Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz
The signal is at times peaking at S9+20 here in central Ohio, with a bandwidth from approximately 1900 to 1930. It appears to be rapidly sweeping up the band at a rate of about four sweeps per second. You can definitely observe the doppler effect by slewing your rig up and down the band while listening for the rapidity of the pulses. Rob / KD8WK _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Soldering in the wild!
On Sat, Aug 04, 2012 at 01:22:42PM -0400, Kenneth Grimm wrote: > After suffering through our infamous "derecho" here in Virginia, I find > that I've got a* lot* of repair work to do on my beverages. Most of the > breaks are in 450 ohm window line, located in remote areas and will require > soldering. My "non-AC electric" soldering equipment seems to have been > lost in the last move and I need to outfit myself with a "wireless" > soldering device! I would be interested in what you use and if you are > satisfied with the results. Thanks. I use something called "Solder-It Butane Micro Torch", model MJ-300. I think it came from Lowes and cost around $20. Rob / KD8WK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: question about antenna bandwidth
On Tue, May 08, 2012 at 08:03:40AM -0400, k...@voyager.net wrote: > IMHO going beyond 160 feet of wire > inverted-L (5/16 wl on 160 meters) is not the best solution. Thanks, George. Actually, my intent isn't to perfect a DX antenna, but rather, to get the piece of wire with the current maxima up in the air. As it is, with the current node on the ground, I suspect it is somewhat shielded by my aluminum-siding sided house. My "L" is really not really a strict "L" per the handbook standards. It goes up from the feed point to where it is supported by a rope attached to the 2nd story gutter, then at an angle up into a convenient tree and across the back of the lot. Even as is, it works amazingly well considering the compromises. Rob / KD8WK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: question about antenna bandwidth
Thanks, gentlemen (Eddy, K8GG, ZR, Roy, Herb, et. al.), for all the feedback on this. So, it seems it's pretty much what I expected -- if you tune an antenna for better results on one frequency, you detract from its operation on another. Maybe one of these days I'll get around to playing around with that 3/8 wavelength L anyway... Rob / KD8WK On Mon, May 07, 2012 at 03:22:19PM -0400, Herb Schoenbohm wrote: > Another rule for this is "the lower the Q of the matching network the > greater the bandwidth." > > Herb Schoenbohm, KV4FZ > > On 5/7/2012 1:48 PM, Roy wrote: > > If I were to extend my 1/4-wave inverted-L to a 3/8-wave L, and tune > > out the inductance with a fixed capacitor at the base, what would this > > do to the broadbandedness of the antenna? > > > > There is an old basic principle to remember about this, "The fewer the > > components in general, the broader the bandwidth." > > > > 73, Roy K6XK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: Question about antenna bandwidth
If I were to extend my 1/4-wave inverted-L to a 3/8-wave L, and tune out the inductance with a fixed capacitor at the base, what would this do to the broadbandedness of the antenna? Inquiring minds... Rob / KD8WK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: I.C.E. status?
On Mon, Aug 01, 2011 at 01:42:17PM -0600, BRYON PAUL n0ah VEAL wrote: > I have not had a couple of emails returned yet from the company regarding a > repair I need to send in- does anyone know the status of the company and how > they are doing? They have some information on their website: http://www.iceradioproducts.com/ Rob / KD8WK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Need help identifying RFI source
On Mon, Jan 24, 2011 at 08:20:35AM -0600, K4RO Kirk Pickering wrote: > I have been plagued recently by a noise source which is > wiping out signals on the 160m and 80m bands. It is 20dB > louder on my SW Beverage than any other direction. > > The noise is intermittent, and comes on for roughly 10-15 > minute intervals, and when it goes off, it is completely > quiet for another roughly 10 minutes. The amplitude peaks > are at approximately 20-30 kHz intervals, an seem to vary > somewhat with frequency. I can hear the noise from about > 1600 to 4200 khz. It's really hurting my 80 and 160 meter > reception. Here is what the noise sounded like this morning: > > http://www.k4ro.net/k4ro/audio/QRN_Jan24_2011.wav > > Before I start hunting, I wonder if anyone has heard this > type of noise before, and might be able to identify it? > Thanks for any suggestions. >From your description, I strongly suspect it is a high efficiency furnace -- most likely caused by either the inducer motor or a DC blower motor. I've heard of numerous complaints about this recently, some even on this list, and have a friend who is being plagued by his own new furnace, which is essentially wiping out his HF capabilities. Do you have a neighbor who perchance has installed a new furnace recently, perhaps just before the new year in order to take advantage of the expiring tax credit? Rob / KD8WK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
