[Elecraft] XV432 Frequency and Power Stability

[Johnny Siu]

> Hi Stu,
>=20
> I am anxious to know the answer too.  Please keep the group
> informed about how you solve your problem. This could be the
> reason why I have been hesitating to order my XV432 for
> years.
>=20
> 73
>=20
> Johnny Siu VR2XMC
>=20
>=20
> --- 2008=A6~8=A4=EB31=A4=E9 =ACP=B4=C1=A4=E9=A1AStu2 <stu at stu2.net>
> =BCg=B9D=A1R
>=20
> > =B1H=A5=F3=A4H: Stu2 <stu at stu2.net>
> > =A5D=C3D: [Elecraft] XV432 Frequency and Power Stability
> > =A6=AC=A5=F3=A4H: elecraft at mailman.qth.net
> > =A4=E9=B4=C1: 2008 8 31 =ACP=B4=C1=A4=E9 =A4W=A4=C8 3:54
> > Hi All,
> >=20
> > I finished assembling a XV432 transverter and seem to
> have
> > a little=20
> > problem with both power and frequency stability. After
> > going through the=20
> > alignment steps, the power starts dropping from 20W
> down to
> > about 10=20
> > after sending CW into a dummy load for 20 seconds or
> so.
> > During this=20
> > time, the frequency drifts about 100 Hz. (Enough to
> detect
> > a pitch=20
> > change in another receiver.)
> >=20
> > I installed Q1 using the Teflon spacer. I have the
> crystal
> > oven=20
> > installed and the transverter was powered on for about
> 30
> > minutes or so=20
> > before I aligned it. (JP9 is on 4-5.) The part values
> > appear to be=20
> > correct. The problem appears if I use a 5W source or a
> 1
> > milliwatt=20
> > source. (Changing JP3,4,5,6 accordingly.) My radio is
> a
> > SDR-5000A.
> >=20
> > The power module doesn't get warm.
> >=20
> > I do NOT have the extra 5 turn coil and the 10pf
> capacitor
> > installed on=20
> > the power module. (Rev C1 errata.)
> >=20
> > Has anybody else had this problem and if so, how did
> you
> > fix it.
> >=20
> > Thanks!
> >=20
> > Stu
> > W7IY
>=20
>=20
>=20
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