Keith, I would appreciate a PDF if possible.
-----Original Message-----
From: For blind ham radio operators
[mailto:[log in to unmask]] On Behalf Of Keith Barrett
Sent: Wednesday, March 19, 2008 8:48 AM
To: [log in to unmask]
Subject: Re: valve radios revisited
Hi,
Could have been me you were referring to.
Several years ago, a friend built several audible meters for me. They
are a small bbox with two so239 sockets, for input and output. There is
a switch to select forward and reverse power. One tunes for the highest
tone when tuning transmitter or linear and lowest tone when in reflected
mode. You can leave the swr mode selected as 0 reflected results in no
sound, useful if the aerial falls off.
The circuits were published in The radcom sevferal years ago. I did
offer to send them to anyone who was interested at the time but got no
takers.
Not sure if the articles can be accessed from the RSGB webb site but I
could probably send them to anyone interested. I think I may have a pdf
somewhere but would need to try and find it.
On 19 Mar 2008 at 9:45, Buddy Brannan wrote:
> Hang on, some time ago there was an article for an audible SWR meter
> by someone who used to be on this list. I'll have to dig it up.
> On Mar 19, 2008, at 9:36 AM, Shaun Oliver wrote:
> > I could I suppose build a tone osilator to run between the radio and
> > the antenna, that wouldn't be too hard, take apart an old vswr meter
> > and drop an osilator and speaker in in place of the guts of the vswr
> > meter.
> >
> > Shaun
> > web sites:
> > http://www.myspace.com/blindmanshaunoliver
> > http://blindman.homelinux.org/~blindman/
> > skype: brailledude
> >
> >
> > On 20/03/2008 12:27 AM, the old scribe known as Howard Kaufman was
> > able to impart this pearl of wisdom:
> >> I'd trust the attenuated rx more than the marked knobs. Something
> >> like rain might change the tuning, and your marks wouldn't be
> >> accureate. I don't know why you are trying to read the internal
> >> meter, rather than the watt meter outside the radio. If you do it
> >> that way, you have a system that you can use to tune any radio, not
> >> just one.
> >>
> >>
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>
> --
> Buddy Brannan, KB5ELV - Erie, PA
> Phone: (814) 746-4502 or 888-75-BUDDY
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