Today's Message Index:
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1. 04:05 AM - Re: Icom antenna junction box (GLEN MATEJCEK)
2. 05:51 AM - Re: Re: Icom antenna junction box (Robert L. Nuckolls, III)
3. 08:06 AM - = = = PIDG SPLICES ARE SOLD OUT = = (Robert L. Nuckolls, III)
4. 08:49 AM - Re: Z-17/ alternator wire protection (blues750)
5. 09:02 AM - Re: Z-17/ alternator wire protection (user9253)
6. 09:05 AM - Re: Z-17/ alternator wire protection (blues750)
7. 11:42 AM - "slow blow" ? (Ken Ryan)
8. 12:44 PM - Re: "slow blow" ? (Robert McCallum)
9. 06:34 PM - Re: "slow blow" ? (Robert L. Nuckolls, III)
10. 06:35 PM - Red/Blue PIDG tool (Robert L. Nuckolls, III)
11. 07:13 PM - Re: "slow blow" ? (Ken Ryan)
12. 07:17 PM - Re: Red/Blue PIDG tool (johnbright)
13. 08:42 PM - Z12-Question (don van santen)
Message 1
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Subject: | Re: Icom antenna junction box |
Lo those many days ago that I tinkered with radios a little, keying the mic
without a load connected would likely fry the transmitter. Is it possible
that a crappy connection internal to the splitter box could be damaging the
current crop of radios over time?
Message 2
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Subject: | Re: Icom antenna junction box |
At 06:02 AM 2/13/2017, you wrote:
>Lo those many days ago that I tinkered with
>radios a little, keying the mic without a load
>connected would likely fry the transmitter.=C2 Is
>it possible that a crappy connection internal to
>the splitter box could be damaging the current crop of radios over time?
An excellent notion to ponder . . . the root
concern about the Icom Antenna j-box is the
quality of the normally-closed switch contacts
that automatically disconnect the panel mount
radio from the feedline when the hand-held
coax is plugged in.
A secondary concern is loss of feedline integrity
with the inclusion of simple, single strands of
wire used to make up connections within the box.
Without putting one on the test bench I don't
KNOW the degree of upset but we know that it's not
zero.
The very first all solid state transceiver I
brushed elbows with was installed in the T-41
trainers we built for the USAF back in the 1967
time frame. These were C-172s with engines out
of the C-337 (0-360, 210 hp). Always flown as
a two-place a/c (but with a compliment of heavier
military avionics) this made for a VERY snappy
C-172.
Intended for use at the USAF Academy in Colorado,
the extra horsepower was very welcomed for
student training in the rarified air of the
high plains.
Part of the standard equipment was a little
solid state, panel mount style transceiver
mounted back in the tail and crystals installed
only for 121.5 Mhz only. I'd never heard of
the brand before and now don't recall it . . .
but I do recall that several radios were toasted
during production test and trouble shooting phases
due to transmission into open feedlines.
This was long before the manufacturers figured
out how to built an SWR detection system into the
radio to effect automatic shutdown of the transmitter
when SWR was too high. Further, the early VHF
power transistors were rather intolerant of hi SWR
to begin with.
Modern radios are probably the much more robust,
MOS-FET output stages and will include auto-shutdown
for high SWR. However, a dodgy switch in the Icom
antenna j-box could very ell contribute to noisy
rformance of the radio.
Bob . . .
Message 3
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Subject: | = = = PIDG SPLICES ARE SOLD OUT = = |
The splices on hand are all spoken for.
There's a young man who drops by my house
most days after school to help around the
shop. We'll set him to stuffing and addressing
envelopes this afternoon!
Thanks guys.
Bob . . .
Message 4
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Subject: | Re: Z-17/ alternator wire protection |
No, it's because the alternator output is
a loop that goes to zero current when
opened anywhere in that loop . . . one
fuse suffices for both leads.
Would I be assuming correctly this is also true for a three phase PMA?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466129#466129
Message 5
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Subject: | Re: Z-17/ alternator wire protection |
No, to stop three phase current, at least two of the three phases must be opened.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466131#466131
Message 6
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Subject: | Re: Z-17/ alternator wire protection |
Agree...found my notes on this topic along with a drawing by Bob on how to disconnect
3 phase PMA. [Rolling Eyes]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466132#466132
Message 7
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The following statements appear in the (sometimes poorly translated) Rotax
914 installation manual:
"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
"Each of the two fuel pumps has to be protected by y slow blowing 5A fuse
in accordance with wiring diagram..."
