Graham, The bandpass filter is usually sufficiently broad to cover most or all of 160 meters - so you have something abnormal. Check L5 - it should be 33 uH (orange-orange-black). Early K2s had an 820 ohm resistor across C14 to further broaden the 160 meter response, so you could try adding that to see if it helps.
73, Don W3FPR > -----Original Message----- > Gents, > I'm having difficulty getting decent power output across > the whole of the 160m band, I can tune up the bandpass filter to get 15 > watts at any point on the band but the level drops very quickly as I > tune either side of the peaked frequency.As an example If I peak up at > 1900Khz I have under 2 watts output at the band edges and a > corresponding loss of receive sensitivity.The performance on 80m is up > to spec. so I am guessing that this excludes a problem with L3 or L4. > Yes I've checked the component values & soldering to no avail so am > looking to the list for inspiration. > > Thanks, Graham G4cpd > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.16.9/622 - Release Date: 1/10/2007 2:52 PM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
