[GreenKeys] ST-5

[John, W9DDD]

The main thing I remember is the 6 had a band pass filter at the input.  
And I think a threshold detector circuit.  Auto start?  I don't think 
the 5 had that.  Reason I don't recall is that I had built an external 
device with a relay and mechanical timer that monitored the loop.  
Worked great on VHF, on HF, I'm trying to recall if I still used that on 
the 20 meter auto start.  I know that wouldn't work these days with so 
many more signals on the band.

---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 5/4/2023 12:38 PM, Skip Macaulay wrote:
> What was the big difference between the ST-6 and the ST-5 ??   Skip
>
> Skip MacAulay
> VE6BGT
>
> On Thu, May 4, 2023, 11:24 AM John, W9DDD, <w9ddd at tapr.org 
> <mailto:w9ddd at tapr.org>> wrote:
>
>     I think the DT-500 was more like the ST-5.  The DT-600 was closer
>     to the ST-6.  I had both the ST-5 and the DT-500.  I perf-boarded
>     a DT-600/ST-6 hybrid too.
>
>     Details of all of that are ancient history, so consider the
>     possible memory degradation.  All are in a box of seventies era
>     RTTY stuff I that I put aside as I run across them while sorting
>     through 60 years of accumulation.  I hope to get to that stuff so
>     I can get back on the air RTTY wise.  It's the AF and RF side that
>     is lacking at this point.
>
>     The collection started with novice ticket in 1959 to FM repeaters
>     to RTTY to packet radio and too many computers. Sorting started
>     about ten years ago and I already regret some of the items that
>     went to the landfill.  Not that I still want them (well there was
>     that nice 19 supply), but I've learned that people are still
>     looking for the stuff.
>
>     ---
>     ----
>     You said "tomorrow" yesterday.
>
>     The above comments or recommendations are SWAG. Use at your own risk.
>     John, W9DDD
>
>     On 5/4/2023 10:45 AM, kn7sfz wrote:
>>     And wasn't the DT-600 project an attempt to put the ST-5 on a
>>     single board?
>>
>>     Richard kn7sfz
>>
>>
>>
>>     On 5/4/2023 6:57 AM, Steve wrote:
>>>     The ST-5 was an excellent HF RTTY demodulator. It was featured
>>>     as a construction
>>>     article in the ARRL handbook in the early '70's if I recall. I'm
>>>     still using the one
>>>     I built back then. The ST-6 is based on the ST-5 and very similar.
>>>     Steve W6SSP
>>>
>>>     __
>>
>>
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