Hi all, Same here as Stewart and I replied already on an older tread on the same subject. Meanwhile I found out the following and forwarded that info, including an MP3 recording of the various settings, to Lyle of the Elecraft team, who responded to my post.
The procedure to reproduce this is very simple. Tune on a continuous signal (e.g. in Europe we have a "rattle sig" on 7017.58, with strength S7~9. Switch off K3. When switching the K3 on again you'll hear for a short instance (0.1~0.2 sec) the signal without AGC and at 'default' BW => LOUD ! This is even visible because while the sig is that loud for this short period the S meter is at 0. Then the S-meter comes up to the S7~9 level, the audio goes to normal levels at the same time. Also the BW icon defaults at 500Hz (and I think the real BW as well) until the RX is ready and is set to the last used BW. OK, just did some further testing, very interesting: 1. BW_DSP=2.7kHz + 2.7kHz stock filter -> not audible effect 2. BW_DSP=2.1kHz + 2.1kHz filter -> effect audible but not very loud, sounds as 'click' 3. BW_DSP=1kHz + 2.1kHz filter -> same as 2, bit louder. 4. BW_DSP=500Hz + 0.5kHz filter -> effect audible and loud 5. BW_DSP=250kHz + 0.25kHz filter -> effect audible and loud The effect is not always as loud, it just depends how the power up switching coincides with the (non-constant) signal. I have the strong impression that somehow this is a receiver boot sequence issue related to the default BW setting early in the boot sequence ... Other relevant settings: Available roofing filters: FL1=2.7 FL2=2.1 FL3=<empty> FL4=0.5 FL5=0.25 Frontpanel: CW AGC-F SHIFT central NB Off NR Off MENU: AFX MD delay 5 CONFIG: AGC-S 020 AGC-F 100 AGC THR 003 AGC SLP 015 AGC PLS nor AGC HLD 000 AF LIM nor 030 AF GAIN HI LIN OUT nor 015 SUB AF balance SPKR+PH no SPKRS 1 <unqoute> So you can test a bit for yourself with these settings and see if you can reproduce this behaviour. I have not received an answer from Lyle yet, but I am sure he is digging into this as I type this ... -- Enno, PF5X Stewart Baker wrote: > > Hi, > Since installing MCU 2.73. I have noticed that power on is > accompanied by a number of loud, rather unpleasant clicks/clunks > from the speaker. > > 73 > Stewart G3RXQ > _______________________________________________ > 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 > > -- View this message in context: http://n2.nabble.com/K3---2.73-1.98--Clicks-on-Power-On-tp1647266p1648077.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
