Samir,
I have been using TS850 for driving other TRXV than XV144, but should be the
same. I suggest you visiti
http://tk5ep.free.fr, think you will find all answers... Certainly DO NOT
use your main antenna connector of the TS850 for any TRXV purpose: one
mistake and you will find 100W towards yo
Just measure this:
TX: 28.400, 10W
Spurious found at 27.317 MHz approx 30-40 dB down !. This spur is coming
from (I think) 2 * VCO - 4 * IF (2 * 23.485 - 4 * 4.915)
It depends a lot on the power control setting, if you go above 10W it will
increase a lot and below 10W it will get better, but sti
Hi Ben,
My assumption is that the birdie is due to mixing of the VCO with X-tal
frequencies. At certain a (VCO) frequency it will be such that this mixing
product will produce exactly the IF frequency--> a birdie is born. Of course
will this "certain" VCO frequency correspond with a RF frequency (
Julius, I also strugled with this and made a small Excel file to calculate
at which frequency this birdie will be. File can be found at:
www.pc5m.com\projects\resources\kpa100_xtal.xls
At the top you can input the x-tal freq used in the KPA100 and below it
will calculate the mixing products (up to
Finally my lasting K2 frequency calibration issue is solved !
Although no errors could be found (all data ok) my K2 has been of frequency
for approx. 1 KHz.
Only thing was the PLL reference frequency. The range was ok (10 KHz) but
just a bit low, 12.095 MHz max. After changing the Xtal and red
Hi Don (and also Tom who responded),
Thanks for the detailed information.). Verified setting of C22 with both
methods (parallel freq counter on TP1 and measuring the offset of TP1 and
TP2 with a 10MHz signal). Did the CAL PLL and CAL FIL routines, But...no
good..still unable to calibrate correctly
Hi,
I have for some time (1 year) a well functioning k2. Never bothered to do a
proper frequency.calibration because I used the k2 as IF for VHF. Recently I
tried to do so (according to the w3fpr method), but no luck. I can't get the
dial correct and have a quite big error (2 KHz or so). It see
Hi Koert,
Maybe you could check the circuitry around U2 on the frontpanel board and
see if you get 5V at pin 16. Also you could check if the pushbuttons do
react by measuring the voltages on the pushbuttons towards the U2
(3,4,5,6,11,12,13,14). Voltage is multiplexed by the bank1 and bank0 signal
Peter, Wayne
To add to the discussion of TX spurious signals:
I did perform extensive (spectrum) measurements on the TX spectrum at 28MHz
and found that (despite the class A / High IMD behavior of the TX buffer
Amp) some in band signals are generated in this amplifier.
Example:
TX = 29.0 MHz
Thanks to all who responded to my question.
Seems that something strange is going on with my K2 (-:
Reading through the responses it strengthened my feeling I did the procedure
(as described by Wayne, n6kr getting an exact difference of 10.000 MHz
between tp1 and tp2) correct. But my readout i
Struggling to get the freq readout of my k2 correct (using various methods
as described on w3fpr's website).
Now I am doubting everything (including myself..) so, but to be sure..
What should the readout on the K2 displaying, If I had a carrier at 10.000
MHz and tune it in CW, USB and LSB t
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