[Kenwood] TS-440S issue

Mon Nov 10 08:40:11 EST 2014

Check the RX BPF diodes on the RF Unit for leakage. Common problem. Usually
D6.
On Sun, Nov 9, 2014 at 7:14 PM, Howard Holden <holden7471 at msn.com> wrote:
> Got a TS-440S which has suddenly acted up on transmit – not the dot
> problem. This is a later issue radio.
>> Seems like I’m getting RF feedback into the rig, regardless of which
> antenna I use, even a dummy load. Problem is particularly acute on 40M but
> present on 80 thru 17M as far as I’ve checked. Depending on the antenna, I
> can get only 20 to about 50W out before there’s a buzz on the signal, and
> increasing power beyond that makes the display blink on and off rapidly and
> irregularly.
>> I find nothing loose internally, I removed and reseated the connectors on
> the pot control boards thinking there might be a drive pot issue. I’ve
> relocated all antenna lead-ins and checked the tightness of all
> connections. Put the keying lead a number of turns on a toroid (T-240-43,
> which works great for TVI), got choke baluns on antenna lead-ins.
>> Any good ideas out there, anyone with a similar problem?
>> Thanks
>> Howie WB2AWQ/7
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Clif Holland KA5IPF
www.avvid.com