Hi Danny,
Oh boy! this one brings back memories. In 1968 I got a MIRK
radio--multi-band radio that covered AM, FM, Shortwave 4 to 16 MHZ and the
30 to 50MHZ and 147-174 MHZ bands. I took the back off this radio (see he's
dangerous even at an early age) and discovered precisely what you reported.
I hooked it up to a 100 foot piece of wire and that thing when hooked into
an old Reel to Reel Sony tape machine put out a reasonable sounding FM (mono
of course) signal for about 3 blocks (directional) from my house. In
addition, if I pressed down the record button along with the pause button
between songs, I could get reasonably clear audio from the 5 dollar
microphone supplied with the tape machine--but I couldn't talk over the
songs while they were playing <g>!
Such memories!
----- Original Message -----
From: "Danny Dyer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 25, 2007 12:26 AM
Subject: Re: Using HT as tuning aid for FM radio
Similar to the 455kc IF carrier a typical AM broadcast radio puts out, 455kc
above the tuned frequency. There was a fellow at VSDB, Va School For The
Deaf And Blind, in Staunton, who figured out how to tap into the oscilators
in those old tube type radios, and there were several AM transmitters to
which one atatched some type of audio amp, with which to modulate it, and a
wire of some type for a transmitting antenna, and voila, a ready made,
pretty stable, normally pretty good sounding AM radio station---usually more
powerful than the average Phono Oscilator of the day, (for several years
after I got into commercial broadcasting, I had more radio experience than
legal experience.
----- Original Message -----
From: "Louis Kim Kline" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 24, 2007 11:29 PM
Subject: Re: Using HT as tuning aid for FM radio
> Hi Colin.
>
> What causes this is that you are actually picking up one of the mixing
> products that is used when the local oscillator in the FM radio is mixed
> down to the 10.7 MHz intermediate frequency.
>
> 73, de Lou K2LKK
>
> At 12:00 AM 1/24/2007 -0700, you wrote:
> >I never tried that trick until now...works absolutely great.
> >Using an old short wave receiver with FM in it, and putting the ict90 on
> >wide FM, i could actually listen to the audio clearly on the HT when the
> >receiver was tuned to a station 10.7MHZ down from the HT's receive
> >frequency..
> >What exactly causes this?
> >Presumably the receiver is resonating at that frequency and causing some
> >sort of signal to be inducted into the HT?
> >I didn't test how far away from the receiver I could go before losing the
> >audio on the HT....perhaps tomorrow.
> >73
> >Colin, CF6BKX
> >----- Original Message -----
> >From: "Kenneth Lee" <[log in to unmask]>
> >To: <[log in to unmask]>
> >Sent: Tuesday, January 23, 2007 6:45 PM
> >Subject: Using HT as tuning aid for FM radio
> >
> >
> > > Anyone ever try using their wide-band receiving HT to aid in tuning an
> > > analogue FM broadcast radio. I was trying to find a weak fm station
on my
> > > table top radio (it's a Teac R1 radio with analogue tuning). I wanted
to
> >be
> > > sure I was on frequency before adjusting the antenna so I added the
10.7
> >1st
> > > IF frequency to the station I wanted to receive and punched it into my
> >T90.
> > > The station is on 103.1 WRNR, so I punched 113.8 into the HT and
opened
> >the
> > > squelch on the HT. Then I tuned the Teac until I heard a "bump" in
the
> > > static. I verified this works by tuning into several known local
> >stations.
> > > I guess the Teac is not very well shielded because I could hear the
> >station
> > > I was tuned to over the HT. I also tried this trick on my Tivoli
Model 1
> > > and an old RS MTA-8 radio and the technique worked on all. This trick
> > > doesn't work as well on stations below 97.3 since adding the 10.7 IF
> > > frequency may put you on another strong broadcaster.
> > >
> > > For the record, the Teac is no dx'er but sounds great on the local
> >stations,
> > > I could not hear WRNR at all on the Teac or RS radios. The same
station
> >is
> > > useable (some noise) on the Tivoli and almost full quiting on my
Sat800.
> >I
> > > am being unfair to the Tivoli since it's at ground level and the
Sat800 is
> > > upstairs.
> > >
> > > 73, Ken -N5SWR
> > >
> > >
> > > --
> > > No virus found in this incoming message.
> > > Checked by AVG Free Edition.
> > > Version: 7.5.432 / Virus Database: 268.17.8/648 - Release Date:
1/23/2007
> >11:04 AM
> > >
> > >
> >
> >
> >
> >--
> >No virus found in this incoming message.
> >Checked by AVG Free Edition.
> >Version: 7.5.432 / Virus Database: 268.17.10/651 - Release Date:
1/24/2007
> >6:48 PM
>
> Louis Kim Kline
> A.R.S. K2LKK
> Home e-mail: [log in to unmask]
> Work e-mail: [log in to unmask]
> Work Telephone: (585) 697-5753
|
