K3 - Choice of filters in KRX3

[GW0ETF]

When I bought the 2nd receiver after it first came out I matched the main rx with an 8-pole 250 Hz roofing filter. After several years now of SO2V contesting and dx pile-ups I've never had the 2nd receiver wound down anywhere near the point where this filter would be switched in. So I'm wondering whether to liquidate this particular valuable little asset and invest in something more useful...such as antenna hardware.

Before I do perhaps others could say how they think the 2nd rx should be populated filter-wise, which presumably will vary with operating mode. I don't tend to do the 'second op with separate headphones tuning the 2nd vfo' scenario which is I assume where a full filter complement would be useful.....

Be interested in any opinions.....73,

Stewart, GW0ETF

[Jon Kåre Hellan]

On 10/26/2011 01:10 PM, GW0ETF wrote:

> When I bought the 2nd receiver after it first came out I matched the main rx
> with an 8-pole 250 Hz roofing filter. After several years now of SO2V
> contesting and dx pile-ups I've never had the 2nd receiver wound down
> anywhere near the point where this filter would be switched in. So I'm
> wondering whether to liquidate this particular valuable little asset and
> invest in something more useful...such as antenna hardware.
>
> Before I do perhaps others could say how they think the 2nd rx should be
> populated filter-wise, which presumably will vary with operating mode. I
> don't tend to do the 'second op with separate headphones tuning the 2nd vfo'
> scenario which is I assume where a full filter complement would be
> useful.....
>

When using diversity receive, both receivers should use the same filter.
You enter diversity receive by pressing SUB for a looong time. Manual
says 2s, that's probably right, but it feels longer. The two receivers
have to be connected to different antennas. The details are in the manual.

But *why* isn't the sub-receiver antenna input grounded when the K3 is
transmitting? On most bands, if I try diversity, the relay protecting
the sub input starts clicking, and that means I should turn it off.

73

Jon LA4RT

> Be interested in any opinions.....73,
>
> Stewart, GW0ETF
>
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[GW0ETF]

Ah yes, I'd forgotten all about diversity. Having said that I don't have antennas for diversity here but going /P at a contest qth it could well be *very* useful.

Thanks for the reminder Jon, one good reason to put it out on here.......

73,
Stewart, GW0ETF

Jon K Hellan wrote

When using diversity receive, both receivers should use the same filter.

l

[Nr4c]

On Wed, 26 Oct 2011 04:10:56 -0700 (PDT), GW0ETF wrote:
> When I bought the 2nd receiver after it first came out I matched the
> main rx
> with an 8-pole 250 Hz roofing filter. After several years now of SO2V
> contesting and dx pile-ups I've never had the 2nd receiver wound down
> anywhere near the point where this filter would be switched in. So
> I'm
> wondering whether to liquidate this particular valuable little asset
> and
> invest in something more useful...such as antenna hardware.
My K3 has 6, 2.8, 1.8, 400, and 200 filters in the main rec, and only
the 2.8 and 200 (matched)in the Sub.  I do use the sub dialed down to
200 hz when chasing DX at times.  But the DSP works so well that I
couln't justify the expense of the other filters for the sub.  I'd keep
it.

...bill  nr4c



>

> Before I do perhaps others could say how they think the 2nd rx should
> be
> populated filter-wise, which presumably will vary with operating
> mode. I
> don't tend to do the 'second op with separate headphones tuning the
> 2nd vfo'
> scenario which is I assume where a full filter complement would be
> useful.....
>
> Be interested in any opinions.....73,
>
> Stewart, GW0ETF
>
> --
> View this message in context:
>
> http://elecraft.365791.n2.nabble.com/K3-Choice-of-filters-in-KRX3-tp6932305p6932305.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[Barry N1EU]

I've had good success with 200hz filters in main/sub configured as 300hz and operating mostly at 300hz bandwidth in cw.  I previously also had a pair of 500hz filters installed but I no longer use them.

73, Barry N1EU

[Robby.VY2SS]

Stewart,

I operate mostly in the CW mode and some RTTY. In my second RX I have a 400 hz 8 pole. My main RX has 8 pole 500hz and 250 hz filters not counting the SSB ones. I normaly listen with my width set at 350 and down to  200-250 in a contest. I can see no reason to have the same filters in both recievers even using diversity.
I have never tried SO2V operating but I would be interested in hearing more about it since I seem to have the hardware for it.
If you sell it, buy a P3 with the money.

73,

-Robby
VY2SS

[GW0ETF]

Robby,

I'm almost a 100% cw contester with a single antenna and I find SO2V of limited but worthwhile use when run rate is dropping off. I always use full break-in so when listening to the 2nd rx in the headphones you only hear signals between your sent characters. This chopping makes it impossible to copy callsigns so you have to have pick this up during gaps in sending; you can then drop the call into the VFO B window with the '/' key (N1MM) to see if it's a dupe. If it's not then at a suitable juncture simply press the 'Pause' button to swap VFos and focus, and hit Enter (ESM!) to send your call, work 'em and then 'Pause' to move back to your run frequency (assuming someone hasn't jumped on it while you've been away!).

I normally don't use cluster assistance; if I did SO2V would really be neat as you could simply hotkey VFO B to each spot and work them between running Qs. This is how I understand the use of SO2V so if anyone has diferent/better ideas I'd be interested to hear them.....

73,

Stewart, GW0ETF

Robby.VY2SS wrote

Stewart,

I have never tried SO2V operating but I would be interested in hearing more about it since I seem to have the hardware for it.

[Barry N1EU]

GW0ETF wrote

I normally don't use cluster assistance; if I did SO2V would really be neat as you could simply hotkey VFO B to each spot and work them between running Qs. This is how I understand the use of SO2V so if anyone has diferent/better ideas I'd be interested to hear them.....

Stewart, you've essentially got it right.  The other powerful SO2V technique when operating assisted that I use is to work the bandmap up from bottom of the band in vfoA and down from the top of the band in vfoB, quickly switching back and forth and dropping my call in as stations call qrz.  Very high qso rates are obtainable if there are sufficient spots.

I've got Web pages with recordings on assisted ssb and cw SO2V:
http://n1eu.com/n1mm/so2v.htm
http://n1eu.com/n1mm/cwso2v.htm

73, Barry N1EU