Today's Message Index:
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1. 06:40 AM - Archer Antenna in RV4 (Jeff Bertsch)
2. 07:06 AM - Re: Archer Antenna in RV4 (Stuart Hutchison)
3. 11:38 AM - Re: IVO Prop current limiter (kfav8r)
4. 11:56 AM - Master contactor catch diode failure (Joe Dubner)
5. 12:53 PM - Re: Master contactor catch diode failure (Robert McCallum)
6. 01:54 PM - Noisy radio system (Ryan)
7. 02:16 PM - Re: Master contactor catch diode failure (jdubner)
8. 02:40 PM - Re: Archer Antenna in RV4 (jdubner)
9. 06:52 PM - Re: Re: Archer Antenna in RV4 (Kelly McMullen)
Message 1
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| Subject: | Archer Antenna in RV4 |
Does anyone have experience installing an Archer Comm antenna in an RV4 wingtip?I'm
considering the Archer Model 1A and have concerns that it will fit properly.
ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A
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ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A
ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A These antennas have been designed by
Bob Archer from Torrance, CA uti... | |
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Thanks.
Jeff Bertsch
Message 2
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| Subject: | Re: Archer Antenna in RV4 |
I bought one each side for the wing tips of my Rocket Jeff, then learned
that only one was practical. In the end, neither was used due to
building tip tanks, so both are available for sale.
Usually US$100+ each I believe, but I will part with one or other for
US$60 each plus shipping.
Cheers, Stu
> On 27 Jun 2017, at 23:36, Jeff Bertsch <noms1reqd@yahoo.com> wrote:
>
> Does anyone have experience installing an Archer Comm antenna in an
RV4 wingtip?
> I'm considering the Archer Model 1A and have concerns that it will fit
properly.
>
> ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A
<http://www.aircraftspruce.com/catalog/avpages/archer_antenna1.php>
>
>
>
> ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A
> ARCHER SPORT AIRCRAFT COM ANTENNA MODEL 1A These antennas have been
designed by Bob Archer from Torrance, CA uti...
> <http://www.aircraftspruce.com/catalog/avpages/archer_antenna1.php>
>
> Thanks.
>
> Jeff Bertsch
Message 3
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| Subject: | Re: IVO Prop current limiter |
With Bob's prompting to move on to Plan B, I put together an Arduino-based IVOProp
"controller."
I bought an Arduino clone, a relay module, and a current sensing module, and wrote
a program to monitor the prop current. When the current goes above 9 Amps
for a sufficiently long time, the program opens the relay and shuts off the current.
The red and green LEDS are triggered to indicate the current flowing
and not flowing to the prop. The program leaves the relay open and the red LED
on for a few seconds so the pilot gets the message that a limit was reached.
I just ran the engine and put the prop through its paces, and the system seems
to work well. There might be additional tweaking to the code needed, but I think
it's pretty close to good.
I'll be happy to share the code and links to the components if anyone is interested.
--------
Doug
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470523#470523
Message 4
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| Subject: | Master contactor catch diode failure |
What would be the root cause of this charred diode and wiring?
https://i.imgur.com/e3FcBgf.jpg
https://i.imgur.com/Sl9foF6.jpg
This is in a friend's RV-9A and the diode was wired (properly) across the master
contactor's coil. The wire runs to the master switch (split-rocker type) where
a ground is applied. Both the contactor and the diode were supplied by Van's
Aircraft.
http://vansaircraft.com/cgi-bin/store.cgi?ident=1498576754-172-723&browse=electrical&product=master-sw
http://vansaircraft.com/cgi-bin/store.cgi?ident=1498576754-172-723&browse=electrical&product=diodes
This incident happened the instant the master power was turned on. Could the
diode have failed in a shorted condition, vaporizing itself and the wire when
the switch applied a ground?
After replacing the diode and wiring, operation seems normal.
--
Joe
Message 5
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| Subject: | Re: Master contactor catch diode failure |
The most obvious answer is that the original diode was installed backwards.
Maybe the supplied "packaged" assembly from Vans was incorrectly assembled under
the heat shrink causing full battery voltage and hence current to forward bias
the diode leading to its action as a fuse. The new assemblies shown in your
photos leave no possible clue as to the direction the encapsulated diode is
oriented. The external red band is fine and dandy, but if the diode under the
shrink was accidentally reversed there is no way to know without "testing". I
would suggest your "test" proved conclusively it was incorrect.
Bob McC
>
> ---------- Original Message ----------
> From: Joe Dubner <jdubner@yahoo.com>
> Date: June 27, 2017 at 2:55 PM
>
>
>
> What would be the root cause of this charred diode and wiring?
>
> https://i.imgur.com/e3FcBgf.jpg
> https://i.imgur.com/Sl9foF6.jpg
>
> This is in a friend's RV-9A and the diode was wired (properly) across the
> master
> contactor's coil. The wire runs to the master switch (split-rocker type)
> where
> a ground is applied. Both the contactor and the diode were supplied by
> Van's
> Aircraft.
