K5WK inquired: > I received 5 xtals with my k3 which I am assembling. > Two had offsets marked on the side, these were the elecraft > 2.7 and .2. > Three from Inrad (1.8, 1, and .4) did not have a sticker > with offset on them. > Maybe these did not go thru the test at elecraft? Do xtals > always come with that white sticker on them if they have been > properly tested? > > Ken K5WK
KK7P replied: > > Three from Inrad (1.8, 1, and .4) did not have a sticker > with offset on them. > > The 8-pole filters have no offset, please use 0.0. > > 73, > > Lyle kK7P K6KR replied: > It's on page 74 of the owner's manual, in the Crystal Filter > Installation Appendix. > > 5-pole filters have a FREQ OFFSET marked on the side of one > of the crystals, e.g. -0.85. > > The offset for all 8-pole filters is 0.00. > > Dick, K6KR While it is true that the 8-pole filters are designed for no offset from the IF, in reality several of mine do have a significant offset ... that is, an offset large enough to warrant correction in the filter configuration in the CONFIG menu. For example, all of my 400 Hz filters are off by 80 Hz or so. Ironically, the 2.8 kHz filters are perfectly centered when a few tens of Hz one way or the other wouldn't matter. If you care about this it is easy enough to check the actual center position of all your crystal filters and configure in an appropriate correction where needed. 73, Ed - W0YK _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
