[GreenKeys] ST-5

[Skip Macaulay]

Ok so it was still using the 88mh coils etc for the detector.. I thought
maybe that part was really different.. I had a auto start but it was a
seperate board.. This was hooked to my 19 unit.. Later when I got the 28 it
was geared for 100 wpm thus the addition of the UART gear shift circuit..
It had a auto start built in it also.. So both the 19 and 28 worked
together..  Now I have scrapped the older autostart and just using the ST5
and the UART together..  I did build a unit using 741 instead of the coils
for the detector once also..

Does anyone remember the MSO circuit??  Skip

Skip MacAulay
VE6BGT

On Thu, May 4, 2023, 11:47 AM John, W9DDD, <w9ddd at tapr.org> wrote:

> 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> 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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