GM James,
I think you will be fine with a 15.4KHz range. The problem when approaching
ranges much greater than that is that although the K2 firmware will linearize
the VFO adequately, the granularity of fine increments may start to suffer, and
it'll be more susceptible to temperature change.
If you like to experiment and have enough #26 red enamel wire left, you might
try taking off another turn and see what the range is. If not, then I think you
will be just fine with your range.
BTW - I did all the testing for this change and used a set of cores to perform
multiple tests. I saw these variances as well from the same batch of cores. The
mix varies some between cores and produces different inductances with the 15
turns of #26 wire. Some I had to take a turn off and some were fine. I had one
that produces a 18KHz range. Pulling a turn returned it to around 15KHz.
73,
Dave, W8FGU
On 11/5/2021 8:27:26 AM, "JAMES GUNNOE" <[email protected]> wrote:
To follow up on my question about the PLL range test, how critical is it to be
at or below 15Khz? Currently I am at 15.40Khz after playing around with the
winding spread. The errata sheet says to be between 9.98Khz and 15Khz
difference in the high and low reading.
73
James, KJ4KEM
On 11/04/2021 7:57 PM Comcast <[email protected]> wrote:
Hello again,
Still building a K2. I got to the PLL reference oscillator range test and did
have to remove one turn from the toroid.My range at first was 20.6 Khz.
I got it down to 15.38Khz. I am worried if I remove another turn it will be
too low. I went ahead with the continued testing and all the numbers (test
results) are good.
I stopped for the night on the BFO alignment.
My questions is, is the 15.38Khz ok or do I need to remove another turn from
the toroid?
73
James, KJ4KEM
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