Hi John!
VY glad about that info was interested for you!
Alexander RN3AUS make an experiments with 11 Hz here, but in near zone. Not so
long distance.
This is experiment and joy-toy, but no communication for caves -)
If I know any news about VLF communication for caves here - I let you to know!
73!
Roman
> Roman,
>
> Many thanks for pointing these out. Some aspects of the French experiment
> were also described in CREGJ 89 and 92.
>
> FERRA was also mentioned in CREGJ 89.
>
> John Hey (SK) would be delighted for his cave radio to be described as
> “Professional”. It undoubtedly was of that standard, but was not manufactured
> commercially as we could not find a company to do that. Many people built
> Heyphones, over a hundred sets were built and approximately 80 were built by
> John himself.
>
> 73 John F5VLF
>
>> On 23 Jul 2018, at 19:41, Roman <[email protected]> wrote:
>>
>> Hi John, LF!
>>
>> The radioamateur experiment in France several years ago with 3.3 khz PSK31
>> communication in caves.
>>
>> http://f6kcz.free.fr/Actualites/2011/Carrieres%20Fleury/Carrieres%20Fleury.htm
>>
>> Profesional cave phone:
>>
>> http://bcra.org.uk/creg/heyphone/
>>
>> Russian communication system FERRA from Omsk radio-factory:
>>
>> http://www.radioscanner.ru/forum/topic46535-3.html
>>
>> 73!
>> Roman
--
73!
Roman, RW3ADB
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