[Elecraft] bfo testpage 59

Sat Nov 9 15:19:00 2002

Don
I have replaced the transistor that you suggested and checked both of them
and they both tested good so it is something else causing the problem I did
verify the crystals and both are the correct ones both diodes are correct
everything looks good but I still get a reading of 3.44 as my variation not
the 3.6 and definitly not the between 4 and 6 like the manual says. I am
lost

----- Original Message -----
From: "Don Brown" <[email protected]>
To: "David Schornak" <[email protected]>
Sent: Saturday, November 09, 2002 12:42 PM
Subject: Re: [Elecraft] bfo testpage 59

> Hi
>
> Yes there is a J310 in the KIO2 kit you could try that one if you have it.
> You can do a DMM ohm meter check. Set your ohm meter to the diode check
> function and measure from the gate to the drain and source then reverse
the
> leads one way you should read open the other you should read about .700
like
> a diode. If your meter does not have a diode check function measure a
diode
> 1n4148 or 1n4007 and change ranges until you see a forward reading of .5 -
> .7 on the meter. This will usually be the 1K range. Use this range to make
> your test on the FET transistor
>
> Don Brown
> KD5NDB
>
>
> ----- Original Message -----
> From: "David Schornak" <[email protected]>
> To: "Don Brown" <[email protected]>
> Sent: Saturday, November 09, 2002 11:25 AM
> Subject: Re: [Elecraft] bfo testpage 59
>
>
> > is there a q 24 type transistor in any of the option kits for the k2 as
I
> > have them all and could borrow one from the option kit to test with?
> >
> > ----- Original Message -----
> > From: "Don Brown" <[email protected]>
> > To: "David Schornak" <[email protected]>; "Elecraft"
> > <[email protected]>
> > Sent: Saturday, November 09, 2002 11:26 AM
> > Subject: Re: [Elecraft] bfo testpage 59
> >
> >
> > > Hi
> > >
> > > I had a K2 with a narrow BFO range and the problem was a bad Q24. You
> > could
> > > carefully remove Q6 or Q7 on the control board and install it in place
> of
> > > Q24 to see if this fixes the BFO, if so then the transistor is bad and
> > order
> > > another one. Q6 and Q7 on the control board are for audio muting so
you
> > > don't need them for this test.
> > >
> > > Double check all of the parts in the BFO circuit making sure the
> varactor
> > > diodes and crystals are the correct ones. The filter crystals and the
> BFO
> > > crystals are different even though they are marked with the same
> > frequency,
> > > make sure you did not mix them up.
> > >
> > > Don Brown
> > > KD5NDB
> > >
> > >
> > > ----- Original Message -----
> > > From: "David Schornak" <[email protected]>
> > > To: "Elecraft" <[email protected]>
> > > Sent: Saturday, November 09, 2002 9:50 AM
> > > Subject: [Elecraft] bfo testpage 59
> > >
> > >
> > > bfo test
> > > initial reading 4916
> > > hi 4916.92
> > > low 4913.48
> > > difference it 3.44
> > >
> > > no my 4 mz oscillator calibration has not been set as I don't have
> anther
> > > receiver handy or a frequency counter that is handy I have checked all
> the
> > > components in the bfo but to no avail my difference still is not >=3.6
> > what
> > > can I do?
> > > or what should I do.
> > >
> > >
> > > see ya
> > >
> > > 73's
> > > KG4LSK
> > > David Schornak
> > >
> > > K2 03027
> > >
> > > arf arf arf
> > > don't forget me
> > > Mis Ginger
> > >
> > >
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