[Premium-Rx] FS: HF RECEIVER MULTICOUPLER(FROM DRAKE7-LINESTATION)

[Williams, Barry N]

I built an antenna patch panel for multiple transmitter/receiver units.  Al Klase wrote an article about an SWL antenna distribution system, and some parts of my system are based on his article.  I have several 1:2 splitters that are wound to his specs, multiple windings and binocular toroid forms.  I distribute the signals using 52 ohm coax to each receiver.  I think the splitter was called a 3db splitter in his diagram.  I used three of these to produce a 6db 1:4 splitter.  I also have an 8 port distribution amplifier for the receivers.  For old receivers I built 4:1 baluns.  At the receiver the 52 ohm coax uses a BNC connection to a small metal box.  Inside is the balun, the other end has two universal binding posts.  The main costs were the boxes and connectors.

73,
Barry
KD5VC
------Original Message------
From: K0DAN
To: n4xy at comcast.net
To: Premium Receivers
Subject: Re: [Premium-Rx] FS: HF RECEIVER	MULTICOUPLER(FROM	DRAKE7-LINESTATION)
Sent: Apr 24, 2012 8:10 PM

Hi Ed, et. al.....

Wow this innocent post on my part really got over-analyzed!

FWIW the Drake splitter was a small PC board with a pair of toroid's and a 
few components, which worked great allowing the TR7 and R7 "twins" to 
multi-receive, provided the input band device (I think this was before we 
talked about "roofing filters") was at or below the second receiver's 
operating frequency. For me, this was in the early 80's and I really enjoyed 
that station for both amateur TX/RX and simul-receive utility monitoring. 
The Drake multicoupler was a simple passive device, but worked very well in 
the HF spectrum, especially where the noise floor allowed the user to give 
up a  few dB in sensitivity.

The Drake circuit was nothing complex, it was just a bit unusual for its 
timer, at least in amateur use. It has been sitting idle here for some time, 
and I am in "reduce inventory mode", so that's why it's up for sale (and 
also spoken for).

There was a time when I had an 8-port active multicoupler, and when you 
split a signal that many times you need some gain to compensate for the 
circuit losses, but to just have one AUX receiver, 3DB is often an 
acceptable loss.

A previous poster mentioned the simple resistor splitter, which is 
definitely an option, but the slightly-more complex balun passive splitter 
(not necessarily Drake) provides a flat/broadband approach to the entire HF 
spectrum. Not bad for a handful of components without the need for AC/DC 
power!

Sadly, this is simple tradecraft which is being lost...we should try to 
perpetuate it. Your splitter circuit board might be useful to some 
young-'un.

Have fun!

73
dan
k0dan

-----Original Message----- 
From: Ed Tanton
Sent: April 24, 2012 04:57 PM
To: Premium Receivers
Subject: Re: [Premium-Rx] FS: HF RECEIVER MULTICOUPLER(FROM 
DRAKE7-LINESTATION)

Years ago I noticed that balun in their catalog, or online, and talked to
Drake about it. Bought one, and have it around somewhere. Really nice little
guy. I figured sometime I might want to simply split off some 50 ohm
receiving something, and that made as simple a solution as I have ever
thought of. Always nice to have a passive, flat, 50ohm second receiving
output.

Ed Tanton

website: http://www.n4xy.com

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