K1 filter board question

[Craig Rairdin]

I bought both a 4-band and 2-band filter board for my K1. I built the 4-band
board for 40, 30, 20, and 15 meters.

I have parts to make the 2-band board either 80/17 or 80/15. I've also
considered the 160/80 option. That's not what's bothering me. Here's the
question:

What's really going to be involved when swapping boards? Beyond the physical
removal of one board and installation of the other, there are menu changes
to make to identify what bands are installed. What about calibration? In the
documentation for the 2-band board it indicates the K1 can remember settings
for 4 bands so it's not necessary to re-calibrate every time you swap
boards. They must be thinking I'm swapping two 2-band boards because 4+2 is
six bands to remember.

Anybody else using this configuration and can tell me what all I'll have to
do every time I switch boards?

My other alternative is just to forget the 2-band board and move on to
building K2 #4941 which is sitting in its box ready to be built. I just feel
like I should finish all the K1 options before moving on to the K2 otherwise
the K1 will never get done.

Craig
NZ0R
K1 #1966
K2 #4941

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[Mike Morrow-3]

Craig wrote:


>I bought both a 4-band and 2-band filter board for my K1. I built
> the 4-band board for 40, 30, 20, and 15 meters.

>I have parts to make the 2-band board either 80/17 or 80/15.

>What's really going to be involved when swapping boards? ...
>What about calibration?

The K1 MPU stores a display calibration factor for each HF (160m through
10m) band, not each filter board band.  When you calibrated your
40/30/20/15m board, the K1 stored the results for 40/30/20/15m.  If you
build a two band filter board for 80/17m and calibrate the display, then the
K1 will store the results for 80/17m.

After you swap in a two-band filter board, you must tell the K1 MPU which HF
band is assigned to K1 bands b1 and b2.  When you return to a four band
board, you must re-assign b1 and b2 to the appropriate HF band.  The K1
automatically uses the appropriate stored display calibration factor for the
HF band assigned to each K1 filter board band.

EXAMPLE:

If you remove your 40/30/20/15m board and install a 80/17m board, the K1
automatically detects that a two-band board in now in place.  Then you use
the menu to re-assign b1 to 80m and b2 to 17m.  The K1 automatically applies
the previously stored display calibration factors for 80m or 17m.

If you remove your 80/17m board and install a 40/30/20/15m board, the K1
automatically detects that a four-band board in now in place.  Then you use
the menu to re-assign b1 to 40 and b2 to 30m.  You won't have to change
anything for b3 and b4, since the K1 will remember that they had been
assigned to 20/15m when you first set up your four band board.

>They must be thinking I'm swapping two 2-band boards because
>4+2 is six bands to remember.

Just remember, the display calibration factor is stored in the K1 front
panel MPU for each HF band.  It doesn't matter how many bands your filter
board has, because once you tell the K1 MPU which HF band goes with each
filter board band, the appropriate display calibration factor for the HF
band will be used.

>Anybody else using this configuration

I use a 40/30/20/15m board and a 80/17m board.  I don't often swap boards,
but it's a nice feature to have anyway.

> and can tell me what all I'll have to do every time I switch boards?

Only two basic steps, anytime after you've initially calibrated and aligned
each board:

(1)  Physically swap boards.
(2)  Re-assign HF bands for b1 and b2.

That's it, no matter if it's a two-band or a four-band board swap!

NOTE:  You mentioned that you were considering building the two-band board
for 80/15m.  Your four band board already has 15m, and you have already
stored the display calibration factor for 15m in th K1.  The K1 can store
only one display calibration factor for each HF band.  If you install
another filter band board that also has 15m on it, when you assign b2 to 15m
the K1 will use the calibration factor that was based on the hetrodyne
crystal for 15m that was on your other filter board.  Unless the 15m
hetrodyne crystals on the two filter boards oscillate within about 100 Hz of
the same frequency, then the display will be somewhat inaccurate on the
second filter board that has 15m on it.  There's no way of getting around
this.  It's best to not duplicate the same HF band on multiple filter
boards.

73,
Mike / KK5F

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[Sandy W5TVW]

I have two boards for my K1: the usual 4 band setup for 40/30/20/15 meters,
and a 2 band board setup for 160/80 meters.
When changing from the 4 band to 2 band board, besides the physical replacement of the
RF board and replacement "piggyback" of the KAT1 board (if you have that installed)
Is as follows.
Tap BAND until 7.0 is displayed
Tap MENU and toggle WPM buttons until B1 is displayed.
Hold EDIT and 7.0 is displayed.  Toggle WPM again until 1.8 is displayed.
Tap MENU and tap BAND until B2 is displayed, hold EDIT and now 10.1
is displayed.  Toggle WPM until 3.5 is displayed.
Tap MENU and now you have band 1 set at 160 meters and band 2 set at 80
meters.
Now do the offset calibration procedure for 160 and 80 meters.  Then operate
radio on those two bands as you normally would.
The chip in the K1 will remember these offset/calibration assignments
for each band that is calibrated.  So when you change back to the 4 band card
all that is necessary is to reassign band 1 to 7.0 and band 2 to 10.1 and you
are back to you old 4 band offsets.
REMEMBER that you cannot assign say a offset for one band to two different
boards!  In other words, you can't have say an 80/40 meter board and
a 40/30/20/15 meter board!  Also once you do the calibration procedure
you don't have to repeat it unless you have say two 2 band boards setup
for say: 80/40 and 40/20 meters.  If this is the case 40 meters has to be
calibrated EACH time the boards are changed as the offsets of the two
40 meter band crystals will be different.  Hope this is clear!
160 meters is NOT a standard Elecraft board, but they have ALL the parts
necessary to build say a 160/80 meter board EXCEPT the band crystal for 160 meters.
The conversion is fairly simple and works without a hitch to any 2 band board
package.  80 and 17 meters is a "standard" item so this can be ordered if you
desire 80/17 instead of 160/80.
Ultimately, I'd like to build another 2 band board for say 17 and 10 meters.
This would be fun during 10 meter openings, no doubt "coming" in the future
soon.
Hope this hasn't discouraged you.  Also I hope the "changeover" above
was clear.
73,
Sandy W5TVW

----- Original Message -----
From: "Craig Rairdin" <[hidden email]>
To: "'Elecraft Mail'" <[hidden email]>
Sent: Thursday, June 02, 2005 7:59 AM
Subject: [Elecraft] K1 filter board question


| I bought both a 4-band and 2-band filter board for my K1. I built the 4-band
| board for 40, 30, 20, and 15 meters.
|
| I have parts to make the 2-band board either 80/17 or 80/15. I've also
| considered the 160/80 option. That's not what's bothering me. Here's the
| question:
|
| What's really going to be involved when swapping boards? Beyond the physical
| removal of one board and installation of the other, there are menu changes
| to make to identify what bands are installed. What about calibration? In the
| documentation for the 2-band board it indicates the K1 can remember settings
| for 4 bands so it's not necessary to re-calibrate every time you swap
| boards. They must be thinking I'm swapping two 2-band boards because 4+2 is
| six bands to remember.
|
| Anybody else using this configuration and can tell me what all I'll have to
| do every time I switch boards?
|
| My other alternative is just to forget the 2-band board and move on to
| building K2 #4941 which is sitting in its box ready to be built. I just feel
| like I should finish all the K1 options before moving on to the K2 otherwise
| the K1 will never get done.
|
| Craig
| NZ0R
| K1 #1966
| K2 #4941
|
| _______________________________________________
| Elecraft mailing list
| Post to: [hidden email]
| 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 mailing list
Post to: [hidden email]
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