New Elecraft Products

[Geoffrey Mackenzie-Kennedy-2]

Vic Rosenthal wrote:

> What would this sound like?  I've always wanted to try some kind of
> crossover device that would distribute the signal between the two
> earphones according to frequency.  Then as I tune through a CW signal, it
> would seem to move.  Is this the same idea?

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

Several ways to skin this cat Vic, but yes the signal seems to move. Bit
like being in a room at a party with people, or you, moving around as you
tune. When you stop tuning everybody stops moving, some on one side of you
others on the other side. It is possible to sort out those in front and
those behind - the almost zero beat guys- but this is best done in other
circuitry. Combine this with the brain's ability to zero in on a particular
conversation (The 'cocktail party effect') and life will never be the same.

73,
Geoff
GM4ESD

PS Strong receiver design information is almost ready for you.



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[VR2BrettGraham]

Sometime last night K2TA posted what I was thinking:

>As long as we are dreaming...I wish the KPA800 photo had a K2 or some other
>way of determining the size/dimentions.
>
>If the KPA800/1500 is not much larger than a Ten-Tec Orion then I would love
>to see a K3 that matched the amp in size.
>
>Make it modular and expandable.  Have slots on the motherboard for 2nd rcvr,
>6M/2M/220/440 transverter modules etc.

I don't think doing an internalized set of XVs makes sense,
but the basic approach is neat (though as K2VCO pointed
out, perhaps a bit on the large side).

Hopefully more of a kit than the new KPAs, it might be
reasonable to expect doing one or two significant
additional features to the basic radio in a post-K2 product.

Take general coverage.  BPFs as a module gives choice of
not having to pay for cost of feature one might not need, or
change to something even more robust for more demanding
ham-band-only use.  Enough room in that cabinet to
transplant some of those FT9k preselectors?  ;^)

A sub-RX isn't entirely a rabid contester feature - I use it
more DXing & realize if we had it in the past, it would have
been handy when NCSing 7RN.  Perfect thing to make into
a module.

All sorts of interesting possibilities.  Hopefully starting with a
good, solid radio.  Keeping kit & serviceability in mind, maybe
unlikely to have things like IF DSP.  More remote
controllability please, though remember every knob on an
encoder is significantly more expensive.

Something more like as N8LP described.  Some of the
features mentioned here are probably not practical.  I see
some of it driven by Brand-K/I/Y domestic market, something
Elecraft probably now has the momentum to go against.

An SO2R-ready-out-of-the-box K3 is the last thing this
contester would like to see.... a modernized TR7 as Larry
mentioned or something starting from like an OMNI6-as-
a-kit - that would go down well with a far wider market, too.

N2TK - I'm thinking all solid-state TS820/830-like performance
in a kit, maybe even use an IF so that filters can be recycled
from other rigs.  Are you with me? Divide-from-VHF PLL is start
towards Tony's & W4ZV's previous mention of close-in
performance - GM4ESD, got any other ideas?  Then add some
first-string big-box features based on modules & there's
something for everybody.

Nice to dream, isn't it?  ;^)

73, VR2BrettGraham

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[Bill Coleman-2]

On May 24, 2006, at 11:39 AM, N2TK, Tony wrote:

> - Fast, quiet QSK
> - Dual receive - The ability to listen in stereo so when running  
> split you
> can listen in one ear on the transmit freq and at the same time  
> listen in
> the other ear to the receive frequency.

I want more. I want SO2R in a box -- I want to be able to receive  
with one receiver when I'm transmitting (so long as it isn't on the  
same band).

> - 6-160M - maybe even 2M?
> - Push button "clear" switch for RIT and XIT.

Lack of this feature automatically DQs the K2 from some very serious  
contesters.

> - Better close in (2KHZ) dynamic range performance.

For the price, the K2 has one of the best dynamic range figures, even  
close in.

> - Switchable front end filters

Huh? The K2 is single-conversion. It isn't an up-conversion rig like  
the Orion or the IC-7800, etc. There's no need for a front-end  
roofing filter because the main filter IS the front-end roofing filter.


Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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[Bill W4ZV]

N2TK:
- Better close in (2KHZ) dynamic range performance.

AA4LR:
For the price, the K2 has one of the best dynamic range figures, even close in.

         K2's IMD degrades 24 dB from 5 kHz to 1 kHz,
primarily due to phase noise.

IMD @ 5 kHz             91 dB (ARRL)
IMD @ 2 kHz     80 dB* (Sherwood)
IMD @ 1 kHz     67 dB* (ARRL)

* = phase noise limited

Sources:
<http://www2.arrl.org/members-only/prodrev/pdf/lab/k2.pdf>http://www2.arrl.org/members-only/prodrev/pdf/lab/k2.pdf 
(graph page 20)
<http://www.sherweng.com/table.html>http://www.sherweng.com/table.html



N2TK:
- Switchable front end filters

AA4LR:
Huh? The K2 is single-conversion. It isn't an up-conversion rig like
the Orion or the IC-7800, etc. There's no need for a front-end
roofing filter because the main filter IS the front-end roofing filter.

         But Orion is not an up-conversion rig.  Its
First IF is 9 MHz vs the K2's ~5 MHz.  Up conversion
rigs typically have First IF at VHF (70 or 40 MHz).

"Until the Orion came out, 99% of modern transceivers were up
conversion radios. (K2 the exception)"  Rob Sherwood

http://www.sherweng.com/Dayton_2004/Dayton_2004-Sherwood.pdf

                                 73,  Bill  W4ZV


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[N2EY]

In a message dated 5/25/06 10:19:22 PM Eastern Daylight Time,
[hidden email] writes:


> "Until the Orion came out, 99% of modern transceivers were up
> conversion radios. (K2 the exception)"  Rob Sherwood
>
> http://www.sherweng.com/Dayton_2004/Dayton_2004-Sherwood.pdf
>

A bit of hyperbole, that.

The Ten Tec Omni series, from the A to the VI+, are/were not upconverting -
their first IF is/was 9 MHz. Same for the original Argosy and the Corsair I and
II. The Delta used a 6.3 MHz first IF. In fact, upconversion to VHF is rarely
used in TT rigs (the Paragon is one exception).

73 de Jim, N2EY
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[N2EY]

In a message dated 5/24/06 9:38:47 AM Eastern Daylight Time,
[hidden email] writes:


> The next logical step in terms of performance is a
> contest grade K3 with SO2R capability to match the new amps. The major
> problem with this is that is not compatible with a kit... IMHO. I just
> don't see the big gun contesters spending months building a radio with
> that kind of performance.

I see your point, but consider this:

When the K2 came out, one of the comments I heard many times was that there
weren't many hams who would spend close to $600 for a kit QRP CW rig they had
to build themselves. Almost 6000 K2s later, that's turned out to be a bit
inaccurate....

Another comment I recall went along the lines that the complexity of modern
radio technology was such that any modern, high performance ham rig would have
to use surface mount technology and would be close to impossible to put in a
kit....

You can see where this is going.

I don't know if big gun contesters would buy/build a "K3", or if SO2R in one
rig is even a practical option. I do know that some serious contest folks are
running K2/100s, even in SO2R. I also know that the K2 has shown there to be a
market for rigs that don't fit the Ikensu mold.

73 de Jim, N2EY

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