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RT-359A transponder question



 
 
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  #1  
Old September 13th 06, 04:51 PM posted to rec.aviation.homebuilt
Lars
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Posts: 9
Default RT-359A transponder question

Anyone out there who knows the pinout of the rear connector of the ARC
RT-359A transponder? We just got an altitude encoder to go with the
unit (an ACK A-30) in hope for a little better reception from the ATC
when flying in controlled airspace...

The ACK installation manual is fine, giving the pin numbers to connect,
but I don't have the RT-359A manual so I don't know which pin is which.
The connector on the back side of the RT-359A is two staggerd rows of
flat pins, the top one with 12 pins and the bottom one with 11 pins.
There is also two round alignment pins, one on each side of the bottom
row. I haven't got the mounting bracket with the female connector out
yet, maybe the pin numbers are printed on that one, but it is in a
rather awquard place so I don't want to start ripping things apart
until i know how to finish the job.

BTW, the X-ponder is in a Jodel D119, SE-XED.

Ads
  #2  
Old September 14th 06, 01:21 AM posted to rec.aviation.homebuilt
[email protected]
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Posts: 8
Default RT-359A transponder question

Top row of pins are odd #s 1 to 23 right to left. Bottom row are even
#s 2 to 22 right to left.
PIN
3 Remote IDENT Sw
5 Remote IDENT Sw
9 Switched A+ OUT (+LV)
2 GND
11 MODE C COMMON
14 A1
13 A2
15 A4
19 B1
17 B2
16 B4
21 C1
18 C2
20 C4
10 D4
22 A+ INPUT
12 LIGHTING
1 GND
23 PWR JUMPER
8 PWR JUMPER

For 14 VDC operation, connect pins 8 and 23. For 28 VDC operation,
connect dropping resistor between pins 8 and 23. Hope this helps,

Steve

Lars wrote:
Anyone out there who knows the pinout of the rear connector of the ARC
RT-359A transponder? We just got an altitude encoder to go with the
unit (an ACK A-30) in hope for a little better reception from the ATC
when flying in controlled airspace...

The ACK installation manual is fine, giving the pin numbers to connect,
but I don't have the RT-359A manual so I don't know which pin is which.
The connector on the back side of the RT-359A is two staggerd rows of
flat pins, the top one with 12 pins and the bottom one with 11 pins.
There is also two round alignment pins, one on each side of the bottom
row. I haven't got the mounting bracket with the female connector out
yet, maybe the pin numbers are printed on that one, but it is in a
rather awquard place so I don't want to start ripping things apart
until i know how to finish the job.

BTW, the X-ponder is in a Jodel D119, SE-XED.


  #3  
Old September 14th 06, 10:51 AM posted to rec.aviation.homebuilt
Lars
external usenet poster
 
Posts: 9
Default RT-359A transponder question

Superb! Thanks.

Wonder if I dare power the encoder from the "Switched A+ OUT" pin. The
ACK manual recomends powering the encoder directly from the mains bus,
but that would require that we pull the fuse/circuit breaker before
startup or install a separate breaker for the encoder. Wonder why they
donīt recommend using the switched output? Itīs only a 60mA current
draw, but maybe it is the 420mA warm up current that is the problem...

/Lars

skrev:

Top row of pins are odd #s 1 to 23 right to left. Bottom row are even
#s 2 to 22 right to left.
PIN
3 Remote IDENT Sw
5 Remote IDENT Sw
9 Switched A+ OUT (+LV)
2 GND
11 MODE C COMMON
14 A1
13 A2
15 A4
19 B1
17 B2
16 B4
21 C1
18 C2
20 C4
10 D4
22 A+ INPUT
12 LIGHTING
1 GND
23 PWR JUMPER
8 PWR JUMPER

For 14 VDC operation, connect pins 8 and 23. For 28 VDC operation,
connect dropping resistor between pins 8 and 23. Hope this helps,

Steve

Lars wrote:
Anyone out there who knows the pinout of the rear connector of the ARC
RT-359A transponder? We just got an altitude encoder to go with the
unit (an ACK A-30) in hope for a little better reception from the ATC
when flying in controlled airspace...

The ACK installation manual is fine, giving the pin numbers to connect,
but I don't have the RT-359A manual so I don't know which pin is which.
The connector on the back side of the RT-359A is two staggerd rows of
flat pins, the top one with 12 pins and the bottom one with 11 pins.
There is also two round alignment pins, one on each side of the bottom
row. I haven't got the mounting bracket with the female connector out
yet, maybe the pin numbers are printed on that one, but it is in a
rather awquard place so I don't want to start ripping things apart
until i know how to finish the job.

BTW, the X-ponder is in a Jodel D119, SE-XED.


  #4  
Old September 14th 06, 07:37 PM posted to rec.aviation.homebuilt
Rob Turk[_1_]
external usenet poster
 
Posts: 10
Default RT-359A transponder question


"Lars" wrote in message
ps.com...
Wonder why they donīt recommend using the switched output? Itīs only a 60mA
current
draw, but maybe it is the 420mA warm up current that is the problem...

/Lars


Probably to make sure that the circuitry has warmed up and stabilised enough
by the time you switch on your transponder. I have not checked the ACK A-30
specs but it usually takes a few seconds after power-up for the circuit to
give accurate readings.

