actually broadcast FM is 75 kc wide, plus an additional allowance for subcarrier, which brings the total up a bit more, not 20 kc, the hear aid and other transmitters are also in that range, if you fin them wider than 75 kHz it is because they are being overdriven. most do not have much if any dynamics control. I will have to go and look up exactly what the maximum spec is for fmbc with a subcarrier by contrast, narrow band ham stuff like we use is 5 kc, what they call wide fm on the receiver's menu, and the narrow setting gives you 2.5 kc, the correct setting for frs channels to be received properly
On Apr 12, 2013, at 10:47 PM, Gary Tillinghast <[log in to unmask]> wrote:
> Thanks Colin that was what I was looking for. will save it for future
> reference. KB2YAA
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, April 12, 2013 10:28 PM
> Subject: Re: UV5R
>
>
> hey gary:
> you can toggle between low and high band FM using the band button once you
> are in the FM broadcast receive mode.
> The band button is on the right side just above the enter key.
> That said, you don't have to toggle since the band is continuous receive
> from 65 to 108MHZ.
> Just type in 65 000 and then you can use the up arrow to scan up through the
> band if you want...there is no squelch control on the FM receiver
> unfortunately so you can have the radio do a frequency scan because it'll
> just stop on the open squelch.
> Also, bear in mind that any 70MHZ band transmitters, like for microphones
> and hearing assistance devices are extremely wide banded...in the 100 or
> greater KC range whereas commercial broadcast FM is 20KC's wide. This only
> means that audio from the wide banded devices may sound distorted or even be
> unreadable.
> However, I haven't tested it myself on anything so it may receive wide
> banded FM just fine.
>
> have fun and let us know what you find down there.
>
> 73
> Colin, V A6BKX
> ----- Original Message -----
> From: "Gary Tillinghast" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, April 12, 2013 7:10 PM
> Subject: UV5R
>
>
>> Hi all,
>> On the UV5R THERE SEEMS TO BE two FM bands to recieve. I read it =
>> somewhere on how to toggle between them, but couldn't remember where it =
>> was. Can someone supply me with the procedure? Thanks Gary KB2YAA
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