This site is a collection point for information, construction techniques, theory, and enjoyment of Shortwave Listening.
|NEW UTC ATOMIC Clock Console below -- Zero-Beat your shack's clock
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resale, (c) Robert W. Betts.
For Sale Limited quantity stuff - all very limited
|The SWL Balun is back!
9:1 Receive Antenna Transformer
Buy SWL Stuff, Below, Bottom of Page
A good receiver, decent antenna(s), and an effective preselector. What more could an SWLer ask for? Well, there's always something MORE that we could use ... right?
I hope you enjoy this site. In time it's going to get fairly large - maybe there will be something that you can take from here to enhance the enjoyment of this hobby. - Bob, N1KPR
Do you want to build a
Radio Astronomy station?
How about SETI?
Maybe Earth-Moon-Earth [EME]
Great stuff -- going cheap !!!
Limited time !!!
Hurry, hurry, hurry...
Power control for 9 rack mounted
devices, includes circuit breaker and
AC Power Line Filter with Volt and
Amp meters, filters EMP, RFI, surge,
hash, transients and other impulses.
Demodulator with four inputs from
receiver IF stages. Five forms of
detection including Syncronous AM,
Peak and Notch filtering.
Audio Control Console with preamp,
power amp, bandwidth contouring,
and Demod selectors, pre, post and
RF Preconditioner/Preselector with
filters from 20KHz through 35+MHz,
Input/Output selection, Preamp,
100KHz Marker, 10MHz Upconverter.
W-J 8718A with ISB and 5KHz to
W-J DMS 105A-2 Demodulator for AM,
SSB, CW, multiple filter selections,
and passband tuning capability.
W-J 8718 MFP (microprocessor front
panel) with same capabilities as the
manual unit above.
Old Friends: If you are a fan of my old site that used to
be on Geocities, then you may be able to view it in the
Geocities Archives, here.
|Items below have been put on indefinite hold. See current items above.
9:1 Receive-only Antenna Transformer
Only 10 made -- act now.
Completely weatherproof: water, acid,
caustic, ozone, salt and UV resistant. The
transformer is wound on a special ferrite
toroid with 22 Ga magnet wire and potted
into the zinc housing with Marine Epoxy.
The unit is built to MIL-SPEC for portable
and field applications, and is now available
here for your permanent home installation.
These are so "over designed" that they can
tolerate several watts of transmitter power
(but, not warranted against that).
Rated for 20KHz through 30MHz+
These transformers are built with
the absolutely best quality
Teflon/nickel SO239 connector,
gold plated screw terminals,
diecast zinc (not aluminum)
housing, marine epoxy potting
compound, stainless steel
hardware, and a very expensive
ferrite toroid core.
Our cost for the parts is almost
Our labor is about 2 1/2 hours each.
For a very limited time you can
have one of the ten that I've built
for $48.00 (+shipping, $5.00 in the
If there is enough interest in this item, I will go into larger production quantities, but the cost will include my labor. At that time the cost will be in the $60.00 area.
Note to previous customers: If you purchased the raw Balun module from me in the past several years, rest assured that it was made with the exact same toroid
core and wires. It was no longer feasible for me to continue the "module-only" item, so I decided to incorporate the actual epoxy potting in a usable weatherproof
enclosure, rather than the bare potted module. Those sold for $28.00, so the added cost now covers the enclosure and connectors...that's the only difference.