[GreenKeys] More TU-170 questions

[John, W9DDD]

Hi John,

Didn't even know there was an A version.

On the non-A version the 4 pin round connector is for connection to the 
transmitter AF in and PTT according to Harold's manual copy.
https://w6iwi.org/rtty/tu170/Flesher%20TU-170%20Terminal%20Unit.pdf

Haven't seen a manual for the A version on-line.



John, W9DDD

On 12/29/2020 9:08 PM, John Hargett wrote:
> Well , in reality, a question about the TU-170A ( no loop supply).   New
> 
>   To start with, *_new_* to all this TTY, but love the old machines.  
> Picked up 2 machines from Paul well pre -covid, and finally getting 
> around to trying to get them fired up.  I have several TU,  ( 2 - 
> TU-170A, an IRL FSK-1000, a CV-483C  and will have a Dovetron MPC-1000T  
> II ( not here yet)  The TU-170a's all power up, and I can get them 
> receiving on ITTY, also get the FSK-1000 to receive on ITTY, have not 
> yet tried the CV and waiting to see what shape the Dovetron is in.
> 
> 
> My question is about the TU-170a's.  The loop supply shows to connect to 
> the P2 connector on the back panel.  There is no info in the manual , 
> other than the schematic,  for P2.
> 
> pin 1=   DMOUT-TTL
> 
> pin 2=    +12V
> 
> pin 3 =    AFSKIN-TTL
> 
> pin 4=    GROUND
> 
> 
> Dont want to do any damage to the TU-170a's , so looking to the 
> knowledge of the Greenkeyers.
> 
> 
> Looking forward to getting on the air and joining in a QSO
> 
> Thanks in advance,
> 
> John
> 
> KG5YLG
> 
> 
> 
> 
> On the FSk 1000, is there any alignment information out there. Unit was 
> kind of dirty when I got it, and when first hooked up to ITTY, was 
> getting even meter movements for mark and space, but now the mark meter 
> is about half reading of the space.
> 
> On 12/27/2020 9:32 PM, w9ddd at tapr.org wrote:
>> Yes I took a short cut and didn't think about there being 2 fuses, especially if the parts list only shows one. Perhaps it's a case of the parts list only showing what's on the PCB.
>>
>> I'm thinking a 1 or 2 page addendum to the manual would be nice.  We could take the cleanest copy available and have someone  who can edit a PDF insert  the addendum.
>>
>> If I were bored with nothing else to do, I'd do a new schematic that combines all in one drawing.  Don't hold your breath.
>>
>> John, W9DDD
>>
>>
>>> On Dec 27, 2020, at 9:55 AM, Ralph Mowery<rmowery42 at charter.net>  wrote:
>>>
>>> John take a closer look at the schematic.  The .125 fuse is only in the DC
>>> loop supply side that is normally set for 60 ma max or 20 ma.  It seems to
>>> be one of the fuses that resembles a resistor and is wired in the circuit
>>> board.
>>>
>>>
>>> There is a much larger fuse that is in the AC line.  Looks like one of the
>>> 3AG type that is more common to most people.  It is not shown on the
>>> component schematic, but on the chassis wiring .  I did not see a rating for
>>> that one, but it should be high enough for the tu170 and the teletype motor
>>> circuits.
>>>
>>> Ralph ku4pt
>>>
>>>
>>>
>>> -----Original Message-----
>>> From:greenkeys-bounces at mailman.qth.net
>>> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Ofw9ddd at tapr.org
>>> Sent: Sunday, December 27, 2020 2:30 PM
>>> To:greenkeys at mailman.qth.net
>>> Subject: [GreenKeys] More TU-170 questions
>>>
>>> The SSR questions got me to looking in the manual again.
>>> No specs on the motor control SSR.
>>> They list the fuse as 1/8 amp.  Tracing the circuit diagram shows that the
>>> switched outlet is fed through that fuse.  I don't think that would work.
>>> Either the  drawing is in error or the fuse size must be wrong.
>>>
>>> When I return home I'm going to have to take the cover off to replace the
>>> meter lamp so I may as well investigate then unless some already has the
>>> answers.
>>>
>>> John, W9DDD
>>>
>>>
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