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?
Bill, I haven't been following this thread, but THANKS! You've answered several questions that I had! Now I have a question: I have an 11-meter rig in my shack (Sorry guys, but I started in CB LONG before I became a Ham and that was in 1981) that has HALF SCALE noise! I also have the same problem with my 10-meter rig! So basically, they are both useless! I've turned off all my cordless phones, computers and anything else I can think of that would cause this, but it still exists. I live in a residential area so there are houses all around me. I'm HOPING that the problem is in MY house and not in someone else's house, that way I can locate and fix the problem! Any ideas on WHAT could be generating this noise? Rod KC7CJO Bill Turner [EMAIL PROTECTED] wrote: 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 - Never miss a thing. Make Yahoo your homepage.
[digitalradio] Re: RFI-Free PCs?
I agree on building your own PC. I built one using a cheapie case and power supply and it was pretty quiet. So I ordered another case and power supply, same catalog number from the same supplier, and what came was a bit different. The power supply was the worst broad-band noise generator I have ever met, even when the computer was turned off. I've been told that Antec makes good power supplies and boxes. On the other problem, high noise on CB and 10 meters, I've found that a battery-operated portable shortwave receiver is a great tool. I had a lot of trouble at first with power line noise. The power company was cooperative but not very skilled in finding it. I could walk around with the battery receiver and find the noise hot spots and then they could find the faulty line hardware. I read somewhere that your house is a high noise zone, and if you get about 15 feet away things get much quieter. I haven't yet got around to trying that with the portable SW receiver. I'm told that even wall-wart power supplies these days generate RF noise. Touch lamps are known to be a bad source of noise. One of my friends says to turn off Everything in the house, unplug all the wall warts, and see what kind of noise you have, and then put things back on one-by-one.
Re: [digitalradio] ALE400 Testing 3584kc USB
Hello to all, To leave a mail to John, start the Aux. fonctions window and add VE5MU to your callsign list: - Write VE5MU in the edit label where it is written Call - click on the buttonAdd this call to the list - click on the button Lits up-to-date Select VE5MU in the addressee list (combobox), Write a message in the ARQ FAE mail to send. Click on the button Send mail (+ file) and let the program send automatically the mail to John (abandon after one minute in case of poor propagation). There is a Word document which goal is to show from Multipsk snapshots how to do the basic operations in ALE and ALE400. This document (1.1 Mo) is available from my site site http://f6cte.free.fr/ALE_and_ALE400_easy_with_Multipsk.doc; (copy and paste this adress in Internet Explorer (or equivalent) Net adress field). 73 Patrick - Original Message - From: John Bradley To: digitalradio@yahoogroups.com Sent: Friday, March 21, 2008 5:23 PM Subject: [digitalradio] ALE400 Testing 3584kc USB from 1600Z Friday to Z Sunday, VE5MU will be on 3584 USB running ALE 400. 1500 hz center .QRZ and HFN enabled for soundings please connect using the Mail function, leave your name ,address and signal report, and I will forward you a genuine VE5MU QSL card directly. These might be collector's items. someday john VE5MU
[digitalradio] Whispering on 30m captured in Norway
