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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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19th Jul 2017, 8:16 am | #1 |
Rest in Peace
Join Date: Mar 2011
Location: Basildon, Essex, UK.
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AR88LF Receiver.
hi
After my current restoration of the KB 428 I am thinking of starting on the AR88 LF. One question I have is about the resistor units on the schematic diagram. Here are some examples of how they are marked; 2.2 Meg, 1000, & 680 M. The 2.2Meg and 1000 seem clear enough but what on earth is 680 M. Thanks Mike |
19th Jul 2017, 8:24 am | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Ar88 lf
680k.
Basically meg = megohm. m = kohm Lawrence. |
19th Jul 2017, 8:45 am | #3 |
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Re: Ar88 lf
It's a diagram from a different era. The term 'picofarad' wasn't used and you'll see mention of micro-micro-farads instead. Valves are drawn upside down.
David
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19th Jul 2017, 8:56 am | #4 |
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Re: Ar88 lf
I thought it probably was, but why on earth M for Kohm.
Mike |
19th Jul 2017, 9:16 am | #5 |
Dekatron
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Re: Ar88 lf
Dunno, maybe using meg as a reference then using milli.....1,000th of a meg?
The "m" prefix isn't used in the AR77 schematic. Lawrence. |
19th Jul 2017, 10:19 am | #6 |
Dekatron
Join Date: Nov 2011
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Re: Ar88 lf
Roman numeral "M", or 1,000x multiplier. From an era when everything Roman was drummed into children's heads at javelin-point. One of those things that turned up here and there before SI standardisation and 1,000x went Greek (kilo!).
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19th Jul 2017, 10:45 am | #7 |
Heptode
Join Date: Sep 2009
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Re: Ar88 lf
Indeed, as also seen here on the tacho of a 1946 MG.
Gordon |
19th Jul 2017, 11:39 am | #8 |
Rest in Peace
Join Date: Mar 2011
Location: Basildon, Essex, UK.
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Re: Ar88 lf
I suppose that makes a tiny little sense.
Thanks guys It all helps to understand and remember. Mike |
19th Jul 2017, 11:56 am | #9 |
Dekatron
Join Date: Apr 2012
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Re: Ar88 lf
BTW if you dig around on the VMARS site you can find an AR88 schematic that's been redrawn from the US style to the 1940s/1950s UK-military style - a lot more readable, at least the valves are the right way up!
Can't remember if the diagram there is for a D or a LF though.... |
19th Jul 2017, 10:53 pm | #10 | |
Nonode
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Re: Ar88 lf
Quote:
Cheers, |
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20th Jul 2017, 6:50 pm | #11 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
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Re: Ar88 lf
So isn't that a devalued English Million by the same amount as an English Billion?
I think it is...Or? |