Collins 310W-1 Exciter Divider

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kcbooboo
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Re: Collins 310W-1 Exciter Divider

Post by kcbooboo » Tue Jul 04, 2017 5:03 am

Thanks to the exciter PDF, I looked up the Collins part number. That got me to an MC714G. There's a datasheetarchive PDF file of a 1966 Motorola semiconductor book, 22MB. There are LOTS of 8-pin metal (G) flip-flops there, in many different logic families. They have the outputs listed as 1/0 rather than Q/Qbar. Pin 8 is the positive supply pin, pin 4 is the negative supply pin. There are J-K, D, Set/Reset styles.

I found that handbook useful enough to post elsewhere. I bet you can find something with signals and pins that match what the exciter had. Of course an exciter schematic would be helpful, but as these are only used as a divide-by-two circuit, they can't be too critical. Section 13 of the manual has the digital ICs.

Go to http://www.repeater-builder.com/ then scroll down to "Technical Information", click that link, and the data book is at the end of the index page.

Bob M.

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Dale H. Cook
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Re: Collins 310W-1 Exciter Divider

Post by Dale H. Cook » Tue Jul 04, 2017 6:29 am

kcbooboo wrote:
Tue Jul 04, 2017 5:03 am
That got me to an MC714G.
Thanks - I'll have a look at the databook.
kcbooboo wrote:
Tue Jul 04, 2017 5:03 am
Of course an exciter schematic would be helpful
I have that - it is on the bedsheet print for the transmitter. Later this week (after I patch the tears) I will be getting that scanned and plan to post it with the scanned 820E-1/F-1 manual (including both exciter manuals).
Dale H. Cook, Contract Engineer, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcityeng/index.html

kcbooboo
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Re: Collins 310W-1 Exciter Divider

Post by kcbooboo » Tue Jul 04, 2017 7:33 am

The MC714G wasn't the right chip but it got me into the right section. At least you might find the proper semiconductor family (DTL, RTL, etc) and type of astable multivibrator (i.e. flip-flop) and can fashion something equivalent, even if on a piece of perf-board.

Bob M.

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Dale H. Cook
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Re: Collins 310W-1 Exciter Divider

Post by Dale H. Cook » Tue Jul 04, 2017 9:46 am

kcbooboo wrote:
Tue Jul 04, 2017 7:33 am
The MC714G wasn't the right chip but it got me into the right section.
The MC713G matches the pinout, but it is a low-power RTL chip so it should be a 3.6 volt chip. I will look through the book and see if I can find a better match.
Dale H. Cook, Contract Engineer, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcityeng/index.html

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Dale H. Cook
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Re: Collins 310W-1 Exciter Divider

Post by Dale H. Cook » Tue Jul 04, 2017 11:57 am

kcbooboo wrote:
Tue Jul 04, 2017 7:33 am
... and can fashion something equivalent, even if on a piece of perf-board.
A previous engineer did that with a 7474, but not very expertly, so I had to revise his work. I want to understand the original design as best I can to insure that the replacement works properly.
Dale H. Cook, Contract Engineer, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcityeng/index.html

kcbooboo
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Re: Collins 310W-1 Exciter Divider

Post by kcbooboo » Wed Jul 05, 2017 1:11 pm

Check the MC900/MC800 series on PDF pages 1260-1306: M902, M916, M926, M913, M920 are all RTL flip flops. This logic series accepts VCC=12V. There's probably nothing about the resistors and transistors inside that prevents it from operating with more or less voltage.

You could almost build the IC out of discrete components, but these days a dual flip-flop in one package is so common that you should use one of those, even if it's a CMOS part that will work better on a 6V supply. I have found that simple TTL ICs (gates, buffers) will work OK on more than 5V but the flip-flops won't.

Bob M.

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