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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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10th Jan 2019, 3:19 pm | #1 |
Heptode
Join Date: Jun 2008
Location: Cambridgeshire, UK.
Posts: 613
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Canadian HF receiver
Clearing out an old cupboard I found a photo of my old Canadian receiver but can't remember what the model was or the manufacturer.
The only memory I have of it was that the local oscillator on one band was near to the IF of the old 405 line TVs and even with double screening in the case and chassis it could wipe out half the TVs in the street; I only used it in the daytime when the only program transmitted was the test card. Anyone recognise it; wishing in a way I'd kept it. |
10th Jan 2019, 6:29 pm | #2 |
Pentode
Join Date: May 2013
Location: Deal, Kent, UK.
Posts: 139
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Re: Canadian HF receiver
It's a Vancouver Radio Laboratories (VRL) model 250, made during WW2 for the Canadian Army. I still have mine.
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10th Jan 2019, 6:43 pm | #3 |
Heptode
Join Date: Jun 2008
Location: Cambridgeshire, UK.
Posts: 613
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Re: Canadian HF receiver
Many thanks M0SOE_Bruce; I think they were fairly rare at the time; never seen another.
Mike. |
10th Jan 2019, 6:44 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Re: Canadian HF receiver
That LO-leakage issue was common with the old National HRO too: on 14MHz the 3rd harmonic of the LO landed right on top of 405-line London BBC TV.
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10th Jan 2019, 6:46 pm | #5 |
Heptode
Join Date: Jun 2008
Location: Cambridgeshire, UK.
Posts: 613
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Re: Canadian HF receiver
Yes, G6Tanuki; I could never believe how strong the escaping signal was.
Mike. |
10th Jan 2019, 7:49 pm | #6 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,396
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Re: Canadian HF receiver
Intriguing- Radiomuseum has it down as 18 valves (including magic eye and rectifier) with single conversion, yet it boasts 2x 6L7 and 2x 6K8 valves. Perhaps one of these might be a product detector, another a dividing calibrator?
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10th Jan 2019, 8:44 pm | #7 |
Pentode
Join Date: May 2013
Location: Deal, Kent, UK.
Posts: 139
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Re: Canadian HF receiver
The manual says 19 valves which is odd as for a Canadian receiver it should have said 19 tubes.
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11th Jan 2019, 3:14 pm | #8 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,396
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Re: Canadian HF receiver
Quite a sophisticated set for the era then- a 6L7 as noise-gated 3rd IF amp and no less than 3 valves in the calibrator. Interesting that they provided a 10kHz marker option, at least this would have meant that the receiver could stand alone without the need for wave-meters or painstakingly made and high-resolution individual logging charts. Wonder what the rationale was behind using the other 6L7 as 2nd RF amp? Perhaps calibrator injection.
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