In article , "nn" wrote:

"Eamon Skelton" wrote in message
news
What happens if you adjust L7?

73, Ed. EI9GQ.

I haven't touched it. But as far as I understand its there to avoid
oscillation
to disturb regulation process insuide L09. So it should have nothing
to do with the crystal "pushing". (Let me know if I am totally wrong...

Pasi-

The 1 microfarad capacitor prevents the regulator from oscillating.

L7 would normally be adjusted for maximum output from the oscillator
stage, but may also have an effect on frequency. Since it is all you have
to adjust, I suggest you adjust it.

I believe the crystal is connected in a series-resonant configuration,
which is less affected by circuit values. The only recourse may be to
purchase a new crystal.

73, Fred, K4DII

I believe the crystal is connected in a series-resonant configuration,
which is less affected by circuit values. The only recourse may be to
purchase a new crystal.
=======================
If crystal is indeed in series-resonant config. , by putting a trimmer of a
few pF in series with the crystal, it will highly likely be possible to pull
the freq 500 Hz.
After all this is only just over 4ppm of the nominal frequency.

Frank GM0CSZ / KN6WH

Frank and Fred,

Thank you for your help. I will try L7 first (and then trimmer of pair of
twisted wires).
Let's see what happens. I need counter to borrow first.. I will be back.

73 Pasi, oh2pt