Re: Topband: Help with RFI
Jim's suggestion worked beautifully here! 14 turns of CAT5 cable on a single 2.4 #31 core works much better than the old choke with 5 or 6 turns through four stacked 2.4 #31 cores. It eliminated the last traces of RFI coming through my computer speakers running 700w on 75 meters. And three more turns of the line cord through the same core all but eliminated it on 40 meters. (If you haven't figured it out already, the dipole is much too close to the house.) 73, Mike www.w0btu.com On Sun, Jan 13, 2013 at 10:34 AM, Jim Brown j...@audiosystemsgroup.comwrote: On 1/12/2013 7:38 PM, Mike Waters wrote: I wrap a few turns of the CAT 5 Ethernet cable coming into the back of my shack PC around a few stacked 2.4 diameter #31 ferrite cores. For 160M, 14 turns on a single #31 core is a pretty good choke. Don't overlook power supply cables as a possible receiving or radiating antenna for RF. A #43 core works at these frequencies, but not nearly as well. 73, Jim K9YC _ Topband Reflector _ Topband Reflector
Re: Topband: Polyphaser IS-50UX-CO vs ICE Model 303?
Hello Tom, I have Polyphaser and I.C.E. units on all my cables ( Antenna and all Control ). I installed them in 1991 after several strikes damaged my Tranceivers. Since then, I have had no problems. The most important is a good Grounding System. A couple of ground rods won't do the trick. 73..Price W0RI near Saint Louis, MO. Subject: Topband: Polyphaser IS-50UX-CO vs ICE Model 303? Hello, Am in the process of running underground coax/control cables to DXE UE-1P Grounding and Utility box IOT run 40m V dipole and topband inverted L/FCP. I have had the Polyphaser 50UX in the HF system since 2008 and it has worked wellI have two each of PP and ICE in the radio closet and wonder which the group would recommend over the other. The reason the HF system has the PP is that they arrived before the ICE units. What has been your experience/advice? 73 Tom CX7TT aka CW7T _ Topband Reflector _ Topband Reflector
Re: Topband: Need help to improve DX on 1/2 acre lot from CA(k...@juno.com)
This is only partially true. If a DXpedition is carefully planned, like, say, VP6DX and I'm sure upcoming Clipperton will be, it will be heard by thousands and one needs everything he/she has +1 dB to break through the pile-up of hundreds Europeans calling. 4SQ-ers/10K go first, then the real battle starts and that's the time when every TX dB counts. Anyway, we all are prisoners of the skip, which was awful lately. 73 Vic US5WE/K1WE KN29AU Пятница, 18 января 2013, 21:36 +01:00 от Lennart M lennart.michaels...@telia.com: Ämne: Re: Topband: Need help to improve DX on 1/2 acre lot from CA(k...@juno.com) I agree with most, but be careful not to be louder on TX than you can RX! Easy to achieve from a small lot with loads of qrn and qrm, ask me. Allso there is a point where your ouput power flat top, and dont show any reward. I think Top W8JI found the same years ago. Still, you you can have lots of fun. 73 Raoul ZS1REC, DXCC from 40m x 20m, lots of dedication,wasted qrn nights and red eyes. Greetings Raoul and all. I agree with you Raoul! Going back many years in my Telecom work we used the term balanced link budget meaning just what you are saying. It is a waste of power, frequency use and time to use more power than needed (and that goes for each direction). No point in running several kW if you cannot copy the station you are calling. 73 and I do hope 160 is catching up, this morning in Eu was a disaster. Len SM7BIC _ Topband Reflector _ Topband Reflector
Re: Topband: Problem with Sensor Lamps
On 2013-01-18, at 4:24 PM, Martin wrote: A fellow ham has a problem with noise on 160m. The band is unusable due to noise peaking 9+20 24/7. I think the source is a sensor lamp in his neighbours house. The neighbour complained about the lamp switching on and off when Lutz transmits . I know this has been discussed here, please push me in the right direction. Hi Martin, Awhile back my son installed a set of those hand-capacity sensor lights for us here beneath the kitchen cupboards---they are quite nice-looking when activated, are the type that if you touch the sensor button three times in succession, the lamps' intensity will increase accordingly... I found the very same thing here: on any band, my RF would trigger the lights to activate, and when they were on, the RFI in my receiver was terrible. The only cure that I am aware of---and it works for me---is to COMPLETELY UNPLUG the lights from the AC mains before an operating session in the shack. When I first brought this subject up some months ago, I do not recall reading of ANY fixes beyond that, unfortunately... ...Hardly the sort of news that you'd want to hear when it's a neighbour being affected, surely, but that seems to be the nature of the beast, sadly... ~73~ de Eddy VE3CUI - VE3XZ _ Topband Reflector
Re: Topband: Problem with Sensor Lamps
I know this has been discussed here, please push me in the right direction. It has been suggested that the only fix is to get rid of the lamp. That may be true, or it might be that a serious ferrite choke on the line cord might fix it. Either way, you've got to get the neighbor to WANT to fix it. Especially if the neighbor is uncooperative, one approach is to transmit as often as possible on frequencies that trigger it with legal limit power, choosing your operating frequency so that you're not bothering other hams. 73, Jim K9YC _ Topband Reflector
Re: Topband: Topband Digest, Vol 121, Issue 19
About 20 years ago when I started my first trek on 160M my daughter had one of these lamps. It destroyed TB and yes it even turned on and off when I transmitted. I never told her what I suspected and one day she asked me to look at it.. I decided it must be defective and bought her a brand new high intensity lamp to read by and she was very happy.. Needless to say I took the lamp out back when she was not around and took a baseball bat to it.. Never had the problem again.. Now I suspect your neighbor might be adversed to your taking a baseball bat to it so some tact is necessary.. Suggest the lamp is a problem and cant be fixed and maybe they will purchase a new one that is NOT RF actuated. http://www.qsl.net/wa3mej/index.htm - Original Message - Message: 4 Date: Fri, 18 Jan 2013 22:24:02 +0100 From: Martin dm...@t-online.de To: topband@contesting.com Subject: Topband: Problem with Sensor Lamps Message-ID: 50f9bd72.3060...@t-online.de Content-Type: text/plain; charset=ISO-8859-1; format=flowed Topbanders, A fellow ham has a problem with noise on 160m. The band is unusable due to noise peaking 9+20 24/7. I think the source is a sensor lamp in his neighbours house. The neighbour complained about the lamp switching on and off when Lutz transmits . I know this has been discussed here, please push me in the right direction. Thanks. Martin, DM4iM -- Subject: Digest Footer ___ _ Topband Reflector
