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

[Ed]

What are the opinions of the Stridbergs?

Sent from my iPhone

On Apr 25, 2012, at 15:28, "Michael O'Beirne" <michaelob666 at ntlworld.com> wrote:

> 
> 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
>> 
> 
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