69mhz to 89mhz broadcast stations pro 2006

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69mhz to 89mhz broadcast stations pro 2006

Postby Luke » Wed Feb 22, 2017 7:39 pm

Thanks for letting me join

I have just got a new realistic scanner pro 2006 and I never noticed this on my old one that died (same model) but from 69mhz to 89mhz I am getting lots of broadcast radio stations coming through like radio one and local stations etc. with some overlapping. Never noticed this before on my old 2006. Is this normal and are there radio stations or some kind of studio feeder links between 69mhz to 89mhz?

I can only hear them on WFM? NFM and AM just a bit of noise. I know broadcast fm radio is from 89 to about 108mhz. Is it bleedthrough or a quirk of the scanner or are there radio stations or some kind of studio feeder links between 69mhz to 89mhz?
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Re: 69mhz to 89mhz broadcast stations pro 2006

Postby m0lsx » Wed Feb 22, 2017 8:56 pm

A couple of options.
One are you using a preamp? Overloading the front end can cause all sorts of issues.
Two, it could be mixing. Your radios IF is 10.7mhz.
The broadcast band two VHF is 87.5 to 108MHz.
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Re: 69mhz to 89mhz broadcast stations pro 2006

Postby Luke » Wed Feb 22, 2017 9:03 pm

Not using any kind of amplifier. Just the pro 2006 plugged in at the mains. Plugged in is a discone antenne.

Mixing?

Is that like bleedthrough or similar? "IF is 10.7mhz" will that cause bleedthrough 10.7mhz down? In that case it sounds the problem as it starts and stops about 10.7mhz down from the actual broadcast band.
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Re: 69mhz to 89mhz broadcast stations pro 2006

Postby m0lsx » Thu Feb 23, 2017 9:27 am

Mixing is where the radios internal frequencies mix with the received frequencies in combination to give an output on a unwanted frequency.
Do you hear all of the Band 2 broadcast stations? If not it may be worth looking at if the ones heard all relay from the same site as the commercial broadcasters have a terrible record for engineering, with some transmitters being used by Absolute Crap Radio clearly having audio issues for weeks at a time & if it's just some, then Intermodulation is a another potential contender.
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Re: 69mhz to 89mhz broadcast stations pro 2006

Postby Chris P » Thu Feb 23, 2017 10:09 am

the image will be 21.4 Mhz below the true frequency so should cover the range 65.6 to 86.6


The local oscillator in a superhet with an IF(intermediate frequency) of 10.7Mhz -runs at either 10.7 Mhz above the frequency of the signal you want to receive or 10.7Mhz below it so there will be an output of a received signal at the IF from frequencies 10.7Mhz both above and below the local oscillator see page 15 of the pro2006 manual . In double or triple superhets it gets even more complicated as there are two or more IF`s (often 10.7 Mhz and 455Khz ) which can produce multiple image frequencies
Regards Chris aka G8FFF nipper or tazmin88
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Re: 69mhz to 89mhz broadcast stations pro 2006

Postby Chris P » Thu Feb 23, 2017 12:36 pm

Further to my post above please see the reference on page 29 of the manual to reception of image frequencies
Regards Chris aka G8FFF nipper or tazmin88
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