Second RX

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Second RX

Mike Harris-9
Hi,

Had the chance to play with a Yaesu MP1000-M Mk.V (apologies for swearing)
today and was most impressed with the functionality that the second RX
path gives when working split.  Never experienced that before.  Other than
that a bit OTT for me.

Wouldn't it be nice to have a second RX module, rather like the external
VFO of old, slaved to the main K2 chassis.  Or maybe an interface module
that enables another RX to be coupled to the K2 for common antenna feed,
switching and muting.

Something else I thought about was boots for the KX1.  20W or so would
make it handy as a slightly more potent, holiday, restricted bands, mini
rig.  It would still be a pretty compact combo.

Regards,

Mike VP8NO

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Re: Second RX

Alexandra Carter
Just get a 2nd K2!

By "boots" I suspect you mean an amp, they're out there, the HFpack
group has an amp in the works, I think you can buy the kit, and there
are other kits out there. Our FCC in the US is very uneasy about
anything that could be conceivably be used on CB, so HF QRP amps are
not as common on the US market as they could be.

73 de Alex NS6Y

On Apr 21, 2006, at 2:25 PM, Mike Harris wrote:

> Hi,
>
> Had the chance to play with a Yaesu MP1000-M Mk.V (apologies for
> swearing)
> today and was most impressed with the functionality that the second RX
> path gives when working split.  Never experienced that before.  Other
> than
> that a bit OTT for me.
>
> Wouldn't it be nice to have a second RX module, rather like the
> external
> VFO of old, slaved to the main K2 chassis.  Or maybe an interface
> module
> that enables another RX to be coupled to the K2 for common antenna
> feed,
> switching and muting.
>
> Something else I thought about was boots for the KX1.  20W or so would
> make it handy as a slightly more potent, holiday, restricted bands,
> mini
> rig.  It would still be a pretty compact combo.
>
> Regards,
>
> Mike VP8NO

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RE: Second RX

Ron D'Eau Claire-2
In reply to this post by Mike Harris-9

Had the chance to play with a Yaesu MP1000-M Mk.V (apologies for swearing)
today and was most impressed with the functionality that the second RX
path gives when working split.  Never experienced that before.  Other than
that a bit OTT for me.

Wouldn't it be nice to have a second RX module, rather like the external
VFO of old, slaved to the main K2 chassis.  Or maybe an interface module
that enables another RX to be coupled to the K2 for common antenna feed,
switching and muting.

Something else I thought about was boots for the KX1.  20W or so would
make it handy as a slightly more potent, holiday, restricted bands, mini
rig.  It would still be a pretty compact combo.

Regards,

Mike VP8NO
---------------------------

I'll bite! What does the MP1000 provide in split that the K2 doesn't provide
in split mode? I run my K2 in split all the time so I can adjust the
receiver as desired without messing with RIT and that tiny little knob.

If you have access to old QSTs, Doug DeMaw's "Boots for the HW-8" in the
June '79 issue would be a perfect match for the KX1. I built one for my HW-8
using plug-in output filter modules to work 40/30/20 meters. Takes about 1
to 2 watts input and puts out 15 watts. Simple one-transistor design.

I don't use mine with my KX1 (well, there's a K2/100 sitting on the
operating desk...). I gave it to a buddy who wanted a little more oomph for
his HW-8.

Ron AC7AC

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Re: Second RX

Geoffrey Mackenzie-Kennedy-2
In reply to this post by Mike Harris-9
Mike VP8NO wrote on Friday, April 21, 2006 10:25 PM

 > Wouldn't it be nice to have a second RX module, rather like the external
> VFO of old, slaved to the main K2 chassis.

------------------------------------------------------------------------------------

Especially if the K2's 'main' and second receivers could be tuned to
different bands at the same time for crossband split operation.

73,
Geoff
GM4ESD



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RE: Second RX

Jukka Tarvainen
In reply to this post by Ron D'Eau Claire-2
> I'll bite! What does the MP1000 provide in split that the K2
> doesn't provide
> in split mode?

Ability to hear DX and pileup simultaneously. That is very good for chasing
window where stations are getting through and you don't miss any chance to
call. With holding "REV" and tuning split TX freq you often miss the point
when DX gives "TU" and starts to listen for next one. I have been thinking
about second K2 to do this. Any experience? How to mute receiving K2 when
transmitting other? That would also permit Single Op Two Radio SO2R
operation in contests.

73 Jukka OH4MFA
K2/100 #4293

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RE: Second RX

Dave, G4AON
In reply to this post by Mike Harris-9
Hi Guys

Been there, done that... My "boat anchor external receiver" project will
do that... Even with a receiver that's not a boat anchor. As I tap into
the K2's receiver after the low pass TX filter (on J13), listening on
other bands than the K2 is tuned to, is a bit variable and non existent
in some cases. The cost is very low, it's an easy weekend project and
doesn't involve any modifications to the K2 other than fitting a socket
at J13. Options for opto-isolator or relay switching.

http://www.astromag.co.uk/k2/K2externalRX.pdf

73 Dave, G4AON

>Ability to hear DX and pileup simultaneously. That is very good for chasing
>window where stations are getting through and you don't miss any chance to
>call. With holding "REV" and tuning split TX freq you often miss the point
>when DX gives "TU" and starts to listen for next one. I have been thinking
>about second K2 to do this. Any experience? How to mute receiving K2 when
>transmitting other? That would also permit Single Op Two Radio SO2R
>operation in contests.
>
>73 Jukka OH4MFA


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RE: Second RX

Chris Kantarjiev K6DBG
In reply to this post by Mike Harris-9
> Something else I thought about was boots for the KX1.  20W or so would
> make it handy as a slightly more potent, holiday, restricted bands, mini
> rig.  It would still be a pretty compact combo.

I bought Virgil K5OOR's HFpacker amp - 35W out. Haven't built it up yet,
but I bought it exactly with this in mind - something small but adequately
powerful to take with my KX-1.

Unfortunately, 35W is enough that the tuner becomes an issue: that's
more than the T1 is rated, and most everything else jumps to 100W
capacity and becomes much larger. Maybe the Z11?

73 de chris K6DBG
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