Re: [Elecraft] Combo pre-amp

[Joe Subich, W4TV]

I don't know about that ... the incremental cost for the KXV3A
vs. KXV3 was minimal.  The firmware changes to support two more
control lines should be minimal.

As far as an internal preamp - it should not be significantly more
complex than the PR6.  With switching on a "KVX3B", an internal
preamp would not need the bypass relays so they could be used for
band switching if needed.  However, if the user did not want a
10/12 preamp, it would not be a stretch to use the existing PR6
internally for six meters only.

One would think it relatively straightforward to switch two input
tuning/matching networks in a PR6 style preamp or an alternate,
broadband design could be used to completely avoid the need for
band switching.   With a little care in the design and programming,
a higher gain/lower nf preamp could be substituted (electronically)
for the standard preamp or the controls could be arranged to cycle
through "none"/"norm"/"opt".

73,

   ... Joe, W4TV


On 5/25/2013 10:48 PM, Gary Gregory wrote:

Ah Joe,

Thankyou for resurrecting my thought that it IS possible. The issue will
most likely be a lack of quantity that would be sold versus the cost to
manufacture,

I will live in hope...:-)

thanks for the info Joe, much appreciated.

73

Gary

On 26 May 2013 12:45, Joe Subich, W4TV <li...@subich.com> wrote:

let's not let that technical inconvenience reduce in any
way my hope for a cure to my sometimes demented desires....:-)

I'm not saying it isn't possible ... takes one additional relay
and two connectors.  There are even couple unused control lines
on the KXV3A that could be used to control the added relay and
switch bands (10/12 and 6 M) if necessary.

73,

    ... Joe, W4TV


On 5/25/2013 10:13 PM, Gary Gregory wrote:

Hi Joe,

Gee...Shhhhh....let's not let that technical inconvenience reduce in any
way my hope for a cure to my sometimes demented desires....:-)

Of course you are quite correct Joe. Point taken mate.

73

Gary

On 26 May 2013 12:06, Joe Subich, W4TV <li...@subich.com> wrote:

   So, I will continue to want an internal pre-amp and it does not need

to be for 6M as I don't operate there either. This is MY choice and
does not  hold sway with the masses but it is my choice after all.

I agree that an internal preamp (or premps) would be ideal.  However,
in addition to the preamp(s) Elecraft would need to provide *another*
design for the KXV3A - one that switches the RX ANT IN/OUT connections
to internal jacks - as neither the original KXV3 or current KXV3A have
that capability.

73,

     ... Joe, W4TV


On 5/25/2013 9:24 PM, Gary Gregory wrote:

  I don't wish to flog a dead horse any further, however, choice is

something
it seems everyone on this list is after.

So what if a K3 needs to NOT have a 2M transverter to fit a combo
pre-amp?....there are many K3's in the world not fitted with 2M. This
is a
choice made by the original owner I guess which is what it is, a
choice. I
fully appreciate everyone's point of view, but I would hazard a guess I
am
not alone in wanting an internal unit as a CHOICE, not at the expense of
taking away other folks right to choose.

Wayne has stated Elecraft's case and that is there is not enough room
but
his statement is qualified by the mention of the 2M option which is a
customer choice right?

So, I will continue to want an internal pre-amp and it does not need to
be
for 6M as I don't operate there either. This is MY choice and does not
hold
sway with the masses but it is my choice after all.

You mention remote install, fine, but again it is still another cable
and
still yet another box to cart around. Setup on a table (standard picnic
size) the depth of the table means you need to have the K-Line right on
the
rear edge and the 6M pre-amp protrudes far enough back that if you are
up
against a barrier of some sort, the cables push the K-Line forward and
reduce the work space area such that little room is left to operate in a
comfortable manner.

I could pontificate forever on the drawbacks when operating portable
but I
am probably not a member of the right choir.

Maybe an OEM will come up with a 'plug-in' internal 10M pre-amp designed
for a K3.....now that would solve everything for me and I wouldn't have
to
plead my case....:-)

It's all about choice folks!

73

Gary

On 26 May 2013 10:32, Walter Underwood <wun...@wunderwood.org> wrote:

   The original poster mentioned "those of us who operate portable".
Running

cables to the next room does not make that any simpler.

wunder
K6WRU

On May 25, 2013, at 5:13 PM, Dr. William J. Schmidt, II wrote:

   This sounds like a lack of creative thinking.  How about using two 90

  degree

  BNC elbows on the back of the radio and a couple of BNC jumpers.  You

can
put the preamp anywhere... even in the next room is that is your
fancy.
Also, you might try one of the 50+ preamps that are already available
by

  a

  variety of companies with ultra-low noise figures.  I'm not sure I

need
a
preamp to take up the space of my existing 2 meter module.


Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ

Owner - Operator
Big Signal Ranch
Staunton, Illinois

email:  b...@wjschmidt.com

-----Original Message-----
From: elecraft-boun...@mailman.qth.****net<elecraft-bounces@mailman.*
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On Behalf Of Jeff Cochrane
Sent: Saturday, May 25, 2013 7:03 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Combo pre-amp

Agreed Gary,
I too would be interested in an internal 10M pre-amp (or an internal

  combo

  6-10M pre-amp).

I already have the PR6 but like you say it (in stock form) protrudes
so

  far

  out behind the rig that it almost impossible to use for portable work.

Mounting it internally is the way to go and I reckon a combo pre-amp

  would

  sit nicely where the internal 2M transverter normally goes.

Jeff Cochrane - VK4XA



Gary Gregory-2 wrote

  Well I do hope there will be a version for 10M perhaps that will

install
within the K3. Much as it would be nice to have I am not going to buy

  more

  boxes needing to be plugged in, cabled or whatever.

Whilst I understand some folks have space available and can wire in
as
many
boxes as are available, those of us who operate portable tire very

  quickly

  of sorting cables, boxes and the resultant tangled leads.

I guess I will have to wait and see what is produced but another

  external

  box such as the 6M pre-amp which protrudes too far and can easily be

knocked around is a non starter for me no matter that I could use it,
it
is
what it is, a box too far.

Gary

--
*Gary - VK1ZZ
Skype: Gary.VK1ZZ
Motorhome Portable
The Shack*
*Elecraft K3
P3 Panadapter
KPA500FT
KAT500FT**
KX3-K
*
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