"The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse
in accordance with the wiring diagram..."
Do you guys think they actually mean to call for slow blow fuses (as
opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when
compared to breakers? Or did I get that backwards?
Ken
"the rectifier-regulator has to be protected by a slow blowing 50A fuse or
a circuit breaker"
Message 8
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Subject: | Re: "slow blow" ? |
Ken;
Fuses are generally "faster" than breakers. "Slow blow" fuses will hold greater
overloads for longer before melting, thus the term "slow to blow". They will
still usually be faster than an equivalent breaker. The greater the overload
magnitude the faster the protective device opens in most all situations whether
it be a fuse or a breaker.
Bob McC
---------- Original Message ----------
From: Ken Ryan <keninalaska@gmail.com>
The following statements appear in the (sometimes poorly translated) Rotax 914
installation manual:
"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
"Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in
accordance with wiring diagram..."
"The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in
accordance with the wiring diagram..."
Do you guys think they actually mean to call for slow blow fuses (as opposed to
"regular" auto fuses)? Aren't fuses already "slow blow" when compared to
breakers? Or did I get that backwards?
Ken
"the rectifier-regulator has to be protected by a slow blowing 50A fuse or a
circuit breaker"
Message 9
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Subject: | Re: "slow blow" ? |
At 01:37 PM 2/13/2017, you wrote:
>The following statements appear in the (sometimes poorly translated)
>Rotax 914 installation manual:
>
>"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
Use MAX30 + inline holder
>"Each of the two fuel pumps has to be protected by y slow blowing 5A
>fuse in accordance with wiring diagram..."
An ATC5 in fuseblock is probably just fine.
>"The TCU (turbo control unit) has to be protected by a slow blowing
>2A fuse in accordance with the wiring diagram..."
An ATC3 in the fuseblock is recommended.
>Do you guys think they actually mean to call for slow blow fuses (as
>opposed to "regular" auto fuses)? Aren't fuses already "slow blow"
>when compared to breakers? Or did I get that backwards?
Compared to breakers, ALL fuses are faster than greased
lightning. Then too, 'slo-blo' fuses are a tiny fraction
of the fuse market and not available in our favorite
plastic package.
If you get nuisance trips, upsize the 'fast' fuse to
one step.
Bob . . .
Message 10
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Subject: | Red/Blue PIDG tool |
Just ran across an offering of the venerable
AMP 59250 PIDG crimper on ebay
http://tinyurl.com/grw4bdg
I've still got the first one I ever owned. Bought
it while I worked at Cessna the first time. I've
purchased two more since. The price of this
offer on eBay is VERY reasonable for this tool.
Bob . . .
Message 11
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Subject: | Re: "slow blow" ? |
Thanks Bob!
On Mon, Feb 13, 2017 at 4:56 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 01:37 PM 2/13/2017, you wrote:
>
> The following statements appear in the (sometimes poorly translated) Rotax
> 914 installation manual:
>
> "the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
>
>
> Use MAX30 + inline holder
>
> "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse
> in accordance with wiring diagram..."
>
>
> An ATC5 in fuseblock is probably just fine.
>
>
> "The TCU (turbo control unit) has to be protected by a slow blowing 2A
> fuse in accordance with the wiring diagram..."
>
>
> An ATC3 in the fuseblock is recommended.
>
>
> Do you guys think they actually mean to call for slow blow fuses (as
> opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when
> compared to breakers? Or did I get that backwards?
>
>
> Compared to breakers, ALL fuses are faster than greased
> lightning. Then too, 'slo-blo' fuses are a tiny fraction
> of the fuse market and not available in our favorite
> plastic package.
>
> If you get nuisance trips, upsize the 'fast' fuse to
> one step.
>
>
> Bob . . .
>
Message 12
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Subject: | Re: Red/Blue PIDG tool |
Does it do a better job for typical home builder versus RCT-1?
--------
John Bright, RV-6A, at Finish Kit
Continental Titan IOX-360, 8.5:1, vertical sump, SDSEFI EM-5, injectors in heads.
Aeroelectric Z-12.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466157#466157
Message 13
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Bob,
No arguments with the Z13/8 being the most robust system for the dollars
spent. The only thing I do not like about it is having to give up perfectly
good devices due to an insufficient source of electrons to drive them. Z12
has the power, but not the "layers".
Is it possible/easy to have a parallel battery contactor and switch to
actuate it? If not than how about a 2 rear replacement cycle for the
contactor and switch? I already do the the annual replacement of the PC680
battery. Any thoughts on this?
Thanks, Don
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