On a related but tangent issue...
I just found the following link today:
*http://huprf.com/huprf/k3-if-buffer-pa-k3/*
/_*K3 IF Buffer – PA K3*_//_*
*_/
/The K3 and successors are recognized as the rig of choice by the vast
majority of serious contest operators and DX’ers worldwide. When
combined with the P3 Panoramic Adapter, SDR capabilities can be realized
on the small P3 screen or on a larger display using the SVGA option.
However, if you want to use the IF output to drive any other SDR
equipment, there are some issues that need addressing –//
/
* / the output level of the IF port is about 15 to 20dB lower than
it should be, and/
* / there are strong Local Oscillator signals from the K3 presented
at the IF Out port – this is still the case if you run from the P3
IF Out port.//
/
/The PA K3 is a small external buffer unit that can be attached to the
IF out port of any of the series (K3, K3S and P3). It provides a
filter centred on 8.215MHz and an amplifier with approx 20dB of gain,
bringing signal back up to the correct levels. The filter uses wound
toroidal inductors, rather than lower Q SMD inductors./
+++++++++++++++++++++++++++++++++++++++++
From the Technical manual for this buffer assembly:
/In normal operation of the K3/K3S, the nearest LO signals to the IF are
when operating on Top Band (160m) -see Fig 2 below which was taken from
a recent K3S.
/*http://huprf.com/huprf/wp-content/uploads/2016/03/PA-K3-Manual-V1_1-1.pdf*/
/I am not smart enough in this part of things to know if this is a
"real" concern, or "marketing" to sell a buffer/amp kit. YMMV./
/
73,
______________________
Clay Autery, KY5G
(318) 518-1389
On 01/05/20 21:59, Bob McGraw K4TAX wrote:
If either the IF Output or the split approach with RX ANT IN and OUT
is used, the ports are protected during transmit. However, some of
the SDR receivers are in plastic / unshielded boxes and themselves may
not be adequately immune to RF. If one is concerned, it might be
wise to attempt to line the inside of the case with foil tape or
enclose the receiver in a suitable metal box {the way it should have
been in the first place}.
73
Bob, K4TAX
On 1/5/2020 8:40 PM, AL7CR wrote:
I used an SDR-IQ connected directly to the IF out for many years with
no problems whatever.
On Sun, Jan 5, 2020, at 2:29 PM, weaverwf wrote:
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