[Elecraft] Redundant 2.7Khz 5 pole filters - what a waste.

[Arie Kleingeld PA3A]

Julian,

About the filters being matched:
Officially they are not but set the offset for both filters on .77 and you
will have a fine pair for this BW.

Because:
- IF you listen at BW 2.7 in diversity, the filters might sound a BIT
different but that's never a problem because reception on the two antennas
is already different.
- and second, they do not have the same passband (within a dB) anyway

I have about this set of filters myself (I think about .15 apart) and they
work great, split as well as diversity. At the clubstation PI4D the K3 is
favourite transceiver, especially on the bands where we have more than one
antenna available in contests (160, 80, 40).

The rest of my filters in main and sub (2.1 and 400) are 8 poles, and so
'matched'. 

(FWIW:
For the main RX I also have a 5-pole 200.
During the CQ160 CW I sometimes cranked down to 200Hz, with two very
different antennas connected (vertical and beverage). The phase difference
between the 400 (8-pole) and 200 (5-pole) was there but not annoying because
the receive pattern itself already shifted with matched 400's. The switching
to the unmatched situation did not change much in the reception.)


73
Arie PA3A




-----Oorspronkelijk bericht-----


Is there a market in 2.7Khz 5 pole filters (that were pulled out and
replaced
by 2.8Khz ones after the kit was bought and built) ?

Could the two filters I have be considered a matched pair -.68 and -.85 ?

I wish I'd left them in the radio and bought a couple of 1.8Khz Inrad ones
instead of the 2x2.8s - but hindsight is 20/20 as they say.

73 Julian Vk4CMV