[ARC5] RBA-1 - Field Change #3.

[Kenneth G. Gordon]

On 16 Jun 2015 at 23:56, Roy Morgan wrote:

> On Jun 16, 2015, at 9:18 PM, Mike Feher <n4fs at eozinc.com> wrote: 
> > Wow - wonder what the incentive was to lower the receiver range by a mere 500
> > Hz? 73 - Mike 

Well, for one thing, at VLF "...a mere 500 kHz..." was a relatively large 
"distance".

> Cutler, Maine operated (and may still operate) on 17.8 kc.

Yes.

> Station NSS in Annapolis operated on 21.4 kc as I understand it, but other Navy
> VLF stations may well have operated just below 15 kc.

Back in the 1970s, when there were a lot more Navy stations on VLF, I was 
working for a fellow who was using those stations for VLF propagation 
research. None were below 16 kHz, as I remember it.

There was one in Panama, and another in North West Cape, Australia. 

NWC in Australia was copyable in Missoula, Montana 24/7/365. Although the 
signal level would drop pretty low during the day, it was always there.

There was another in Jim Creek, Washington. The signal level in Missoula, 
Montana was strong enough to copy with a short, wet string for an antenna, 
and a razor-blade for detector 24/7/365.

The antenna was pretty impressive, being strung between two parallel 
mountain ranges.

I used the Navy stations for code-practice at the time, since they were still all 
on CW at about 30 WPM, 5 letter code groups. I used a brand-new RAK for 
the inhaling duties.

Great fun, and darned good practice too.

Ken W7EKB