Hello Bill,
I'm switching a two stack of 4L SteppIRs - 132 and 100 ft. Use a
homemade stackmatch plus that has BOP.
First SteppIR accessory to get is Larry's, N8LP, SteppIR Tuning Relay
boxes for each of the SteppIR ant. Along the same line of saving
equipment from hot switch damage, you may want to look at the
arrangement I use for switching a Stackmatch (will work with three
ant.). Here are the references for the stackmatch plus and the
controller: http://pvrc.org/Newsletters/dec04.pdf and
http://pvrc.org/Newsletters/jun04.pdf The stackmatch plus BOP works
for a two stack. The controller will work for a stackmatch or, by
rearranging the matrix diodes, allow the same non-hot switching
feature to be used for controlling other applications.
Good luck with the new QTH and ant. farm.
At 07:04 AM 7/31/2006, you wrote:
>
>In a message dated 7/31/2006 4:19:30 A.M. Greenwich Standard Time,
>w7ce@curtiss.net writes:
>
>In my models, I've also noticed that the F/R suffers when the antennas are
>stacked. However, I've been able to re-optimize the element lengths based
>on the stacking distance and height above ground and can get F/R numbers
>that meet or exceed those of a single antenna. In some cases, the change
>in
>
>
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>This is not only the case with SteppIRs, I had the same thing with my KLM
>monobanders. However, living in FL, giving up some F/B to get the
>benefits of
>stacking was worth it.
>
>Most of the stacks I had used around .75 for spacing....pretty much what the
>master W2PV recommended.
>
>Plans for KH6 include three SteppIRs...the MonstIR at 90, a 4 el at 60, and
>another at 30, all phasable with a Stackmatch on Rohn 65.
>
>Over the last 20 years I used Ameritron boxes for switching the
>stacks...BIP/BOP/TOP/BOT, and will miss the second one, BOP, since I
>will be using the
>Stackmatch which has no provision for BOP. Yes, I know I can use the lower
>single antennas to achieve that, but I have always been a fan of using all
>antennas to get the maximum gain for the higher angle radiation.
>
>Spacing on the antennas for 90/60/30 should be a bit close on 20, but with
>the middle one switched out it should be close to the killer stack W2PV spoke
>of for 20. The three high should scream on 15 and 10, since I have
>used stacks
>at this height before for those bands.
>
>I'd like to hear from the guys who have used the Stackmatch to phase their
>SteppIRs.
>
>Bill K4XS
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>
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73,
Mike, K4GMH
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