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

[Clemens Ostergaard]

I am very content with the MCA 104M that I use with assorted Collins,
Racal, National radios. The Stridsbergs are expensive but good. At another
position, I do use an old Rohde & Schwartz NV4 multicoupler for 12
receivers, it is chock full of 6BA6'es, and has a certain amount of
amplification, but is of less use below 1,5 Mhz. great footwarmer in winter.

Best,

Clemens S.Ostergaard.

On Thu, Apr 26, 2012 at 5:36 PM, Ed <aidehua at aol.com> wrote:

> 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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