Re: [loopantennas] CRT Degaussing coil, anybody tried one for a loop
- No problem Phil.
I had the same idea years ago when repairing TVs was my bread and butter.
The one I experimented with was out of a 25" Zenith System II (?) console. The self resonance of the degaussing coil was about 80KHz so one might be useful for a WWVB receiver.
Sioux Falls, SD
On 4/7/2012 16:47, Phil wrote:
Thank you Tim,
I was afraid that was the case, but thought I'd ask anyway as the price
was right. Later this summer, before the winter listening season sets
in I plan on building a Varactor remote tuned loop for the 200-530KHz
range, something small enough to fit on a rotator above the roofline,
but large enough to hear something :)
73 de Phil, KO6BB
http://ko6bb1.multiply.com/ (OTR Blog)
http://www.qsl.net/ko6bb/ (Web Page)
Grundigs: Satellit 750 (2011), S-350 (2006)& G6 (2011).
Icom: R-75 with Two 250Hz CW Filters.
Kenwood: TS130S HF Transceiver (circa 1980).
Radio Shack: DX-380 digital portable (circa 1990).
RFspace: SDR-IQ (circa 2012)
Zenith: Royal-7000 Transoceanic (circa 1969).
ACCESSORIES: Homebrewed LF Pre-Amp, MFJ-949E HF Tuner
Homebrewed 6 Hz Filter.
ANTENNAS: 88' Long Ladder-line fed dipole, Apex at 35 feet.
Ratzlaff Active Whip up 24 feet for LF/MW
Merced, Central California, 37.3N 120.48W CM97sh
On 4/7/2012 8:40 PM, Tim Hills wrote:
> Too many turns close together, distributed capacitance on those is
> VERY high. Most post-tube degaussing coils are an Aluminum alloy wire
> that has high resistance so even if you could tune it the Q would be
> very low anyway.
> Might be useful on VLF or ELF since it was designed for 50-60Hz.
> Unwound the wire is too soft to use as antenna wire.
> Hooked up to a 12VAC/1A or better transformer you could probably use
> it as a degaussing coil...
> Tim Hills
> Sioux Falls, SD
> On 4/7/2012 12:37, Phil wrote:
>> Hi All,
>> I just found an old TV in the dumpster that had it's back off, so I
>> snagged the circuit board (good for parts) and the degaussing coil. At
>> first I passed the coil by, but then on second thought went back and
>> snagged it.
>> It's resistance reads 20 Ohms, so it must have a fair number of turns in
>> it. When spread out in rough circle it's a bit over 3 feet in diameter.
>> Question: Has anybody tried using one as an "untuned loop" for LF
>> (perhaps in the 200-530KCs range)? If so, how well did it work?