[HBQRP] VFO Toroid saga

[Piatt, Darwin]

Ain't this fun? Can't say we are not all learning things.. Wonderful.
Now if I can just get that broadcast station out of my 80 meter Pixie :)
I'm a little behind on the SW but will be caught up this weekend..
Having fun yet?
Everyone have a good weekend, wind those Toroids...

Darwin (Dar) Piatt  W9HZC


-----Original Message-----
From: hbqrp-bounces at mailman.qth.net [mailto:hbqrp-bounces at mailman.qth.net] On Behalf Of K0AWB at Cox.net
Sent: Wednesday, November 23, 2005 2:51 PM
To: ssellmeyer; Midwest Homebrewers Group
Subject: RE: [HBQRP] VFO Toroid saga

Steve and everyone...

Sounds like you are having fun experimenting.  Keep winding those toroids.

As I was winding toroids this afternoon... I was trying to figure out why
Steve was getting such different results than I did... then it occurred to
me...  he isn't... :)

The VFO in the 40 meter version runs at 3.000 - 3.035 MHz with a 4.00 MHz IF
to cover  7.000 -  7.035 MHz (40 meters)

The VFO in the 30 meter version runs at 2.420 - 2.455 MHz with a 7.68 MHz IF
to cover 10.100 - 10.135 MHz (30 meters)

The VFO in the 20 meter version runs at 5.000 - 5.035 MHz with a 9.00 MHz IF
to cover 14.000 - 14.035 MHz (20 meters)

I thought the 25 turns on L1 sounded familiar... that's the number I just
wound on L1 for the 40 meter version I'm building.

The 40 meter version uses 25 turns for a 3.0 MHz VFO.

The 30 meter version has 4 more turns to drop the VFO frequency down to
2.4..something MHz.
So if 23 turns = 3.071 MHz.
      25 turns = 2.890 MHz
      27 turns = 2.625 MHz
      29 turns should be about 2.4 MHz... for 30 meters.

Don't worry about getting the VFO exactly on frequency, we calibrate it in a
later step.

73... Darrel... K0AWB

-----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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