¿ªÔÆÌåÓý

Re: day light again `inquiry


 

¿ªÔÆÌåÓý

Ashhar, the false signal moves exactly in the same direction as the original.

?

Allison, Thanks. BTW, your idea on the pin and slotted sleeve for the tuning screw works like a champ. I used a 10-32 brass screw and have a nice range with it. Does not cover the complete band, but good enough for my needs. No noise, smooth, 5.7KHZ per rev and the knob stays put.

Barry

?

Sent from for Windows

?

From: Ashhar Farhan
Sent: Thursday, September 22, 2022 10:11 PM
To: [email protected]
Subject: Re: [BITX20] day light again `inquiry

?

?Barry,

Which way does the spur tune? That is, if you tune up by 1 KHz, does the spur move up or down? And by how much?

?

On Fri, Sep 23, 2022, 7:17 AM ajparent1/kb1gmx <kb1gmx@...> wrote:

Most likely are those mentioned, the PTO is not clean, that being harmonis or spurious oscillations.
Another is the crystal filter is not working as expected, If you just took 7 crystals and wired
it up you can bet on that.? Minimally they must be matched to the same frequency +-100hz or less.
The BFO could also be getting into the front end via radiation or poor board layout or the oscillator
could have spurs.



Allison
------------------
Please use the forum, offline and private will go to bit bucket.

?

Join [email protected] to automatically receive all group messages.