1510 1 -24 0.3 10.14012921.9 1510 3 -14 0.2 10.140140 TF3HZ HP94 35 21.9 1512 1 -18 0.3 10.140140 TF3HZ HP94 35 21.5 1514 6 -15 0.3 10.140140 TF3HZ HP94 35 22.6 1516 3 -12 0.3 10.140141 TF3HZ HP94 35 22.4 1518 2 -11 0.2 10.140141 TF3HZ HP94 35 21.5 1520 1 -11 0.3 10.140141 TF3HZ HP94 35 22.7 1524 7 -13 0.3 10.140141 TF3HZ HP94 35 23.7 1528 6 -13 0.3 10.140141 TF3HZ HP94 35 23.3 1530 2 -23 0.4 10.140130 OZ1PIF JO65 3022.7 1530 1 -10 0.3 10.140141 TF3HZ HP94 35 22.7 1532 2 -12 0.3 10.140141 TF3HZ HP94 35 22.9 1536 5 -11 0.3 10.140140 TF3HZ HP94 35 22.5 1540 7 -9 0.3 10.140141 TF3HZ HP94 35 23.4 1544 4 -10 0.3 10.140141 TF3HZ HP94 35 22.3 1546 3 -10 0.3 10.140141 TF3HZ HP94 35 19.9 1548 3 -8 0.2 10.140141 TF3HZ HP94 35 20.4 1550 7 -7 0.3 10.140141 TF3HZ HP94 35 20.8 1552 4 -8 0.3 10.140141 TF3HZ HP94 35 20.7 1554 6 -7 0.2 10.140141 TF3HZ HP94 35 20.8 1556 2 -8 0.2 10.140141 TF3HZ HP94 35 21.1 1600 1 -22 0.3 10.140129 OZ1PIF JO65 3022.1 1600 3 -6 0.1 10.140141 TF3HZ HP94 35 22.1 1602 6 -7 0.3 10.140141 TF3HZ HP94 35 21.0 1604 1 -7 0.2 10.140141 TF3HZ HP94 35 21.3 1606 4 -6 0.2 10.140141 TF3HZ HP94 35 21.7 1608 8 -7 0.1 10.140141 TF3HZ HP94 35 20.9 1610 10 -6 0.1 10.140141 TF3HZ HP94 35 21.6 1612 6 -5 0.1 10.140141 TF3HZ HP94 35 22.1 1614 9 -5 0.1 10.140141 TF3HZ HP94 35 22.2 1616 7 -5 0.3 10.140141 TF3HZ HP94 35 22.1 1618 9 -5 0.1 10.140141 TF3HZ HP94 35 21.9 1620 2 -6 0.3 10.140141 TF3HZ HP94 35 21.3 1622 1 -20 0.3 10.14012922.1 1622 4 -5 0.3 10.140141 TF3HZ HP94 35 22.1 1624 7 -7 0.3 10.140141 TF3HZ HP94 35 22.2 1626 2 -22 0.4 10.140129 OZ1PIF JO65 3021.7 1626 7 -6 0.5 10.140141 TF3HZ HP94 35 21.7 1628 6 -5 0.3 10.140141 TF3HZ HP94 35 22.1 1630 3 -22 0.4 10.140129 OZ1PIF JO65 3022.3 1630 7 -5 0.4 10.140141 TF3HZ HP94 35 22.3 1632 5 -10 0.4 10.140094 F8RZ IN95 30 22.0 1632 4 -6 0.2 10.140141 TF3HZ HP94 35 22.0 1634 7 -22 0.4 10.140129 OZ1PIF JO65 3021.5 1634 5 -7 0.4 10.140141 TF3HZ HP94 35 21.5 1636 5 -10 0.3 10.140141 TF3HZ HP94 35 20.9 1638 19 5 0.2 10.140094 F8RZ IN95 30 26.0 1640 7 -11 0.3 10.140141 TF3HZ HP94 35 20.0 1642 20 5 0.4 10.140094 F8RZ IN95 30 25.8 1644 20 5 0.0 10.140094 F8RZ IN95 30 25.8 1644 4 -11 0.3 10.140141 TF3HZ HP94 35 25.8 1646 7 -5 0.3 10.140141 TF3HZ HP94 35 22.2 1648 6 -7 0.4 10.140141 TF3HZ HP94 35 21.3 1650 19 3 0.0 10.140094 F8RZ IN95 30 25.7 1652 8 -5 0.3 10.140141 TF3HZ HP94 35 22.6 1654 17 5 0.1 10.140094 F8RZ IN95 30 25.9 1658 2 -9 0.3 10.140141 TF3HZ HP94 30 20.0 1700 5 -12 0.4 10.140141 TF3HZ HP94 30 18.3 1702 5 -12 0.2 10.140141 TF3HZ HP94 30 18.8 1704 5 -12 0.2 10.140141 TF3HZ HP94 30 18.2 1706 5 -14 0.3 10.140140 TF3HZ HP94 30 20.3 1708 11 -8 0.4 10.140140 TF3HZ HP94 30 21.1 1710 2 -13 0.2 10.140140 TF3HZ HP94 30 23.0 1712 4 -17 0.1 10.140140 TF3HZ HP94 30 23.8 1716 1 -13 0.1 10.140094 F8RZ IN95 30 24.8 1720 8 -11 0.3 10.140140 TF3HZ HP94 30 23.4 1732 8 -9 0.0 10.140094 F8RZ IN95 30 25.2 1734 20 1 0.1 10.140094 F8RZ IN95 30 25.6 1734 1 -11 0.4 10.140140 TF3HZ HP94 30 25.6 1736 5 -9 0.3 10.140140 TF3HZ HP94 30 23.3 1742 4 -11 0.3 10.140141 TF3HZ HP94 30 22.0 1744 1 -16 0.3 10.14014123.6 1746 3 -19 0.3 10.14014124.6 1750 3 -15 0.3 10.140141 TF3HZ HP94 30 23.1 1752 4 -8 0.2 10.140141 TF3HZ HP94 30 22.2 1754 6 -4 0.3 10.140141 TF3HZ HP94 30 23.1 1758 3 -11 0.1 10.140141 TF3HZ HP94 30 23.4 1800 4 -16 0.1 10.140141 TF3HZ HP94 30 23.5 1802 9 -9 0.3 10.140141 TF3HZ HP94 30 22.4 1806 2 -22 0.1 10.14014024.5 1808 5 -16 0.2 10.140140 TF3HZ
[digitalradio] NEW GUI version of WSPR just released
New GUI-based version 0.4 of WSPR now available at http://physics.princeton.edu/pulsar/K1JT/ -- Andy K3UK www.obriensweb.com (QSL via N2RJ)
Re: [digitalradio] NEW GUI version of WSPR just released
