[NLRS] IC271/IC471 connector DE KA0RYT

[Dr. Gerald N. Johnson]

On Fri, 2007-03-23 at 06:24 -0700, Ronald Bergantzel wrote:
> 
> HELLO ! Donn , it appears that you are correct on the
> connector - Although , I picked up 2 of the connectors
> at a hamfest several years ago including the pins . I
> do not know what the application that is being used on
> the 271 / 471 , BUT be careful on the current draw on
> the PTT circuit. The specific PTT current draw I
> needed ran close to ICOM's specs , so I installed a
> 2n2222 additional 'PTT driver' inside my 471 to
> accommodate my needs ...... 73, Ron KA0RUT   
> --- Donn Baker <wa2vii at mail.minter.net> wrote:
> 
> > 
> > 
> > Hi Dennis,
> > I sent this a day or so ago, but have not seen it
> > come back on the
> > reflector... one more try, and this time on NLRB.
> > 
> > Good luck.
> > 73 Donn
> > WA2VII/0
> > 
> > 
> > Hi Dennis,
> > Question: do you mean the "CW KEY" or the "key line"
> > (i.e., PTT, etc.) ?
> > The big AUX connector is white Nylon and has a whole
> > bunch of control lines
> > in it.
> > 
> > Dig-Key has them, and the contacts you'll also
> > need. <www.digi-key.com>
> > 
> > There are two plus available; DK part number
> > WM1229-ND (w/mounting ears)
> > and WM1219-ND (w/o ears).  You will also need to
> > order 0.063 male contacts.
> >  WM1000-ND is for 18-24ga wire, while WM1002-ND is
> > for 24-30ga wire.  I
> > think the minimum number of contacts you can order
> > is 10.  You'll most
> > likely need a couple of spares, so....
> > 
> > I don't KNOW that these are the same parts, but the
> > dimensions and the
> > keyways match EXACTLY.
> > 
> > 73 Donn
> > WA2VOI/0
> > 
> > At 22:16 20-03-07 -0400, Mike Rhodes wrote:
> > >dallen wrote:
> > >> Hello VHF'ers:
> > >>
> > >> Does anyone know what the part number is for the
> > mating connector to the
> > aux
> > >> connector on the back of an ICOM IC-271A and or
> > IC-471A, the one that has
> > >> the keyline brought out.
> > >>
> > >> Next is it available somewhere?
> > >>
> > >> Thanks for any and all info, I appreciate it,
> > >>
> > >> 73, Dennis N9TZL
> > >> ------
> > 

In my IC-211 file I have a sheet listing the connections on the 24 pin
accessory connector. I have no confidence it matches the 271.

1. Output from Discriminator.
2. 13.8 v. in conjunction with power switch operation.
3. Connected to push-to-talk. T.R. change-over switch. When grounded,
set operates in transmission mode.
4. Output from receiver detector stage. Fixed output regardless of AF
output or AF gain control level.
5. Audio input.
6. DC 9v available when transmitted. (relay can not be directly
actuated.)
7. Input for external ALC voltage.
8. Ground.

9 through 14, no connection.

14 x control on 245.
15 Lock Input to lock dial externally.
16. UDC Input to control up-down eterenally.
17. Scan Input to can frequency.
18. CL Input to clear frequency.
19. FCL Input to clear counter in specified digit and input for MB data.
20. K0 Input for frequency control data.
21. K1 "
22. K2 "
23. K3 "
24. K4 "

I didn't chase the circuits through the schematic, but the +9 TX is
probably from a small switching transistor/voltage regulator. The PTT
may well be in parallel with the PTT button on the microphone. Probably
a current of 10 ma or less would be safe on each. A power MOSFET with
its gate to the +9 TX and a 10K resistor to ground should switch as much
as the MOSFET will handle and protect the exciter.


-- 
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer