[hpsdr] Fw: TX/RX Relay?

[Thompson_Peter at emc.com]

Thanks - lots of good info.

Pete

> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-
> bounces at lists.hpsdr.org] On Behalf Of Alfred Green
> Sent: Wednesday, May 14, 2008 1:19 PM
> To: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Fw: TX/RX Relay?
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> n3evl wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Since I'll be running Penelope with my SDR-1000, I assume I'll need
a
> > coaxial TX/RX relay in order to share a single antenna.  It appears
> from
> > the
> > doc that 100mA is the max current specified so I assume I need a
> relay that
> > requires no more than this (probably  less) to energise the coil.
> >
> > Does anyone have any suggestions for make/model/vendor.  I assume I
> need a
> > 12v item that I can power from the same PSU that powers the radio?
> >
> > The models I came across via a google search were either expensive
or
> high
> > voltage or had current ratings that exceeded 100mA or all of the
> above!
> >
> > Please _relay_ your ideas...
> >
> > Thanks,
> >
> > Pete, N3EVL
> 
> For low power at HF almost anything will work just fine. For a long
> time
> I used the little blue RadioShack SPDT relays for transverter IF
> switching. I've since found a cheap source of the Omron G6Y which is
> good for 10w at 1296 with >50dB isolation. Overkill at HF, but at 3
for
> a dollar I can afford it....
> For higher power I use small pcb power relays with a contact rating of
> 10A/240V. I don't recall the exact make/model, but pretty much any
> generic thing should work. For switching filter banks and antennas
they
> work great at 500w up to 10m. Cold-switched, of course.
> 
> Remember, anything below 30MHz is technically just wobbly DC anyway.
> 
> For a good selection of cheap relays, I'd recommend a visit to
> Electronic Goldmine,    http://www.goldmine-elec.com/    . No
> connection
> here, just a happy customer.
> 
> BTW, just got my Penelope end of last week. I haven't fired it up yet,
> that should happen this weekend. Fantastic piece of work, major kudos
> to
> all involved.
> 
> GL & 73, Alf  NU8I
> Scottsdale  AZ  DM43an
> 160m > 10Gigs
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