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.
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 <[email protected]>
To: rsgb_lf_group <[email protected]>
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
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