Topband: Rotator creating spur on 1820

[K4SAV]

Unfortunately no.  Already tried that. That would have been too easy of 
a fix.

Jerry

On 11/2/2017 9:47 AM, donovanf at starpower.net wrote:
> Hi Jerry,
>
>
> There's a good chance the problem originates inyour control box
> rather than your rotator. Does the problem stop if you completely
> disconnect the control box?
>
>
> 73
> Frank
> W3LPL
>
> ----- Original Message -----
>
> From: "K4SAV" <RadioXX at charter.net>
> To: topband at contesting.com
> Sent: Thursday, November 2, 2017 2:40:49 PM
> Subject: Topband: Rotator creating spur on 1820
>
> I have a problem for which someone on this forum has the solution. I
> know that because I have seen that message sometime in the past.
>
> The problem is that my rotator is rectifying a couple of AM station
> signals and creating a spur on 1820. It's normally pretty weak on my
> receiving antennas but sometimes it's a problem. I found that if I
> listen on my XM-240 near that rotator it can be very loud. As soon as I
> move the rotator it causes the spur to go away, or become weak. A few
> minutes later it is back again. It pops in and out.
>
> So who had the problem and how did you fix it?
>
> Note that my XM-240 actually shows a low SWR on 160. That's because the
> XM-240 balun doesn't work well on 160 and the common mode currents on
> the feedline couple to the tower and the tower becomes the real antenna
> on 160. So in this case the tower is the antenna and it has that
> rotator cable against it picking up max signal from that cable (also
> radiating it to my other antennas). No, the XM-240 is not used on 160
> (except to find the source of this problem).
>
> The rotator is a Yaesu G-2800DXA.
>
> Jerry, K4SAV
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