Fwd: Re: [10m] Small set-back for the KO6BB/B beacon

[Barry Sherwood]

--- Barry Sherwood <barry_sherwood at yahoo.com> wrote:

> Date: Thu, 8 Mar 2007 09:40:23 -0800 (PST)
> From: Barry Sherwood <barry_sherwood at yahoo.com>
> Subject: Re: [10m] Small set-back for the KO6BB/B
> beacon
> To: Philip KO6BB <ndb_fch-344 at sbcglobal.net>
> 
> The ring is an inductance which is used in
> combination
> with the coax stub on the original Cshcraft AR-10.
> The
> stub is the capacitive component. This forms an LC
> circuit to match the feedline to the high impeadence
> end fed 1/2 wave antenna. You could set the vertical
> length to the 1/2 wave length for the portion of the
> band you plan on using and then replace the stub and
> ring with a coil and capacitor combo or leave it as
> is
> and try shortening the coax stub. 
> 
> Good Luck
> Barry, KF5GC
> 
> --- Philip KO6BB <ndb_fch-344 at sbcglobal.net> wrote:
> 
> > Hi All,
> > 
> > The latest project that I've been working on for
> > about a month has a small
> > setback.  I'm building a 10 Meter CW beacon.  I
> > gutted a JC Penny 40 Channel
> > CB of it's receive and audio circuitry, replaced
> the
> > final and driver with
> > slightly beefier units, beefed up the final
> > heatsink, changed one Xtal,
> > added some "keying" circuitry with an RS-232 opto
> > coupler interface and I
> > get about 7 Watts of CW out of it. It works well.
> > 
> > It will be keyed from an OLD NEC Pentium laptop
> > running Win95A.  It doesn't
> > have enough horsepower or memory (24MB RAM) to use
> > for anything except
> > logging and other older, simple programs.  I have
> a
> > very nice DOS beacon
> > keyer program that runs well on it, let's you set
> up
> > about any message/ID
> > pattern that you want and can alternately key at
> two
> > different speeds
> > (presently set about 16 and 6 WPM).  The message I
> > presently have stored in
> > it reads "VVV VVV VVV DE KO6BB/B KO6BB/B GRID
> CM97SF
> >  K".  To prevent wear
> > on the Hard-drive I will unplug the drive (slides
> > in) and run the DOS
> > program from a floppy.  Both the Radio and
> computer
> > will run 24/7 off the
> > station battery (kept on constant charge).
> > 
> > Anyway, the setback I had concerns the dedicated
> > beacon antenna.  I
> > "salvaged" an old Cushcraft Ringo CB antenna,
> > figuring on retuning it for
> > 10M.  All the fastening hardware was heavily
> rusted,
> > was cut off and
> > replaced with stainless steel hardware.  The
> "ring"
> > was stress broken right
> > at the mounting bolt.  I flattened a half inch and
> > reconnected it.  Since
> > the ring is adjustable, and the frequency is now
> > higher I figured that
> > wouldn't hurt it any. After reassembly, adjusting
> > the length according to
> > the Cushcraft instructions etc. I checked it with
> a
> > friends MFJ antenna
> > analyzer.  It was nicely tuned to 24.6 MCs!  I
> > collapsed some of the
> > sections to shorten the antenna.  NO effect on
> > antenna tuning!! It's been
> > checked and rechecked, just doesn't make any
> sense,
> > other than that perhaps
> > the CBer had already shortened the ring or
> > something. . .  I'm apparently
> > seeing the resonant point of the ring rather than
> > the antenna proper.  In
> > any case,  I gave up on getting that thing tuned
> to
> > 10M.  I'm keeping the
> > aluminum though.  If I remove the ring and add
> > radials (or use it over my
> > metal roof) it can be made into a 1/4 wave
> vertical
> > for any one band from
> > 20-10M.  I'm going to try to get a Solarcon A-99
> > (1/2 wave fiberglass
> > vertical) for the 10M beacon, hopefully later this
> > month.
> > 
> > 73 de Phil,  KO6BB
> > DX begins at the noise floor!
> > 
> > THE BEACONEER'S LAIR:  
> > http://www.geocities.com/ko6bb/
> > MY RADIO-LOGS:      
> > http://www.geocities.com/ko6bb/Logs/
> > QSL GALLERY:
> > http://photobucket.com/albums/f306/KO6BB/
> > Merced, Central California,    37.3N  120.48W 
> > CM97sh
> > 
> > _______________________________________________
> > 10m mailing list
> > 10m at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/10m
> > 
> 
> 
> 
>  
>
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