Rob


  #5  
Old October 1st 06, 07:21 PM posted to rec.aviation.homebuilt
Lars
external usenet poster
 
Posts: 9
Default RT-359A transponder question

Hi all!
I finally got the back end connector out, but was puzzled to find a
wiring slightly different from the one indicated above. Pin 8 and pin
22 seemed to be switched, the A+ input was to pin 8 and the jumper was
between pins 22 and 23. Can this be correct? The transponder has worked
fine as far as I can tell so I am reluctant to change anything... If
only I had the manual!

/Lars

skrev:

Top row of pins are odd #s 1 to 23 right to left. Bottom row are even
#s 2 to 22 right to left.
PIN
3 Remote IDENT Sw
5 Remote IDENT Sw
9 Switched A+ OUT (+LV)
2 GND
11 MODE C COMMON
14 A1
13 A2
15 A4
19 B1
17 B2
16 B4
21 C1
18 C2
20 C4
10 D4
22 A+ INPUT
12 LIGHTING
1 GND
23 PWR JUMPER
8 PWR JUMPER

For 14 VDC operation, connect pins 8 and 23. For 28 VDC operation,
connect dropping resistor between pins 8 and 23. Hope this helps,

Steve

Lars wrote:
Anyone out there who knows the pinout of the rear connector of the ARC
RT-359A transponder? We just got an altitude encoder to go with the
unit (an ACK A-30) in hope for a little better reception from the ATC
when flying in controlled airspace...

The ACK installation manual is fine, giving the pin numbers to connect,
but I don't have the RT-359A manual so I don't know which pin is which.
The connector on the back side of the RT-359A is two staggerd rows of
flat pins, the top one with 12 pins and the bottom one with 11 pins.
There is also two round alignment pins, one on each side of the bottom
row. I haven't got the mounting bracket with the female connector out
yet, maybe the pin numbers are printed on that one, but it is in a
rather awquard place so I don't want to start ripping things apart
until i know how to finish the job.

BTW, the X-ponder is in a Jodel D119, SE-XED.


  #6  
Old November 8th 06, 04:31 AM posted to rec.aviation.homebuilt
John_F
external usenet poster
 
Posts: 12
Default RT-359A transponder question


Your wiring will work fine. It just feeds the power switch in the
reverse direction but since it is just a switch it don't care which
way the current is through it.
Internally pins 8 & 9 tie togeather and go to the power switch "side
A"; pin 22 goes to the other side of the switch "side B". Pin 23 is
the true power input to the fuse and internal voltage regulator after
it goes to through the switch
John.

On 1 Oct 2006 11:21:41 -0700, "Lars" wrote:

Hi all!
I finally got the back end connector out, but was puzzled to find a
wiring slightly different from the one indicated above. Pin 8 and pin
22 seemed to be switched, the A+ input was to pin 8 and the jumper was
between pins 22 and 23. Can this be correct? The transponder has worked
fine as far as I can tell so I am reluctant to change anything... If
only I had the manual!

/Lars

skrev:

Top row of pins are odd #s 1 to 23 right to left. Bottom row are even
#s 2 to 22 right to left.
PIN
3 Remote IDENT Sw
5 Remote IDENT Sw
9 Switched A+ OUT (+LV)
2 GND
11 MODE C COMMON
14 A1
13 A2
15 A4
19 B1
17 B2
16 B4
21 C1
18 C2
20 C4
10 D4
22 A+ INPUT
12 LIGHTING
1 GND
23 PWR JUMPER
8 PWR JUMPER

For 14 VDC operation, connect pins 8 and 23. For 28 VDC operation,
connect dropping resistor between pins 8 and 23. Hope this helps,

Steve

Lars wrote:
Anyone out there who knows the pinout of the rear connector of the ARC
RT-359A transponder? We just got an altitude encoder to go with the
unit (an ACK A-30) in hope for a little better reception from the ATC
when flying in controlled airspace...

The ACK installation manual is fine, giving the pin numbers to connect,
but I don't have the RT-359A manual so I don't know which pin is which.
The connector on the back side of the RT-359A is two staggerd rows of
flat pins, the top one with 12 pins and the bottom one with 11 pins.
There is also two round alignment pins, one on each side of the bottom
row. I haven't got the mounting bracket with the female connector out
yet, maybe the pin numbers are printed on that one, but it is in a
rather awquard place so I don't want to start ripping things apart
until i know how to finish the job.

BTW, the X-ponder is in a Jodel D119, SE-XED.


  #7  
Old December 2nd 06, 05:48 PM posted to rec.aviation.homebuilt
Lars
external usenet poster
 
Posts: 9
Default RT-359A transponder question

Hi again!
I was away from this group for some time and didn't see John_Fīs
answer until today. I have had quite a bit of worries since it turned
out that the contact elements where missing in all but the used
positions, so we had to get new ones (at 10 bucks APEICE!). Now I'm
only waiting to lay my hands on a proper crimping tool to attach them
to the wires.

Anyway, it seems the wiereing was all wrong in the original
installation, where the power was fed to pin 8, and pin 22 and 23 was
tied together. I guess the Xponder would still operate under these
conditions (it has in fact done so for the last 20-odd years), but it
seems the power filtering and fuse section has been bypassed. Maybe not
so good... Wonder if I dare switch it back to the supposedley correct
wiring? Or maybe there is some quirq with our dear old box that
requires the filters to be bypassed?

/Lars

 




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