[ICOM] IC-756pro RX ANT switching

[Adam Farson]

Hi Julio,

I am convinced that there is nothing wrong with your IC-7800. It seems to me
that the active antenna is either faulty or a lousy design. You may wish to
return it for exchange (or refund!)

The "muting" button does not change anything in the RF signal paths. You
will need an external switch such as the KD9SV Front-End Saver to protect
the receive antenna input when using dedicated receive antennas.

My favourite QSK station was ZSC2 on 500 kHz. (Yes, I actually got to
operate it once!) The control point and receiver site were on the coast
about 40km south of Cape Town, and the transmitter site - with a 15kW
Marconi MCW (A2A) transmitter feeding a great big wire array via 600-ohm
line - was 50km inland from the control point. There was no hot-switching
problem at all, and no risk of receiver damage either. The inter-site link
was a leased Post office wireline facility. 

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Julio Peralta
Sent: 15 January 2006 10:12
To: 'ICOM Reflector'
Subject: RE: [ICOM] IC-756pro RX ANT switching

No Adam I haven't tried another antenna jack. I'll try that this evening.
The antenna does seem to work, however an S9+10 signal on the windom gets
reduced to S1 or less but with much less noise. If I remove power from the
active antenna the signals go away. I think I need to live with it a little
more.

Another question Adam do you know if the mute switch on the external keypad
described on page 2-6 of the 7800 manual makes the front end of the 7800
safe from high levels of RF from nearby antennas? I think you said the other
day you don't own a 7800 as yet but I know you've studied the radio and may
know the answer.

Julio, W4HY



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