Brian wrote on June 6. Your 25mm x 3mm flat strip I make equivalent to the surface area of an 18mm dia tube in RF skin terms which is about the same diameter
Message 1 of 10
, Jun 7, 2013
Brian wrote on June 6.
"Your 25mm x 3mm flat strip I make equivalent
to the surface area of
an 18mm dia tube in RF skin terms which is about the same
as Welbrook use for the ALA-1530 !!!!"
The loop amplifier in question has a very low input impedance, hence there
will be a miss-match at MF and HF when using a loop with the above dimensions.
Whilst this may not be an issue for just nullinng out a pest. There will be
noticeable loss in s/n compared to Pixel and
Wellbrook loops that use higher input impedance amplifiers.
A very low input z amp. requires a much lower reactance loop. This is not
easy to achieve whilst maintaining a reasonable capture area.
Earlier this year I received updated Calibration data for the LFL1010
( same amp as the 1530, but a much lower input z ) and compared it to the
ALA1530. The net result was an approx. 10dB improvement is sensitivity at MF and
HF with the higher input z ALA1530.
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