Do you need a 4-way Antenna Multicoupler? We have a
Finished Unit and a do-it-yourself MODULE. See the
photo at right for the module only. This is just what is
shown and does not come with connectors, case, etc.
(Instruction sheet included)     click here
The finished Assembly (SHOWN) is Temp out
Shortwave Radio
This site is a collection point for information, construction techniques, theory, and enjoyment of Shortwave Listening.
Counter
Domain
Site Map
=================
MTC-1 CONTROLLER

SYS-1  In Progress

EQA-1 EQ & Analyzer

Commercial AM/FM Tuner

HF, VHF, UHF Multicoupler

VHF/UHF Preamp

EAS-4 DX AM Receiver

EAS-3 DX AM Monitor

EAS-2 AM/FM/WX Monitor

EAS-1 AM/FM/WX Monitor

ACP-1 Audio Controller

Ultra Clean Power Supply

10 MHz UPCONVERT (SWL)

Studio Clock/Timer

Broadcast Band Monitor

Diversity Audio &
a Digital Receiver

Mackay (ITT) 3030A

McKAY Dymek   DR33C-6

Watkins-Johnson VHF

Active Multicoupler

WWVB Atomic Clock

WWVB Dual Clock

WWVB Master Clock

Crazy receivers
Time and Temp

RACAL Disaster

RACAL Twins shootout

Watkins-Johnson Meters

NEW Demodulator

Listening Post Accessories

MIL-SPEC LP Photos

My Listening Post   1   2

Dual LF/MF Receiver
NEW - AUG 2010

NEW:  RFP  Parametric
preconditioner
R&D:   
1    2    3    4
L@@k Photos 1   2   3

Active and Proximate Antenna
Tests

AM Broadcast Directory Updated
for 2010 !!!

Receiver Reviews

BEST Radios

IC-R75 UPGRADED

IC-R71A Mods

PREVIEW: KMD-1
Demodulator

NEW - Surveillance Receiver with
Audio Console

How it Began

PRESELECTION
Design Notes NEW
Preselectors
Basics
Theory
Filters
Design

Type-3  (Theory)
Type-3  (Construction)

Type-4

Type-5

Type-6   NEW

Published Article

Early R&D

Modular Design Approach

Component Parts Sources

=====================
PRECONDITIONING

Complete BCB Preconditioner

A Dynamic Noise Blanker
* * * REVISED 12-07 * * *

A Dynamic Noise Phaser
* * * REVISED 12-07 * * *

Antenna Switcher
with Imp Match & Gain

=====================
BUILD A BCB RADIO
SR-III  Hot-Rod
(or go to:)
Concept   Panel Designs NEW
Ant Rod   Freq Counter  
Panel Layout   Panel Machining  
Audio Mods  Meters   Pre-Circuit  
Schematic Collection
RCA-HISTORY (re: SR-3)

=====================
MISC SWL FUN

KENWOOD TH-F6A  mods

MFJ-965 Soup-up

AM DX Automobile Antennas

North Country Active Antenna
(my review)

All-Band SWL Antenna
(that really works)

Receive Matching Transformer

A 9:1 Balun
(for your end fed ant)

Yaesu FRG Mods UPDATED

Balun Grounding
(important)

Wire Antenna Rigging
(the easy way)

Home brew Super Insulators

AM Box Loop
(that works good)

The Old Days WPE Certificates

SONY Tabletops

Clear Channel AM BCB List

TSCM (Bond...James Bond)

IBOC Woes

Tuners Transmatchers Couplers
Contact me

EASTERN USA (ROMEO)

UTC/GMT (ZULU)

NEW UTC ATOMIC Clock Console below --  Zero-Beat your shack's clock
Your browser must allow 'Active Content'
All the material presented on this Web site, graphic and text, is the property of the copyright holder and may not be used without written permission, except under section 107 of the US Copyright Laws, or for "personal use" only. No material may be used for
resale, (c) Robert W. Betts.
Very Broadband 9:1 Receiving Balun Kit   
The Receive-only (shown) and we have
added a Heavy-Duty version as well   
click here
connector and hardware kit - Temp out
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
AM Broadcast Log HUGE !
Updated  for 2014
Read about it here.
L@@K !!!
Do you want to build a
Radio Astronomy station?
How about SETI?
Maybe Earth-Moon-Earth [EME]
Ham Radio?
Great stuff -- going cheap !!!
Click here.
Limited Stuff
Limited time !!!
Hurry, hurry, hurry...



U
P
D
A
T
E
D






N
E
W
Power control for 9 rack mounted
devices, includes circuit breaker and
line monitor.


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
bus-level send/receive.


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
30MHz coverage.







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.
My Youtube
channel
Check out my
Youtube

channel
Check out my Youtube channel
Temp Link:  K'wood TS-940 Probs.
Items below have been put on indefinite hold. See current items above.
Morse Code Instruction
Book
Read about it here.
Some Stuff for Sale
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
components;
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
$42.00.
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
US).
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.
click the picture