[Elecraft] freq.accuracy?

Sun May 4 02:39:00 2003

Larry and Gang

I've just been comparing my PLL (and BFO) modified K2 for frequency
error/drift.

After adding the BFO mod a few weeks ago, the error over 90 minutes on
29.000 MHz was:

Start    30 mins    60 mins    90 mins
+253    +153        +124        +110

That was measured in normal shack temperatures of around 18 to 20 degrees C.

After adding the PLL modification and re-running CAL PLL, the errors on 29
MHz are:

Start    30 mins    60 mins    90 mins
-44        -5            +8            +13

The error read  +15 Hz some 3 hours later.

Errors measured on all bands this morning (after 30 mins warm up) are:

1.8 MHz -11 Hz
3.5 MHz -11 Hz
7 MKz   -17 Hz
10 MHz  -21 Hz
14 MHz  -16 Hz
18 MHz  -30 Hz
21 MHz   +5 Hz
24 MHz   +3 Hz
29 MHz   -5 Hz

These were measured on transmit with reference to an off-air standard locked
to MSF on 60 KHz, feeding a Racal 9916 counter.

73's Dave, G4AON
K2 #1892

----- Original Message ----- 
From: "N0SA" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 04, 2003 2:23 AM
Subject: [Elecraft] freq.accuracy?

> I just added the drift compensation mod to my K2/100, SERIAL #3045. It
does
> a great job. My drift was up over 100 hz and is now down to around 10 hz.
>  The reason for this post is that after I readjusted my K2 PLL and BFO I
> notice that I am very close to my other rig and freq. counter on the lower
> bands (within 30 hz) but when I get up above 18Mhz my K2 seems to be about
> 120Hz off freq. Whereas on 18 and below I am wiyhin 30 to 40 Hz.
> I was just wondering if this is within reason or should the higher freq's
be
> closer?
> Larry  N0SA