Topband: Rotator creating spur on 1820- results

[K4SAV]

Thanks George

"AM 890 x 2 = 1780 KHz + 1730 KHz = 3510 <- - your 80 meter birdie."

Yep, that works, except I had a typo when saying one of the contributor 
to the 160 problem was 1730.  No station on 1730. Copied the wrong 
number off my notes.  Sorry.  I should have said 1310.

My 80 meter problem is also due to that 1310 station, (1310 + 890) + 
1310 = 3510.  Both very strong local stations.

The really tough question is where is that mixer. Can't do much about 
the stations.  Only hope is to find the mixer.  There are lots of 
possibilities.  Might be close, or maybe not.  That 1820 problem was 
generated on my tower and radiated to my receiving antennas located 550 
ft from the tower.  Very glad to get rid of that one.

Guess I will have to see if I can track the 80 meter problem by using a 
portable 3510 receiver.  I can locate the general direction using my 
receiving antennas and it's not in the direction of either of those two 
stations.  Funny thing is the 3510 birdie is minimum when the antenna is 
pointed at the 890 tower and I know that is one of the contributors.  
When pointed at that station. my receiving antenna has a null at 96 
degrees to that station and that is the direction to the mixer.  That 
direction passes very close to my tower so I was expecting to maybe see 
some change in the 80 meter problem when I put that strap on the 
rotator, but it didn't happen.

Jerry, K4SAV


On 11/5/2017 5:45 PM, k8gg at voyager.net wrote:
> Hi Jerry & Topbanders,
>
> Doing the math from the info below:
>
> AM 890 x 2 = 1780 KHz + 1730 KHz = 3510 <- - your 80 meter birdie.
>
> I hope this makes sense and helps solve the puzzle.
>
> As I noted before, it is probably generated off site by some rusty
> connection in a radio tower that is a nasty diode as well.
>
> 73,  George,  K8GG...
>
>