I left the offset of my main RX 2.7k filter alone, as I figured that would be best for TX. Then adjusted the SUB RX filter offset to match the main, as no TX takes place thru that filter.
Can't say I notice any difference with the SUB RX performance, but diversity now works great. 73 Stewart G3RXQ Thu, 25 Feb 2010 09:14:33 +0100, Arie Kleingeld PA3A wrote: > 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 > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
