I have tried shorting the rotor wires to the base section of the HDX689 with no
changes. I also would turn the antenna with no changes in the mixing, thinking
it might have been mixing in the thrust bearing. The rotor is a M2 OR2800.
The broadcast station is on 780kc (KOH) and I hear their audio on the mix I'm
seeing. I also did a video of what I am seeing earlier this year. I thought
the mixing was from a ticRing but that was not the source of the mix as that
ring has been removed then replaced with an Alfa Ring.
https://m.youtube.com/watch?v=rZ8gXRKGkxE
Thanks....
Rich Hallman N7TR
> On Oct 20, 2015, at 9:33 AM, David Robbins <k1ttt@verizon.net> wrote:
>
> I have had to add bypass caps on some rotors also. many dc controlled rotors
> like the yaesu g series use diodes in the rotor across the stops
> microswitches to only allow rotation in the other direction when you are
> against a stop, those 'should' be shorted unless you are in a stop....
> however, the g2700 and g2800 also have a 'near the stops' slowdown feature
> that has 2 diodes that aren't shorted normally and could cause problems.
>
>
> Oct 20, 2015 12:21:53 PM, aa4nu@comcast.net wrote:
>
> Interesting challenge ... in both situations, have you tried to disconnect
> and ground the rotor control lines and/or any remote switch lines, just to
> see if that makes any difference.
>
> I seem to recall Ward, N0AX mentioning how he had to put bypass caps on his
> rotor lines at one time to resolve a noise issue in an older NCJ article?
>
> "Eliminate Noise Generated by Rotator-Control Boxes N0AX 95 Sep/Oct 35"
>
> Perhaps a review of that text might help with both situations that could
> move you toward practical solutions?
>
> 73 de Billy, AA4NU
>
> ----- Original Message -----
> From: Bill Parry
>
> I have the mixing problem and my tower is not a crank up. It is 120 feet of
> Rohn 25 with insulated guy wires. I notice it on 160, 80, and 40. I have no
> idea what is causing it.
>
> Bill W5VX
>
> -----Original Message-----
> From: Rich Hallman - N7TR
>
> Has anyone had any problems with intermittent mixing from a close broadcast
> station with a Crank-Up tower? I think I may have an issue with one of my
> towers. Cranked up I hear mixing all over 80 meters (Every 10
> KC).....Cranked down its gone. I already eliminated the antennas. Mixing
> gets very intermittent in wind as the tower moves around.
>
> Thoughts about grounding the top section to the bottom when fully extended?
> Was thinking of grounding the coax at the top and bottom of the tower?
>
> Thanks....
>
>
> Rich N7TR
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|