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:
[email protected] 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 <[email protected]>:
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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