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"RF Truck" transmitter

 
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"RF Truck" transmitter

Post by crackle » Sat Dec 27, 2014 10:33 am

Hi
Please can any one tell me anything new about this transmitter, see Radio museum; http://www.radiomuseum.org/r/standard_r ... le_2m.html
Where were they made, (which STC factory) who they were made for/used by and for what purpose.
Any other information would be very welcome.

Thanks
Mike

 
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Location: Aylesbury, Bucks.

Re: "RF Truck" transmitter

Post by GlowingAnode » Sun Dec 28, 2014 9:34 am

Hi Mike,
I can't offer any specifics but hopefully can answer a couple of points.
This transmitter covers the HF bands, it would have been most likely been used for commercial shipping communication.
I'd date it a little later than RM does, I'd say mid to late 50's.
The reference to "RF truck" means the unit was mounted on wheels, and could be rolled and repaired or replaced in the event of failure. It would never have been lorry mounted for mobile operation.
STC could never compete with Marconi Wireless in this country, most of their kit went for export to Europe and Africa. A lot was manufactured under license in Australia.

Cheers,
Rob.

 
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Re: "RF Truck" transmitter

Post by crackle » Sun Dec 28, 2014 9:40 am

hi Rob
I thought commercial shipping has for a long time had designated frequency bands in the low HF region.
I wondered if they were used for relay of forces radio.

Mike

 
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Joined: Wed Aug 17, 2011 5:03 pm
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Re: "RF Truck" transmitter

Post by GlowingAnode » Sun Dec 28, 2014 11:28 am

HF shipping covers 2 - 30 MHz as agreed by ITU, listing here; http://www.navcen.uscg.gov/doc/rtchan.txt
MF (1.6 - 2.0 MHz or trawler band) is now only used by the Coastguard.
The transmitter featured on RM appears to be a SSB transmitter, so unlikely it was ever used for broadcast.

Rob.

 
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Re: "RF Truck" transmitter

Post by Michael Watterson » Sun Dec 28, 2014 8:45 pm

1949 seems very early for SSB. 1950s seems more likely. Though Telephone trunks used SSB in 1930s! Copper oxide based ring diode mixers I think.

Actually I'm sure I physically saw it in Luzern when I had a quick tour of the store. When Ernst retired he kept the basement and some of the offices of the building that used to house his Datacentre. It's not open to public as that would cost too much. He personally is paying the costs and isn't sure about the future of that very large collection that now belongs to the Foundation. Reception and 3 or 4 offices (completely full) have glass display cases of models. Perhaps four medium rooms and one giant room in Basement stacked high with industrial shelves of Radios etc.

Edit: studied photo. I remember that room. Definitely did see it!

It would NOT have been for Forces Radio.

 
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Re: "RF Truck" transmitter

Post by crackle » Mon Dec 29, 2014 12:42 pm

How do you know it is SSB, what is the give away?

Thanks
Mike

 
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Re: "RF Truck" transmitter

Post by Michael Watterson » Mon Dec 29, 2014 10:58 pm

Rob?
Why do you think it's SSB?


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