Hello Dimitris!
A lot of interesting info about ferrite rod ants and results, but on Russian
language:
http://136.su/index.php/topic,119.0.html
Use translator babelfish or other and use links and schematics.
At once - UA3AGC from Minussinsk, East Siberia NO66, nr Krasnoyarsk was
received in DM4TR location JO61de - QRB ~5000 km! - and VO1NA also too!
UA3AGC DE DM4TR
http://136.su/index.php/topic,18.msg7095.html#msg7095
http://136.su/index.php/topic,119.msg7099.html#msg7099
VO1NA DE DM4TR
http://136.su/index.php/topic,119.msg13881.html#msg13881
The ferrite rod ant was used on DM4TR grabber in great QRM from local MW
broadcast situated in near QTH - ~ 900m!
The great RX reports was in that situation!
The other great forum topic and results will be interesting for you on the
other russian forum:
http://www.radioscanner.ru/forum/topic22993.html
73!
Roman, RW3ADB
> Minor correction, the calculated relative permeability should be about
> 500, I made a mistake in the initial calculation. I just discover why
> they call it initial permeability (bad joke) :-)
>
> 73, Dimitris VK2COW
>
> Στις Σάβ, 12 Ιαν 2019 στις 2:48 μ.μ., ο/η Dimitrios Tsifakis
> <[email protected]> έγραψε:
>
>> Hi LF group,
>>
>> I have managed to acquire a few very large ferrite rods (36 cm x 10 cm
>> x 2 cm). The material is unknown but I managed to form a square
>> 'toroid' with four of them (they are heavy so gravity was enough to
>> keep everything in place for a measurement) and I measured about 15 uH
>> for 4 turns at 0.1 MHz, which if I have done the calculations
>> correctly implies a relative permeability of about 1000.
>>
>> The R of the impedance of the square loop was low (<0.2 ohm) at 0.1
>> MHz and it increased fast with frequency (170 ohm at 5 MHz!).
>>
>> The question is, what LF/VLF experiment would you do if you had half a
>> dozen of these rods?
>>
>> 73, Dimitris VK2COW
--
73!
Roman, RW3ADB
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