[HBQRP] VFO Toroid saga

[Piatt, Darwin]

Isn't this the same thing?
 
"In other words you remove turns to raise the frequency or add turns to increase."

If you remove turns to raise the frequency, would not adding turns lower the frequency?

Now, I'm confused......  :)

Darwin (Dar) Piatt  W9HZC


-----Original Message-----
From: hbqrp-bounces at mailman.qth.net [mailto:hbqrp-bounces at mailman.qth.net] On Behalf Of ssellmeyer
Sent: Wednesday, November 23, 2005 12:03 PM
To: Midwest Homebrewers Group
Subject: [HBQRP] VFO Toroid saga

Short and sweet, here are this mornings experiments. As stated earlier I had 27 turns of # 22 wire on the toroid which gave me 2.625 Mhz. 

After removing 2 turns (now at 25 turns) I had 2.89 Mhz. Looks like I'm getting there eh ??

Removing two more turns (now at 23turns) I have 3.071 Mhz. Think I'm going to leave it there and see what happens later.......if anything.

I was Talking to KØNG, Charlie, last night here in Lincoln on 2 meters and told him the situation. He is an RF design engineer for Telex here in Lincoln and has bailed me out on occasions too numerous to mention here. He explained it to me as the same as trimming a dipole for the resonant frequency you are trying to achieve. In other words you remove turns to raise the frequency or add turns to increase. Made sense to me !  It appears to have worked. How about that. This old dog learned something ! !

Dale, in regards to the Radio Shack freq. counter and using a probe, I tried your method of NOT physically touching the board at Q2. I played around with resistor leads, a sewing needle and insulated wire but could not get a reading unless I touched it physically. I used the sewing needle to touch it with since my RF probe also uses a needle. I agree with you on the possibilites of loading, interaction etc. Many thanks for the tip. I'm here to learn and you guys are a big help. 

Lunchtime.............Steve/WBØQQT
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