Hi Strange, I got this message msvcr71.dll could not be extracted! when I try to execute the program. 73 de LA5VNA Steinar Andrew O'Brien skrev: New GUI-based version 0.4 of WSPR now available at http://physics.princeton.edu/pulsar/K1JT/ http://physics.princeton.edu/pulsar/K1JT/ -- Andy K3UK www.obriensweb.com (QSL via N2RJ) No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date: 3/21/2008 5:52 PM
[digitalradio] ZF2NU DXpedition (all next week)
We will be QRV on Grand Cayman Island starting Easter Monday for one week. We plan to operate digital modes using fldigi and an Elecraft K3/100 to a Cushcraft R6 20-6 and a long-wire on on 40m. More details and QRV schedules for other events linked from http://www.QRZ.com/ZF2NU We will be doing casual PSK31 operations, but are especially seeking MFSK16 photo mode contacts so we can send beach photos, so please read up on how your program does it: fldigi: http://www.w1hkj.com/FldigiHelp/MFSKpix.html MultiPSK: http://f6cte.free.fr/SSTV_IN_MFSK16_EASY_WITH_MULTIPSK.doc Mixw/other: http://www.projectsandparts.com/lastsunday/mfsk16.html http://www.obriensweb.com/narrowsstv.htm (search for MFSK16 with pictures) Other operators: ZF2IM, ZF2UU, ZF2BE 73 es CU, Leigh/WA5ZNU
[digitalradio] Unstable WSPR on 10.140.040
Hi all, Some one is trying to transmit in wspr on 10.140.040 but the signal is not able to decode because it is too unstable . It looks like a banana . And please qsy above 10.140.100. The signal is in the visual qrss segment. 73 de LA5VNA Steinar
Re: [digitalradio] RFI-Free PCs?
On Sat, Mar 22, 2008 at 5:25 AM, Rodney [EMAIL PROTECTED] wrote: I've turned off all my cordless phones, computers and anything else I can think of that would cause this, but it still exists. I live in a residential area so there are houses all around me. I'm HOPING that the problem is in MY house and not in someone else's house, that way I can locate and fix the problem! The first step is to power your radio from a battery. If doing so cuts the noise, then the noise is traveling up the power cord to the receiver. A noise filter on the AC line will help. Once the radio is battery powered, then go and cut the main power to the house. That will tell you if the problem is in your house or not. These days, most any kind of device that plugs in can be the culprit. It doesn't have to use RF (like cordless phone, etc.)
Re: [digitalradio] RFI-Free PCs?
ORIGINAL MESSAGE: On Sat, 22 Mar 2008 08:25:34 -0700 (PDT), Rodney [EMAIL PROTECTED] wrote: Any ideas on WHAT could be generating this noise? REPLY FOLLOWS There are many possibilities. One of the strangest I personally ran across was a battery charger for an electric golf cart at a neighbors house about 300 feet away. Wiped out 40 meters intermittently as it cycled on and off. This was a tricky one because it mostly was off. Regardless, the best thing is to track it down using your CB radio. One by one, turn off the circuit breakers in your house. Hopefully, the noise will quit when you get the right one. If you get down to the last breaker (the one the CB radio is on), power it up with a battery and turn off the last breaker. Obviously, if the noise remains, it isn't your house. Next, start snooping around the neighborhood with your battery powered CB. You don't need a real antenna, just a short piece of wire in the antenna jack. When you get really close to the noise source and the noise gets really loud, shorten it up some more. With this method, you should be able to track it down in a matter of minutes, maybe an hour. If you find it is from a neighbor's house, knock on the door and tell him what you are doing. Ask him if he has been having any interference himself and offer to help find the cause. He probably has been having some and if you present yourself correctly, he will probably be quite eager to help. Good luck. 73, Bill W6WRT
