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Icom antenna junction box

 
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speedy11



Joined: 29 Jun 2015
Posts: 45
Location: Port Orange, FL

PostPosted: Sun Feb 12, 2017 9:17 pm    Post subject: Icom antenna junction box Reply with quote

Dean,

I was one of those who was wondering if my "SL30 failure" might have been caused by the Icom junction box (I have mine wired like yours) but I just got word from the radio shop that the problem exists in the SL30. The radio is on the way to Garmin for a $500 repair.
So, at this point I cannot say the Icom unit is causing any issue.

Stan Sutterfield
RV-8A
Daytona Beach, FL


Quote:
Someone was asking on this forum about issues with the Icom antenna junction
box installed in their plane. I put in one of those in between my SL-30
Nav/Com and my belly antenna on the RV-6A. I've had a lot of scratchy and
not so great transmissions/reception on that Radio. I didn't think that
maybe if would be that junction box. I like the idea because it makes it
easy to plug in my hand held and use my outside antenna. But I've never had
to do that so if the junction box is causing crappy tx/Rx on that radio I'll
take it out of the loop. I know the SL-30 is a great radio so this has
puzzled me since I finished the RV. Did whomever it was figure out whether
the Icom junction box was causing radio Tx/Rx problems or not? Does the
junction box need to be removed from the loop or is there some I can do to
fix it?


Thanks

Dean Psiropoulos
RV-6A N197DM
Tarpon Sprgs, FL


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fly4grins(at)gmail.com
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PostPosted: Mon Feb 13, 2017 4:05 am    Post subject: Icom antenna junction box Reply with quote

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?

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nuckolls.bob(at)aeroelect
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PostPosted: Mon Feb 13, 2017 5:51 am    Post subject: Icom antenna junction box Reply with quote

At 06:02 AM 2/13/2017, you wrote:
Quote:
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?

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 . . .


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PostPosted: Tue Feb 14, 2017 3:45 am    Post subject: Icom antenna junction box Reply with quote

 >   Without putting one on the test bench I don't >  KNOW the degree of upset but we know that it's not >  zero.

Well now, as it happens, I've got one in a dusty box somewhere.  Knowing how bored you tend to get *grin* I'd be willing to send it your way if you are interested.


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nuckolls.bob(at)aeroelect
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PostPosted: Tue Feb 14, 2017 11:07 am    Post subject: Icom antenna junction box Reply with quote

At 05:42 AM 2/14/2017, you wrote:
Quote:
¬ >¬ ¬ Without putting one on the test bench I don't
¬ > ¬ KNOW the degree of upset but we know that it's not
¬ > ¬ zero.

Well now, as it happens, I've got one in a dusty box somewhere.¬ Knowing how bored you tend to get *grin* I'd be willing to send it your way if you are interested.

Sure. I'd like that . . .

The one I photographed was new out of the box
and did function well. Having one with some
effects of aging would be an interesting thing
to ponder.



Bob . . .


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