[1000mp] Sticking ant relays

[Peter Alterman]

Csaba,
I had the same symptoms with my Mark V and Alpha 9500.  I now have it occasionally with my K3S and the Alpha.  It is an RFI relay issue on the PA antenna relay circuit.  Do you have more than one antenna connected to the amp? If so, see if better isolation fixes the problem. If not, look to broader RFI abatement strategies.
73, Peter W2CDO






Sent from my Verizon 4G LTE smartphone


-------- Original message --------
From: HA3LN <list at ha3ln.hu>
Date: 4/16/18 4:17 PM (GMT-05:00)
To: All about Yaesu 1000mp <1000mp at mailman.qth.net>
Subject: [1000mp] Sticking ant relays

Deal All,

I'm wondering whether if any of you faced this before.

I have a FT1000MP MkV Field with an AL-811 with 500W out.

On the cases when the radio switches back from TX to RX it sounds like the
MP's ant unit relay sticks and I can hear barely/nothing at all the
band. The receiver comes back only after a certain amount of time or if
I step the foot-switch again couple of times.
If I run barefoot 100W nothing similar happens. I don't have opto
decoupled TX GND/relay switching, only directly connected with RCA's.

I suspect the RF comes back somehow or maybe the PA ant relay might be
guilty.
Do you think is this the relay or the switching transistor on the ant
unit board?
Any other ideas?


Thanks a lot in advance.

73!
Csaba  HA3LN
http://ha3ln.hu/
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