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, <[email protected]> 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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