[HBQRP] VFO Toroid saga

[ssellmeyer]

Ohhhhhhhhhh Noooooooooo ! !  I just rewound it for 40 M  with the present 23
turns............and I have a 30M kit. Duhhhhhhhhhhhhh. I forgot the Elmer
101 is for a 40M version. Duuuuuuuuhhhhhh #2

I looked thru the instructions that came with the kit but didn't see where
the 2.4 Mhz was referenced anywhere.
Oh well. Back to the drawing board !

SteveWBØQQT      P.S. Yes Dar, we are Grrrrrrrrrrr..........having fun
now.........I think !


----- Original Message -----
From: "K0AWB at Cox.net" <k0awb at cox.net>
To: "ssellmeyer" <ssellmeyer at inebraska.com>; "Midwest Homebrewers Group"
<hbqrp at mailman.qth.net>
Sent: Wednesday, November 23, 2005 2:50 PM
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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