From: Roman <rw3adb@YANDEX.ru>
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Date: Sat, 21 Jul 2018 01:16:08 +0300
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Subject: Re: LF: Optimizing Ferrite Rod Antennas - OT?
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Hi Tom

> Hi LF, Mike and Roman,
> 
> Thanks for your feedback! Sri, Roman, no more than five words of
> Russian here - so many interesting information being excluded! But
> at least the pictures tell a lot.

Yes, schematics and pic's give more ideas and some interesting info.
I think so ang give it for you specialy.
Tell me to know about your experiments and results in that field and I inform rusian forums about it.

If you know something to translate - email me pse personaly. I translate info for you to english a little bit.

Roman

> 
> Concerning once more ferrite antennas: another most interesting
> paper is the PhD dissertation of David Gibson:
> 
> Channel
> Characterisation and
> System Design for Sub-Surface Communications;
> 
> etheses.whiterose.ac.uk/4169/1/uk_bl_ethos_270894.pdf
> 
> Dealing primarily with
> communication tasks in caves and mines, especially in
> section 4 there
> is a lot of information about loop
> antennas with and without ferrite cores. The other
> sections are
> worth reading as well - many of the
> challenges in sub-surface communication seem to be
> similar to our own.
> 
> 73,
> 
> Tom, DK1IS
> 
> Am 20.07.2018 um 17:33 schrieb Roman:
> 
>> Hi LF, Mike, Tom!
>>
>> Will be helpful for anybody, but on russian language:
>>
>> Old discussion at 136.su russian LF forum about ferrite ants and DM4TR grabber with ferrite ant practical results:
>>
>> http://136.su/index.php/topic,119.0.html
>>
>> The other old discusion on radioscanner.ru forum:
>>
>> http://www.radioscanner.ru/forum/topic22993.html
>>
>> -Many practical results from different OM's into forum but on HF band mainly.
>>
>> Russian book - main hand-book of all ferrite antenna designers in Russia:
>>
>> Khomich V.I. - The receivig ferrite rod antennas, but on russian language only.
>>
>> http://www.radioscanner.ru/files/antennas/file1138/
>>
>> The wide-band ferrite rod original practic construction - OLUSHA-T from Sergey Zadorozhny from Kiev:
>>
>> http://sezador.radioscanner.ru/articles/solan-t.html
>>
>> 73!
>> Roman
>>
>>> Tom: Many Thanks for the link to Ben H. Tongues writings. I own and have restored both R-98 and R-20 Blonder-Tongue radios circa 1959 and 1960...(Ben H. Tongue of Blonder-Tongue Labs, Inc.)
>>>
>>> The R-98 design stacks the 10.7Mhz IF transformer in series on top of the 455 kHz IF transformer. An interesting approach to a dual band receiver.
>>>
>>> The design of the R-98 got me thinking if it was possible to build an optimized LF/MF dual band antenna transformer.... I am not sure if it is worth the effort, with the extra feed line, etc.
>>>
>>> The point is that ideas for LF/MF exploration can come from other aspects of the radio art...
>>>
>>> 73, Mike wa3tts
>>>
>>> -----Original Message-----
>>> From: DK1IS <DK1IS@kabelmail.de>
>>> To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
>>> Sent: Thu, Jul 19, 2018 4:59 pm
>>> Subject: LF: Optimizing Ferrite Rod Antennas - OT?
>>>
>>> Hello group,
>>>
>>> To whom it may concern: cleaning up my old laptop I happened to find a
>>> file from Ben H. Tongue dealing with the optimisation of ferrite rod
>>> antennas:
>>>
>>> http://kearman.com/bentongue/xtalset/29MxQFL/29MxQFL.html
>>>
>>> Coming originally from the crystal radio people some design aspects in
>>> the article could be interesting for our VLF, LF and MF work too - if
>>> not already known.
>>>
>>> 73,
>>> Tom, DK1IS
-- 
73!
Roman, RW3ADB