[Elecraft] BCB sensitivity [K3]
>Is sensitivity very low below about 1000khz in the BC band or is it just me? Something to keep in mind, there is gigantic difference in the BCB performance on my K3 depending on what antenna I have it connected to and the results are counterintuitive. On a BCB station I am listening to at 790 KHZ right now hooked up to a resonant 20M dipole the S reading is 10 over S9. When I shift to a 40M inverted V the signal drops to S4 with ATU and S3 with ATU in bypass. The difference is gigantic. A resonant 40M antenna seems to be a particularly bad BCB performer. The 20M dipole has a Balun, the 40M inverted V does not. Sometimes the ATU helps and sometimes the ATU hurts signals on the BCB. Mike Scott Tarzana, CA ___ 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] BCB sensitivity [K3]
Mike, How do you tune the ATU optimally for BCB, since you can't transmit? Windy KM5Q Sometimes the ATU helps and sometimes the ATU hurts signals on the BCB. ___ 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
Re: [Elecraft] BCB sensitivity [K3]
You can set the KAT3 menu config entry to LCSet. Exit the menu then tap ATU TUNE. You can set the L and C values individually with the A and B VFO controls. But it doesn't seem to make any difference in the AM received signal as far as I can tell. I'm using a 100' wire for an antenna. 73, Drew AF2Z On Fri, 18 Jul 2008 22:53:52 -0600, KM5Q wrote: >Mike, > >How do you tune the ATU optimally for BCB, since you can't transmit? > >Windy KM5Q > >> Sometimes the ATU helps and sometimes the ATU hurts signals on the >> BCB. ___ 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
Re: [Elecraft] BCB sensitivity [K3]
Also, while dialing in the L and C values, tap ANT to switch between CA and CT. However, it seems you can't adjust the two caps independently; whatever value is dialed in for CA is duplicated for CT, and vice versa. Is this a bug? 73, Drew AF2Z On Sat, 19 Jul 2008 08:16:37 -0400, AF2Z wrote: >You can set the KAT3 menu config entry to LCSet. Exit the menu then >tap ATU TUNE. You can set the L and C values individually with the A >and B VFO controls. But it doesn't seem to make any difference in the >AM received signal as far as I can tell. I'm using a 100' wire for an >antenna. > >73, >Drew >AF2Z > > ___ 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
Re: [Elecraft] BCB sensitivity [K3]
Ok..., it seems the ANT switch, which is supposed to be switching between CA and CT while in the LCSet mode, is actually switching antennas as it would do in normal operation. I guess this is a bug, unless I'm doing something wrong here... 73, Drew AF2Z On Sat, 19 Jul 2008 08:30:44 -0400, AF2Z wrote: >Also, while dialing in the L and C values, tap ANT to switch between >CA and CT. However, it seems you can't adjust the two caps >independently; whatever value is dialed in for CA is duplicated for >CT, and vice versa. Is this a bug? > >73, >Drew >AF2Z > > >On Sat, 19 Jul 2008 08:16:37 -0400, AF2Z wrote: > >>You can set the KAT3 menu config entry to LCSet. Exit the menu then >>tap ATU TUNE. You can set the L and C values individually with the A >>and B VFO controls. But it doesn't seem to make any difference in the >>AM received signal as far as I can tell. I'm using a 100' wire for an >>antenna. >> >>73, >>Drew >>AF2Z >> >> > ___ 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
Re: [Elecraft] BCB sensitivity [K3]
Ok, my final conclusion (i promise) Manually adjusting the L and C values of the ATU DOES have an effect on BCB reception (had my RF gain turned down before, so seemed like there was no difference). Maximum L (17.35 pH) gives maximum received signal strength on a short antenna, as expected. However, you can't adjust CA and CT independently. And checking all of my pretuned bands the values for CA and CT on any given band are equivalent (which seems odd). Furthermore, merely selecting between CA and CT with the ANT button while in LCSet mode has an effect on the received signal-- a couple of s-units difference between the two is what I noticed. (But I don't think it is the antenna relay being switched, as mentioned before.) What I want to know is, are the displayed values for CA and CT correct, and can they be adjusted independently of each other? BTW, I am using F/W ver 2.13. Thanks, 73, Drew AF2Z On Sat, 19 Jul 2008 08:43:44 -0400, AF2Z wrote: >Ok..., it seems the ANT switch, which is supposed to be switching >between CA and CT while in the LCSet mode, is actually switching >antennas as it would do in normal operation. I guess this is a bug, >unless I'm doing something wrong here... > >73, >Drew >AF2Z > > ___ 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
Re: [Elecraft] BCB sensitivity [K3]
[EMAIL PROTECTED] wrote: Manually adjusting the L and C values of the ATU DOES have an effect on BCB reception (had my RF gain turned down before, so seemed like there was no difference). Maximum L (17.35 pH) gives maximum received signal strength on a short antenna, as expected. However, you can't adjust CA and CT independently. And checking all of my pretuned bands the values for CA and CT on any given band are equivalent (which seems odd). Furthermore, merely selecting between CA and CT with the ANT button while in LCSet mode has an effect on the received signal-- a couple of s-units difference between the two is what I noticed. (But I don't think it is the antenna relay being switched, as mentioned before.) What I want to know is, are the displayed values for CA and CT correct, and can they be adjusted independently of each other? I believe this is a bug which I reported. If I remember properly, the problem is that the values are not being displayed correctly. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ 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
