tony [EMAIL PROTECTED] wrote: Need to replace the PC in the shack and would like to find something that's RFI-free out of the box. REPLY FOLLOWS What kind of RFI? RFI caused by the computer and picked up by your receiver or RFI caused by your transmitter and picked up by your computer? A couple of general observations: The first kind is caused mostly by the monitor, not the computer. Going to an LCD monitor, as you are, will cure most of that kind. The second is more difficult, but try to have the computer and transmitter physically close together with the two chassis bonded together with a short ground wire. Without that bonding wire, your interconnecting wiring creates a sort of small loop antenna. The bonding wire shorts it out. And best of all, if you can, is keep your antenna as far away from your equipment as possible, and use coax feedline instead of open wire. Use a balun at the junction of antenna and feedline to prevent current from flowing on the outside of the coax. Such current flows as a result of unbalance in the antenna system and is a major cause of RF-in-the-shack syndrome, which in turn is a major cause of computer RFI. 73, Bill W6WRT
Re: [digitalradio] RFI-Free PCs?
On Mar 21, 2008, at 11:17 PM, Tony wrote: All, Need to replace the PC in the shack and would like to find something that's RFI-free out of the box. I've had terrible luck with desktop PC's, but the last two laptops (Toshiba) were very quiet. I'm leaning towards something in the small-PC catagory with an LCD monitor. Sound card and multiple USB ports are a must. Any suggestions would be greatly appreciated. Tony -K2MO I am running a g4 mac mini, very small, solid aluminum case, no rfi at all. If you absolutely need to run windows, just get one of the intel versions and install it. -- Alex / AB2RC My rechargeable batteries are revolting.
[digitalradio] Re: [wsjtgroup] frequencies
Hi Vic Take a look at this page and you will see a lot of alternative WSPR frequency's http://www.electroblog.com/drsked/meptspots.php 73 de LA5VNA Steinar vic skrev: Any other bands in use with this program besides 30 meteters? Be nice to establish listening freq. besides 10.14015 thanks Victor -- vic [EMAIL PROTECTED] mailto:ke4lkq%40doramefa.us No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.8/1339 - Release Date: 3/22/2008 4:43 PM
Re: [digitalradio] RFI-Free PCs?
Is your display LCD or CRT? In my experience, CRT displays are sometimes a major source.
[digitalradio] Re: Fwd: [ARRL-LOTW] First International DominoEx Prefix Contest
--- In digitalradio@yahoogroups.com, Andrew O'Brien [EMAIL PROTECTED] wrote: -- Forwarded message -- From: John [EMAIL PROTECTED] Date: Jul 15, 2006 4:37 PM Subject: [ARRL-LOTW] First International DominoEx Prefix Contest To: [EMAIL PROTECTED] Any one know what mode designator would be best when uploading these QSO's to LoTW? 73 John ZL1BYZ. 1- Open TQSL (not TQSL CERT) 2- Select FILE PREFERENCES 3- Select ADIF MODES tab, then ADD 4- Type DOMINO in the ADIF mode window 5- Highlight DATA in the RESULTING MODE list. 6- Click OK 7- The window should show a line that says DOMIMO - DATA 8- Click OK Now sign your log and uload the resulting TQ8 file.
Re: [digitalradio] Any Nevada stations available for a RTTY QSO?
Hi David my name is Bill Dawson and my call is W7TVF and I must have missed you inquiry as I just noticed it today. I will be glad to work you on SSB, CW, or many of the digital modes. I am on 160 meters most of the time as I like to chase DX and the rarer the better. I have my antenna farm which I have been building for many years and now I just play and have fun with my 5 element phased array on 160 meters and is switchable to cover 360 degrees. I have 48, 000 feet of radials under it on the ground and even the birds have trouble walking. Give me a couple of times and frequencies or if you prefer just give me a time and frequency +- qrm or occupied and we will get you fixed up with your Nevada RTTY contact. Take care and 73, David Bill W7TVF - Original Message - From: David Kruh To: digitalradio@yahoogroups.com Sent: Wednesday, March 19, 2008 5:58 AM Subject: [digitalradio] Any Nevada stations available for a RTTY QSO? You're all I need for RTTY WAS! Please contact me direct at [EMAIL PROTECTED] to set up a sked! Thanks David -- No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1336 - Release Date: 3/20/2008 9:48 AM -- I am using the free version of SPAMfighter for private users. It has removed 512 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len
