My understanding is that you peak the gain at 145.5 in order to achieve a reasonable compromise between gain and noise figure at the low end of 144 ..
de w1rt/john On 2/22/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Hi Guys > > Thanks Don, Matt and others answering on my issue. > > I have now seen the light. I was deeply in to a engineering mode, where i > tried to do everything according to spec. The spec on the XV144 say > IF input from 28MHz to 30MHz and a output from 144-146 MHz. Then the thing > need to operate in that area and the natural place for alignment > would be 145MHz in the midt of the window. And being in engineering mode my > thinking was that the K2 was designed to match the XV144 > > Now you guys brought me back to real world. Why would I run the transverter > with K2 That do not do FM above 144.8, that in Denmark are > the border line to the the FM area (144.8 and up.) > > So trying to cover most used areas for CW and SSB i should properly align at > 144.3. Where the output from K2 should be at full level and no > issues should be seen. > > Sometime i guess my education is of no use where looking at all the spec and > stuff are the thing to do, when just a little common sense it > needed. :-) > > Br. > > OZ1BZJ Michael > > A engineer proberly expirence what one rock band has called a Momentary Lapse > of Reason > > > > > > > > > > On Tue Feb 21 23:15 , "Don Wilhelm" sent: > > > Michael, > > That is normal - the K2 spec for 10 meter coverage is 28.0 to 28.8 MHz at 10 > watts output and it falls off more rapidly at the high frequency end than > the low end. > You may be able to increase the usable coverage at the expense of the > maximum available output by peaking the 10 meter bandpass filter at some > frequency higher than the 28.2 point that is indicated in the manual. I > would suggest peaking at 28.8 or even higher if you need to achieve good > power output over the entire 28.0 to 30.0 MHz. If you do that, check the > maximum power output at both ends of your chosen band and try to balance the > maximum available power at both ends - adjust the peaking frequency up or > down to achieve good coverage over your desired range. > > 73, > Don W3FPR > > > -----Original Message----- > > > > The SSB Firmware was ok, version 1.8 so no problem there. > > > > Now i have found the issue on the K2, but not the solution. The desribed > > issue seen on the low power out are comming from the 28-30 Mhz. > > if i check > > indicated power by the internal powermeter it drops over the > > freq. with the > > power set for 5W i do reach 5.4 W on 28 Mhz at 29 Mhz it is 4,9, still ok > > but at 30 Mhz it is down at 0,3 W > > So trying 10 W 29 Mhz only goes to same 4.9, so a rolloff on increasing > > freq. are seen. Proberly normal, but passband seems to be to narrow ??? > > > > > > Any idea is this normal ?? > > Thanks in advance > > > > Br. > > > > OZ1BZJ > > Michael > > > > > _______________________________________________ > 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 > _______________________________________________ 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
