[GreenKeys] More LXD tape reader

[Nick England]

LXD7 is also used in the AN/FGC-56 28ASR (a Model 28 used by the Army -
weird!). The FGC-56 parts book shows a transmitter using the 174421 and
174422 filter.

Here's an LXD31 wiring diagram showing a transmitter that uses those same
filters.
https://www.navy-radio.com/manuals/tty/wd/7094wd-iss2.pdf

Nick England K4NYW
www.navy-radio.com


On Fri, Jul 29, 2022 at 7:31 AM Nick England <navy.radio at gmail.com> wrote:

> I found a document that says LXD7 was also used in the AN/FGC-56 and
> FGC-58 model 28ASR. I found a parts manual on line (TM11-5815-263-34P) but
> no schematic yet. If these were Navy units I'd know where to look, but
> these were Army M28 units (weird!). Maybe you know what manual number to
> look for that might have a schematic.
> Parts pages for the LXD7 transmitter are attached.
>
> So does the contact wiggler go back and forth when you are reading tape?
> If it ain't wiggling, the contacts ain't gonna do anything.
>
>
> Nick England K4NYW
> www.navy-radio.com
>
>
> On Fri, Jul 29, 2022 at 6:05 AM Nick England <navy.radio at gmail.com> wrote:
>
>> Teletype made hundreds of variants of basic assemblies such as the LXD.
>> So how do you tell the difference between an LXD6 and LXD7 for example?
>> The Analysis Chart !
>> https://www.navy-radio.com/manuals-ttycorp.htm#analysis
>>
>> Fortunately Jim Haynes rescued a few of these rare beasts. Unfortunately
>> the LXD one is among the missing.
>> So your best chance is finding a wiring diagram that includes LXD7 along
>> with other variants. It might include a note about the transmitter box.
>> Sometimes the parts manual will include differences.
>>
>> More later today.
>> Nick
>>
>>
>>
>> On Thu, Jul 28, 2022 at 10:16 PM Duncan Brown <duncanancy at earthlink.net>
>> wrote:
>>
>>> Having been assured that the motor in this M28 tape unit is correct
>>> (even though the leads were short), I've progressed to being able to
>>> move tape through the machine and confirm that the  "tight tape" and
>>> "tape out" functions are working.
>>>
>>> But no signal out. I traced the signal back to the connector that the
>>> LXD7 plugs into, so the next step was to check the contacts in the
>>> Signal Contact Box. I removed the nut on the top of the box and the
>>> cover is loose, but I can't get  the cover off due to interference with
>>> an arm of the Front Plate.
>>>
>>> How do I get the top off the Contact Box to  check the contacts?
>>>
>>> I see there are a variety of contact boxes used with the LXD tape
>>> reader.  How do I know which one was used with the LXD7?
>>>
>>> Thanks,
>>>
>>> Duncan
>>> K2OEQ
>>>
>>>
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