Reed switches can fail. I wish I did not learn this first hand.
I found that the RT21 may not detect the switch open/close state changes at
very slo0w speeds, like at the end of a ramp down. I had to change the
minimum speed higher once I got a working rotor back in the air.
Al N6TA
On Mon, Nov 11, 2024 at 10:34 AM <towertalk-request@contesting.com> wrote:
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> Today's Topics:
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> 1. TH6 discussion (ARTHUR BERNSTEIN)
> 2. Re: Remote compass? (john@kk9a.com)
>
>
>
> ---------- Forwarded message ----------
> From: ARTHUR BERNSTEIN <n2ka@verizon.net>
> To: towertalk@contesting.com
> Cc:
> Bcc:
> Date: Sun, 10 Nov 2024 23:04:12 -0500
> Subject: [TowerTalk] TH6 discussion
> The fact that the TH6 has a 24 ft boom is great. The fact that it uses
> traps, in my opinion is not so great. My last two multi and beams have been
> trapless. Unlimited power with the balun being the
> Limiting factor. If I had a 24 ft boom and 6 elements, I’d junk the traps
> and add 6 more thin full sized elements to have better performing beam .
> Another option would be to copy the JK Tri M. Multi element tribander with
> 3 simultaneously driven elements. No traps. The antenna I use is an
> expanded version of F12 C3 called an XR5. It’s 5 bands , 10 thin full sized
> elements, no traps on the 18 ft boom. Only 2 elements per band but works
> well. JK has a newer improved version.
> This just a few thoughts.
> Art., N2KA..
> Sent from my iPhone
>
>
>
>
>
> ---------- Forwarded message ----------
> From: <john@kk9a.com>
> To: "'Jim Miller'" <jim@jtmiller.com>, <towertalk@contesting.com>
> Cc:
> Bcc:
> Date: Sun, 10 Nov 2024 23:26:59 -0500
> Subject: Re: [TowerTalk] Remote compass?
> Jim
>
> I am not very familiar with SteppIR or AlfaSpid products. I looked up the
> AlfaSpid RAK-1 rotator, I see a lot of side bolts on the mast mount, I am
> not sure how that grips the mast. You could draw a line with a paint
> marker on the mast, rotator and antenna bracket to see which item is
> slipping. Perhaps nothing is slipping - I see that RAK-1 uses a reed
> switch. I have a number of rotators that use these pulse sensors with
> Green Heron controllers and they are very sensitive to leakage. I have had
> direction control issues that were caused by failed lightning protectors.
> Another thing that is possible with pulse sensors is, if your controller is
> off and you have a strong enough wind to turn the motor, the controller
> will not know that the beam turned and when the controller is turned back
> on it will read the old beam heading.
>
> GL,
> John KK9A
>
> From: Jim Miller <jim@jtmiller.com>
> Sent: Sunday, November 10, 2024 12:37 PM
> To: john@kk9a.com
> Cc: towertalk@contesting.com
> Subject: Re: [TowerTalk] Remote compass?
>
> I have on occasion found my antenna pointing as much as 40 degrees off the
> proper bearing. I recently had the antennas lowered to refurb my Steppir
> and made sure that all was very secure. Mast is really tight to the rotor
> which is effectively pinned to the tower. Antennas are tight to the mast.
> Something must go wrong but I don't know what it is and figuring it out
> when it is dark is very difficult. There is some backlash in my Alfaspid
> which if the wind was really blowing could cause tripping of the magnetic
> sensor but I've not been able to correlate it with a windy day.
>
> Hence the desire for a compass like the 403A.
>
> I'm considering it.
>
> jim ab3cv
>
> On Sat, Nov 9, 2024 at 10:01 PM <mailto:john@kk9a.com> wrote:
> So you don't trust your rotator's potentiometer or counter indicator? 4O3A
> sells a controller that uses a boom mounted compass for directional
> indication and I am told this works well.
>
> John KK9A
>
>
> Jim Miller AB3CV wrote:
>
> Anyone know of a remote compass I could buy and place on my mast to know
> where my beam is pointed when I can't see it?
>
> Would need to withstand RF fields from 160 thru 6m from my 1500w amp.
>
> Thanks
>
> Jim ab3cv
>
>
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