|[AMRadio] Cable splitters for receivers|
ars.w5omr at gmail.com
Sat Jan 11 15:03:48 EST 2014
On 01/12/2014 01:04 PM, Donald Chester wrote:
> I once used two receivers, a 75A-4 and a R-390, just by connecting the
> same transmission line to both receivers using a T-connector. It
> didn't seem to attenuate either receiver's signal level noticeably.
> The greatest danger in doing that is that spurious products from one
> receiver will show up in the other.
I did that same thing with a pair of Hallicrafter SX-73's (R-274-D) and
what I noticed was, that trying to peak the 'Antenna' tuning on one
receiver, detuned the other.
I'm going to ass/u/me that the input impedance on the Hallcrafter SX-73
is ~50ohms, simply for the mere fact that they are fed via SO-239's.
So, approx 25ohms at each receiver is pretty low - about half of what
they're looking for.
That's a fairly low impedance, but to have the tuning of one affect the
other was unexpected. Perhaps a 2:1 transformer, and parallel each on
the secondary may have eliminated that phenomenon.
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