[Elecraft] [K1] Building a 60m band module for the K1

Fri Apr 28 10:51:19 EDT 2017

Don,

so the basics are fine for now and understood so far.

Now the noodling will start. As antenna season is coming up it feels like a start of a new Elmer project with the K1. Collecting knowledge and parts during the summer and start in the fall.

For the filter design I will use one of these two programs:

1. Elsie http://tonnesoftware.com/index.html
or
2. Free filter design software by "Almost All Digital Electronics“ http://w1hue.org/filter.html

Do you have any advise for me which one to use best?
Thanks for all!

72/73 de 
sTef

DM5TU / VY1QRP
DL-QRP-AG *GM*
GQRP #8769

Am 28.04.2017 um 15:20 schrieb Don Wilhelm [via Elecraft] <ml+s365791n7630070h11 at n2.nabble.com>:

Stef, 

You want the crystal frequency 8MHz greater than the *lowest* frequency 
you want to tune.  If you want to put the band segment in the center of 
your K1 80kHz tuning range, your tuning would extend at 5.344kHz to 
5.424kHz, so you would order a crystal at 13.344kHz. 
I believe the mixing scheme for the Sierra is about the same as the K1, 
but I don't know the VFO frequency low and high for the Sierra. 

I would order the 80/40 meter 2 band board - plus the 5 capacitors from 
the 30 meter RF bandpass filter 
(2 - 1800pF, 2 - 270pF, 1 - 4.7pF).  That way you can have a 2 band 
board for 80 and 60 meters as well as the 4 band board. 
You will also need some capacitors to tune the 40m RF bandpass filters 
down to 60 meters - as I indicated, you will have to experiment to find 
the right values. 

The firmware for the K1 does not recognize the 60 meter band, but it 
does remember the CAL OPF offset for up to 6 bands.  4 are used for you 
4 band board (do not duplicate any of those bands), so you could set the 
menu b1 for the 2 band board to 80 meters and the b2 to 17 meters.  I 
know the leading digits of the display would not be correct, but you can 
at least make the final 3 digits correct. 

73, 
Don W3FPR 

On 4/28/2017 8:16 AM, DM5TU - sTef wrote:

> Don, 
> 
> thanks a lot for your helpful advise. 
> 
> So the smartest way to begin would be to order a KFL1-2 with the 30/40m option. Or should I go for 80/40? 
> I have the 4 band module built in now with 40/30/20/15. 
> 
> The crystal will be custom ordered at www.krystaly.cz  Email: [hidden email] <x-msg://46/user/SendEmail.jtp?type=node&node=7630070&i=0>   KRYSTALY Hradec Kralove,a.s Ceska Republika. 
> They make perfect quality for a very good pricing. 
> 
> Taking in account that my K1 VFO is 80 KHz wide and the allowed spectrum for 60m in DL  is 15KHz ( 5.351.5 - 5.366.5 MHz in DL) I could split the left over 65 KHz into 2 parts and add these to the lowest and the highest frequency. 
> 
> 5.351.5 - 32,5 KHZ = 5.319 KHz  -> This would be the lowest QRG. Adding 8 MHz on top we end up with 13.319 MHz. 
> 
> Do you think these specs here are fine for ordering the rock? 
> 
> Frequency:         13.319 MHz 
> Package:            HC-49, series resonance 
> Adjustment:        +/-5 ppm 
> Stability:             +/-10 ppm over OTR (-20/+70C) 
> 
> Well I just ordered some 13.300 MHz crystals for my NorCal SIERRA which I moved to that band. So I can use these ones too. 
> 
> 
> Don, please let me know your thoughts? 
> What about the firmware of the K1 , band recognition etc? 
> 
> 
> 72/73 de 
> sTef 
> 
> DM5TU / VY1QRP 
> DL-QRP-AG *GM* 
> GQRP #8769 
> 
> 
> So if I am looking at a crystal with ( 
> Am 28.04.2017 um 13:56 schrieb Don Wilhelm <[hidden email] <x-msg://46/user/SendEmail.jtp?type=node&node=7630070&i=1>>: 
> 
> Stef, 
> 
> I have not done it, but I can explain how to do it. 
> Start with a crystal that is 8MHz above the lowest frequency you wish to tune. 
> Then tune the premixer bandpass filter to 3100kHz lower than your crystal frequency - I would start with the capacitor values from the RF bandpass filter for 30 meters. 
> 
> You may have to experiment with the capacitors for the 60 meter RF Bandpass Filter.  If you have the 40 meter bandpass filter capacitors, you can add padder capacitors to them to bring the frequency down, or use filter design software to figure out what the capacitors should be. 
> 
> 73, 
> Don W3FPR 
> 
> On 4/28/2017 7:33 AM, DM5TU / VY1QRP - sTef wrote: 
>> Dear Gang, 
>> did anybody of you ever managed to bring the K1 succesfully to 60m? 
>> As the band (15KHz from 5.351.5 - 5.366.5 MHz) is now legal in Germany I am 
>> in the need of a 60m rig. 
>> So please let your thoughts roll out to the group. 
>> Thanks for your help. 
>> 72/73 de 
>> sTef 
>> DM5TU / VY1QRP 
>> DL-QRP-AG *GM* 
>> GQRP #8769 
>> -- 
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