Today's Message Index:
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1. 05:59 AM - Re: simple antenna for 704 mHz (nuckollsr)
2. 07:47 AM - Re: Re: simple antenna for 704 mHz (rd2)
3. 01:44 PM - Re: 30A PM alternator and Z101? (johnbright)
Message 1
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| Subject: | Re: simple antenna for 704 mHz |
Rumen, did you resolve your antenna issue? If not, I may have a potential solution.
I've got a 'thru the roof' antenna I built for a local EMS member that's
too long (465 Mhz) that can be cut down to accommodate your target frequency.
It was originally intended to poke thru a metal roof via 5/8" hole and bond to
the inside surface for weather sealing. It would also work nicely thru a side
wall of the building.
It's only a 4" 'spike' protruding off the surface . . . unobtrusive. Easily removed
and patched in future.
I can dig it out and trim to your requirements.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507136#507136
Attachments:
http://forums.matronics.com//files/06062207531_212.jpg
Message 2
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| Subject: | Re: simple antenna for 704 mHz |
Bob, thanks, not necessary at this point -
- I ended up experimenting and building a coax 1/2 wave dipole antenna inspired
by a ham operator. I purchased some 15' of coax with SMA on one end, removed
the insulation at 1/4 Y, exposed 1/4 Y of the center conductor, folded back 1/4
Y of the braid over the coax and finished over w/heat shrink tubing, thus making,
as an extension of the coax, a quick and simple 1/2Y antenna not requiring
a ground plane. Inside my "faraday cage" the signal now is 6 dB better than
with the original antenna. Not enough, but more stable. If the box doesn't go
offline in future weeks/months, this temp solution becomes permanent, otherwise
will poke it out through a 1/4" hole on the side wall.
Rumen
----- Original Message -----
From: nuckollsr <bob.nuckolls@aeroelectric.com>
Sent: Mon, 06 Jun 2022 08:58:41 -0400 (EDT)
Subject: AeroElectric-List: Re: simple antenna for 704 mHz
Rumen, did you resolve your antenna issue? If not, I may have a potential solution.
I've got a 'thru the roof' antenna I built for a local EMS member that's
too long (465 Mhz) that can be cut down to accommodate your target frequency.
It was originally intended to poke thru a metal roof via 5/8" hole and bond to
the inside surface for weather sealing. It would also work nicely thru a side
wall of the building.
It's only a 4" 'spike' protruding off the surface . . . unobtrusive. Easily removed
and patched in future.
I can dig it out and trim to your requirements.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507136#507136
Attachments:
http://forums.matronics.com//files/06062207531_212.jpg
Message 3
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| Subject: | Re: 30A PM alternator and Z101? |
I exchanged emails with Bill Judge at Monkworkz. He expressed concern the battery
alternator's regulator could register an OV event if the battery alternator
relay was opened while the alternator is delivering significant current. What
I came up with is a progressive off / enable / on switch for the regulator and
a Schottky diode to shunt any voltage spike to the battery. Ref attached pdf
and its notes 2, 7, and 8.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/folderview?id=1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507139#507139
Attachments:
http://forums.matronics.com//files/elec_schem_with_monkworkz_mz_30l_as_backup_and_z101_as_a_template_rev_draft_3_165.pdf
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