From: "Steve Andrew"
Subject: Re: 10.7MHz video demodulator
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Date: Sat, 18 Jan 2003 21:37:06 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 08:37:06 EST
Organization: BigPond Internet Services (http://www.bigpond.net.au)
Martin Peters wrote:
>>> Anyone have a circuit, or ideas, for a simple, no-frills video
>>> demodulator to hang off the back of my ICR8500 receiver? The IF
>>> is centreed on
>> Surely it doesn't have enough bandwidth to handle video? What sort
>> 'video' do you have in mind?
> I'm pretty sure when I say than the bandwidth is of the order of a
> couple of megs, OK for mono pictures?
> Icom sell a TV adapter than takes its feed from the 10.7 tap but
> a)discontinued, which means b)they're like gold dust, and priced
> One hair-brain scheme I had in mind was to mix the 10.7 with a UHF
> oscillator (from the guts of a TV modulator?) and let a normal TV do
> the demod.
> Regards - Martin
Not so hairbrained at all Martin. It's probably the simplest, quickest
and cheapest way of doing it. This link is for a converter for the
AR5000, but should work well with your R8500.
Note that your ICOM may superimpose 10-15 volts on the IF output - My
ICOM R7000 does. I cannot say what bandwidth your R8500 has at 10.7MHz
but my ICOM R7000 bandwidth is around 5-6MHz so you should be able to
receive the sound and colour carriers as well.
Also, check this link for other article relating to TV via your radio.
It includes a couple of articles on filtering as applied to ICOM
scanners/receivers, as well as a wealth of info on DX TV reception.
If you need any further info, please feel free to email me.