147.475 in Melbourne

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147.475 in Melbourne

Postby VK3LDR » Sat Jan 19, 2008 10:44 pm

G'day,

I've been baffled ever since I've been on air as to what it is that operates on 147.475Mhz that almost sounds like a duplex conversation? Also there are no formal callsigns used as well... I know it can be heard around the Eastern suburbs..

Please explain?

Thanks,
Dave
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Re: 147.475 in Melbourne

Postby VK3ALB » Sat Jan 19, 2008 11:09 pm

Dave,

The transmissions have been going on for years and are mostly replays of old 2m/160m crossband contacts. Take a look here http://crossbandradio.com/ for an idea of what it's all about.

Lou.
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Re: 147.475 in Melbourne

Postby VK4GHZ » Sun Jan 20, 2008 9:07 am

Is Dave still doing that?
LOL!

I was a 'missions' listener back in the early 90's.
Very entertaining. :D
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Re: 147.475 in Melbourne

Postby VK3LDR » Sun Jan 20, 2008 11:21 am

I've been puzzled about that for months! Just after I posted up I did yet another google search for info and found that site you listed Lou and one other one with some info. I find it very strange to be honest, and am still a bit puzzled about it and how the whole duplex thing was setup..

Atleast now I finally sort of know what it is!
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Re: 147.475 in Melbourne

Postby VK3ALB » Sun Jan 20, 2008 11:32 am

I'm guessing the audio from the 160 operator was mixed with the received 2M transmissions from the other participants and transmitted on 160. I understand all side of the discussion could be heard on 160. I'm sure someone out there knows how it was done.
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Re: 147.475 in Melbourne

Postby VK4GHZ » Sun Jan 20, 2008 3:43 pm

Dave was (still is?) an Audio Op at the ABC, when I was there.
Audio and broadcasting "is his thing".

The 2M FM audio would have been fed thru a mixer, along with local mic, thru the optimod limiter, and into the 160M AM TX. There was always a 1/4" recording made of mixer line-out at the same time... and this is what is being replayed these days.

The other guys on 2M were listening to 160M composite signal with cans to prevent acoustic feedback.

Our own group back in Melbourne used to do crossband QSOs using 6M FM, 2M FM, 70 FM and sometimes 23 FM as well.
If you were going to do it properly, and provide a "clean feed mix-minus" to all participants, you would chew up a lot of rigs to do this! :wink:

All good fun when the other bands were dead. :D
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Re: 147.475 in Melbourne

Postby VK3OP » Sat Feb 09, 2008 12:10 pm

Yeah, Dave still does the "Missions", you will also hear them on 160 am and 6mx FM, he is no longer staff at he ABC but works as a freelance audio recordist.
There is a website which attempts to explain the "Missions" and even has a "Missionish" dictionary
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