[Elecraft] K1...

[Don Wilhelm]

Brett,

The K1 4 band board has only 2 low pass filters, so for possible band 
pair combinations, the higher band must be lower than the 2nd harmonic 
of the lower band.

That fact rules out an 80/40 meter combination.  80/60 may be possible, 
but the K1 does not do SSB, so that is not a good choice.  You are left 
with 40/30 for the lower band pair, and 20/(17 or 15) for the upper band 
pair.

If you must have 80 meters with the 4 band board, that may be possible 
with a modified board, but it would then be a 3 band board - 80 and 
40/30 would be possible or 80 and 20/(17 or 15) would be a possibility.

The better solution is to purchase a 2 band board - if the 4 band board 
is for 40/30 and 20/15, then a 2 band board for 80 and 17 meters would 
allow coverage of all bands 80 thru 15.

A properly operating K2 does not have the problems you suggest - the 
tuning 'pops' are the result of an open RFC15, and it covers all bands.  
The K2 receiver is more sensitive than the K1, so you may want to 
reconsider your choice.

The K1 tuning range is builder selectable.  Capacitors are provided for 
an 80+ kHz range or a 150+ kHz range - take your pick.  the tuning range 
is covered by a 10 turn pot, so the 80 kHz range gives you about 8 kHz 
per turn while the 150 kHz range provides about 15 kHz per turn of 
bandspread.  Some users say the 150 kHz range is too 'touchy', while 
others have no problem with it.  Of course, you may use intermediate 
capacitor values to change the range to anything that you prefer.

You mentioned computer control - the K2 can be computer controlled with 
the addition of the KIO2 option, but I do not know of any computer 
control possibilities for the K1.

73,
Don W3FPR


Brett Gazdzinski wrote:
> While waiting for the bugs to be worked out of the K3, I ordered
> a K1 for 80 and 40 meters. The 80 meter parts are backordered
> for a week or so, but I have some questions about the rig.
>
> Is it not possable to get a 4 band one with 80,40,20,and 15
> meters on it?
> If not, what is the reason?
>
> My main reason for getting the K1 is so I can use it in the den to rx
> some cw for practice, without running off to the ham
> shack and ignoring my wife.
> She can watch TV while I copy code with walkman
> style headphones.
>
> I read all the reviews, and they are very good.
> If I make the tuning range 100kc, will the tuning rate
> be too fast?
> The K1 seems very analog (with computer control), and 
> I wonder if it works better in some respects then the K2?
>
> I would guess the K1 is free from the odd noise the K2
> made at times when tuning, and frequency shifts between filter settings,
> and maybe the vfo is cleaner then DDS stuff?
>
> Brett
> N2DTS
>
>