>
>
> http://vansaircraft.com/cgi-bin/store.cgi?ident=1498576754-172-723&browse=electrical&product=master-sw
>
> http://vansaircraft.com/cgi-bin/store.cgi?ident=1498576754-172-723&browse=electrical&product=diodes
>
> This incident happened the instant the master power was turned on. Could
> the
> diode have failed in a shorted condition, vaporizing itself and the wire
> when
> the switch applied a ground?
>
> After replacing the diode and wiring, operation seems normal.
>
> --
> Joe
>
>
>
>
Message 6
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| Subject: | Noisy radio system |
OK, here goes.
Let me start this by saying I have tried pretty much every trick in the boo
k to solve this issue and yes the unit is wired to a high standard with sep
arate earth to battery, RG400 antenna cable etc etc etc.
I have a Trig radio installed in a Fairchild F24 with 145hp Warner engine.
It is constantly breaking squelch even with the internal squelch wound righ
t up. I have improved it by a huge amount but it is still pretty bad and at
high RPM makes the radio essentially useless.
It is an unshielded ignition harness so this is a good portion of the probl
em but I wondered if anyone may have any other ideas. Oh, by the way, the n
oise is coming in via the antenna as it goes away when the antenna is disco
nnected.
Things that have improved considerably were, taking a ferrite ring and loop
ing the antenna cable through it 4 times. more doesn't help and less doesn'
t help. Also changed to automotive plugs and resistor caps (5kOhm) which he
lped.
I get the impression that if I up the resistance a little further by going
to resistor plugs or leads that we may solve the problem but I'm concerned
about loading the windings in the mag to much and burning them out, would r
unning 5kOhm resistor plugs or resistance leads load the mags too much?
I will get a reduction in spark quality which may be unacceptable and cause
fouling but what do you guys think, worth a shot.
Last parting shot. The owner did the antenna install and it is an internal
antenna surrounded by the steel tube fuselage and this probably isn't helpi
ng. Worth trying an external antenna, although difficult to do at this stag
e with a finished aeroplane (fabric), I may be able to fit to one of the wi
ng route fairings to get a halfway decent ground plane.
Cheers,
Ryan
Message 7
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| Subject: | Re: Master contactor catch diode failure |
Bob McC wrote:
> The most obvious answer is that the original diode was installed backwards.
That was my initial thought too but the aircraft had 29 hours TTSN with that configuration.
The RV-9A owner told me this incident happened on the first master switch actuation
after battery replacement due to a totally discharged battery. There was
a battery charger involved but the owner assured me it was always connected properly.
And the master contactor actuated, at least momentarily, because the
Dynon EFIS turned on (and continued to run on its internal battery).
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470527#470527
Message 8
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| Subject: | Re: Archer Antenna in RV4 |
> Does anyone have experience installing an Archer Comm antenna in an RV4 wingtip?
> I'm considering the Archer Model 1A and have concerns that it will fit properly.
Jeff, I have the Archer NAVantenna mounted in my RV-8A's wingtip, which I believe
is similar if not identical to that of the RV-4. So taking your question literally,
I would say it will fit OK.
However . . . you didn't ask but I advise against it because of the performance
hit of the mostly horizontally-oriented antenna while VHF com requires vertical
polarization.
When I ran out of space for vertically-polarized antennas on the bottom of my '8A,
I mounted one on the bottom of a wing. The ground plane is larger and there's
plenty of separation for multiple antennas.
--
Joe
--------
RV-8A
Independence, OR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470531#470531
Message 9
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| Subject: | Re: Archer Antenna in RV4 |
I would agree. I have one Archer Nav antenna in each wing tip to serve 2
navcoms. Performance is okay. While my -10 has big enough wing tips to
do a vertical com, I wouldn't. A friend put one in -7 wingtip and it was
good for maybe 20 miles until he had the plane painted with a metallic
paint. Performance dropped to under 10 miles, so he abandoned and put
antenna on a convenient wing inspection plate.
On 6/27/2017 2:40 PM, jdubner wrote:
>
>
>> Does anyone have experience installing an Archer Comm antenna in an RV4 wingtip?
>> I'm considering the Archer Model 1A and have concerns that it will fit properly.
>
> Jeff, I have the Archer NAVantenna mounted in my RV-8A's wingtip, which I believe
is similar if not identical to that of the RV-4. So taking your question
literally, I would say it will fit OK.
>
> However . . . you didn't ask but I advise against it because of the performance
hit of the mostly horizontally-oriented antenna while VHF com requires vertical
polarization.
>
> When I ran out of space for vertically-polarized antennas on the bottom of my
'8A, I mounted one on the bottom of a wing. The ground plane is larger and there's
plenty of separation for multiple antennas.
>
> --
> Joe
>
> --------
> RV-8A
> Independence, OR
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470531#470531
>
>
>
>
>
>
>
>
>
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