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

[Michael O'Beirne]

Gents

A propos Dan's interesting piece tonight, I can certainly commend the 
switching efficiency of the Drake R7 and its associated signal splitter.

As for resistive splitters they do have the advantage of being dead flat 
from DC to GHz.  As an extreme example, my old HP catalogue records that the 
HP11636B power divider fitted with APC connectors (using a three-resistor 
two-way star splitter) operates from DC to 26.5GHz with the usual 6dB 
nominal insertion loss.

For ordinary HF multicoupler use, the Raven Research R1100-16 takes some 
beating.  This is 1 in and 16 out at about the same level as the input.  The 
only drawback is that it runs warm and needs fresh air above and below.

73s
Michael
G8MOB

----- Original Message ----- 
From: "K0DAN" <k0dan at comcast.net>
To: <n4xy at comcast.net>; "Premium Receivers" <premium-rx at mailman.qth.net>
Sent: Wednesday, April 25, 2012 2:10 AM
Subject: Re: [Premium-Rx] FS: HF RECEIVERMULTICOUPLER(FROM 
DRAKE7-LINESTATION)


> 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
>