[1000mp] Antenna relays

[Garry Shapiro]

FWIW, and to dispel the notion that Solution #2 might be the culprit in 
nearly all cases:

In my case, the problem first appeared while on DXpedition, with a radio 
that had been used for about a half year at home and was still in 
warranty. It occurred with two different antennas on different bands. It 
continued to occur after reinstallation in the home shack after the 
DXpedition, until it was sent to Yaesu, and was returned home after the 
repair. That rules out the antenna.

Garry, NI6T

Tod -ID wrote:
> A follow up to my inquiry on the reflector a few days back.
>
> Several folks responded directly and via the reflector. There were two
> alternatives suggested by persons who said they had experienced a similar
> problem.
>
> 1. The problem is in the FT1000MP and associated with the RX relay system.
>
> 2. The problem is external to the FT1000MP and is some fault in the antenna
> system.
>
>
> I decided to check idea #2 first. I found that my RX antennas for 80 meters
> [K9AY, Phased active verticals] were receiving just fine even when the main
> transmitting antenna was not receiving as expected. Since the RX antennas
> enter via the special jack for such antennas rather than the A or B coax
> jacks, I decided to check the TX antenna itself for changes.
>
> After five consecutive days of snow, 12 inches in the last day, I decided to
> check the TX antenna from the warmth of the shop using my spectrum analyzer.
> Sweeping the 80 meter band I could see periodic changes of at least 15 dB
> across the band. The changes were abrupt. Maybe related to wind action
> outside -- I don't know. 
>
> However, the test was conclusive -- my situation was a type #2 one and the
> fix is antenna system repair.
>
> I am putting this on the reflector so as to add to the knowledge base for
> this type of failure. My suggestion is to verify that the antenna is not the
> cause as a first step -- much easier than trying to check out the relays.
>
>
>
> Tod, K0TO
>
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