I find the 200Hz filter most useful to knock down adjacent QRM, ie.
during crowded contest conditions, not so much dealing with QRN. Try
opening up the bandwidth to 500-700Hz when QRN is bad. The brain
generally does a better job discerning a weak signal when there is more
noise bandwidth, but of course, depends on the operator. APF doesn't
seem particularly useful on very weak signals when a certain amount of
QRN is present either.
I had decent copy of 8Q7SP on QSB peaks on 160M last night with the
bandwidth set at 550Hz... no chance with anything much narrower.
73 Eric NO3M
On 11/28/2016 06:39 PM, N2TK, Tony wrote:
Tnx Ian,
On 80 and 160M this past weekend had the filter bandwidth set at 200HZ most of
the time due to the QRN. The NR helped a little. Just trying to find out if
worth the money to buy the new 200 HZ filter if I would really know the
difference.
73,
N2TK, Tony
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