Keep in mind that on VHF and up S9 on S-meter is by definition as -93dBm on input (5uV) - it is 20dB difference from HF bands. I suppose it is respected for K3/P3 K144XV setup. Are there some exact valus (MDS, NF, S9 level) for old and new firmware versions? Maybe I missed them, let me know out of list in such case...
73! Lexa, OK1DST K3/100 #727 Dne 10.11.2010 4:55, N6JW napsal(a): > > I can certainly confirm this receive gain overcorrection problem on 2m. > > The "cpu sleep on rx" upgrade really helped cut back on the birdies. > Thanks! > > But the overcorrection of the 2m gain compensation stands out like a sore > thumb, particularly when one can actually see the relative amplitude of the > signal on the P3. Of course, this is "just a small matter of programming!" > and I'm sure we will get it right in due course. > > Thanks& 73 > > John, N6JW > > > > Jeff Cochrane - VK4BOF wrote: >> >> Hi Terry, >> Thanks very much for posting of those figures. >> Although I do not have test gear that can back those numbers up I can say >> that from my extensive on air testing that indeed, the 2M gain reduction >> was overdone and to somewhere in the region your figures are showing. >> The local (60+Km away) 2M FM repeater was normally S9+30db on earlier >> firmware releases (around release 3.97 or so) on my K3 and once I got to >> firmware revision 4.05 it had dropped to S9+5db, now that I am at revision >> 4.14 it is now S5! >> Nothing has changed at the repeater and all other radios tried with the >> same antenna at my location show at least S9+20db signal strength. (And >> usually full scale, it is an exceptional repeater, over 1500ft high and >> with 50watts output to a 6+db gain antenna, it is almost full scale on my >> handheld in the back yard here!) >> Even allowing that the other radios have optomistic S meters I cannot >> believe that they are all out by so much and by such a consistant amount. >> >> The overdoing of the 2m gain reduction has been the subject of a few >> emails I have sent to Elecraft and to this reflector and to date I have >> not heard an answer on the subject. >> >> Jeff Cochrane - VK4BOF >> Innisfail, QLD, Australia >> Elecraft K3# 4257 >> >> ----- Original Message ----- >> From: [email protected] >> To: [email protected] >> Sent: Wednesday, November 10, 2010 11:18 AM >> Subject: [Elecraft] K144XV receive gain >> >> >> After seeing several postings about the K144xv gain and experiencing >> issues myself, I did some testing. >> >> Comparing a K3/K144XV on 2m vs 6m. >> >> On version 3.97 firmware, on 6m -87dbm yielded a S9 signal with the PR6 >> preamp in but the internal preamp off - best setting. On 2m, this yielded >> a S9+5 signal with the internal preamp still off. >> >> After loading 4.12 or higher, the same -87dbm gave the same S9 on 6m but >> now only S5 on 2m and still only S7 with the internal preamp on. To >> achieve the same S9 reading, I had to increase the signal level to -72dbm >> with the internal preamp off. The release notes for 4.12 reference a gain >> change on the K144xv and by the results of the 3.97 test I agree, there >> was too much gain but instead of dropping 6 db or so, it appears that they >> dropped 15db. Hopefully this will be rectified in the near future. >> >> Terry Price - W8ZN ex K8ISK >> >> ______________________________________________________________ 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
