Posted by
Mike Morrow-3 on
May 24, 2017; 4:04pm
URL: http://elecraft.85.s1.nabble.com/K1-VFO-frequency-range-tp7631062p7631071.html
I assume you have already calibrated the LCD display on each band using the OCF menue function. That makes the LCD indicate the actual transmitter output frequency, This display calibration for each band must be performed before adjustment of where the low end of each band starts.
Because the K1 has no way of adjusting the oscillation frequency of the individual heterodyne crystals on the filter board, the only band edge adjustment possible is accomplished by altering the VFO frequency. That affects both bands equally.
Your data show the K1 tuning band is too low by about 5.2 kHz. The VFO SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 frequency of operation you must LOWER the VFO frequency by squeezing CLOSER together some of the turns on the RF board L1 VFO toroid. It won't require much. Try that until the low end of 80m indicates about 3499.0 kHz on the LCD. That 80m L1 adjustment will also bring the low end of 15m to about 20996.1 kHz. That will be the closest you'll get on 15m. If you adjusted L1 until 15m starts at 20999.0, then 80m will start at 3501.9 kHz. You'll have lost some low end 80m coverage.
The K1 has been around since 2000, which is how long I've had #175. What's the serial on your recent K1? It's still a magnificent radio.
Mike / KK5F
-----Original Message-----
>From: roney <
[hidden email]>
>Sent: May 24, 2017 7:52 AM
>To:
[hidden email]
>Subject: [Elecraft] K1 - VFO frequency range
>
>Hello, I just finished all tests and adjustments in my K1.
>It works great. I have 2 filter band as 80m and 15m.
>It's transmitting and receiving very well.
>
>I followed all tests in:
>
>VFO Range Test (Page 38):
>VFO knob fully clockwise = 3.007 khz
>VFO knob fully counterclockwise = 3.091 khz
>VFO range = 84 khz
>
>So I did Band Assignments (Page 39), etc, etc.
>
>When seeing each band, my real ranges are:
>
>80m: 3.493,8 to 3.577,6 mhz
>15m: 20.990,9 to 21.074,6 mhz
>
>I did not understand how to adjust these low and high limits. Should I
>change some inductor turns ? or is there any menu adjust for these limits ?
>
>Thanks for the help,
>Roney Monte PY1ZB
>______________________________________________________________
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