[GreenKeys] SAQ VLF using 5-bit tape

[Richard Knoppow]

    I think we need to distinguish between the marine radio 
operation of KPH and the RCA Communications point to point 
service which was also run from Bolinas Point. The marine service 
through KPH was telegraph with later some RTTY to ships at sea 
while the RCA Communications service ran some large number of 
circuits to Pacific Rim countries. KPH was connected via wire 
telegraph. Richard Dillman could supply details. The messages to 
be sent and received from ships would be relayed by telegraph. I 
suspect these circuits were machine code both ways and later 
Teletype.
    I also do not have specific information about RCA 
Communications other than at some point they used an RCA patented 
synchronous teleprinter system with automatic error correcting. 
These were multiplexed transmissions but, again, I don't have 
specific information on them. This was a different service from 
KPH or Radiomarine although the stations were in the same 
location. I think RCA also had radio telephone service to Hawaii 
and remember hearing them set up calls.
    AT&T also had radio telephone service to Hawaii and I think 
to ships at sea. I used to hear them setting up but don't have 
any details.

On 12/25/2021 12:20 PM, Jim Cooper wrote:
> On 25 Dec 2021 at 12:32, Harold Hallikainen wrote:
> 
>>
>> There have been some interesting
>> approaches over the years. I think KPH
>> used high speed Morse from punched
>> tape and received to a tape "chart
>> recorder" that would then be decoded
>> by hand.
> 
> That's the way the undersea cables worked also ...
> they had such a setup at Mackay Radio in the
> 1970s when I worked there in the M28 Lease Line
> section ... I got to see the NYC-Havana high-speed
> morse room once!   Incoming, the weak signal on the
> cable went into a gigantic round electromagnet with
> an armature in the core, which moved an ink pen
> back and forth to draw an ink line on narrow paper
> tape, which was then read by an operator at a keyboard;
> if the cable was working well that day, they could run
> up to about 100wpm ...
> 
> w2jc
> 
> 
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL