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Old 24th Feb 2018, 10:23 am   #1
Argus25
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Default The h-field transanalyser

I built this device to test and align vintage AM broadcast band transistor radios.

The idea is to have one compact piece of kit to do it all, without needing an general laboratory RF generator with accurate counter and a scope. Also to provide a system to assess the transistor radio's sensitivity. Three radios have been measured and their data added to the article.

I have uploaded the article on it to my website:

http://worldphaco.com/uploads/The__H...nsanalyser.pdf

I have attached some photos of the unit and the block diagram and the attenuator, which is one of the more interesting parts of it. The reasoning behind the design of it all is explained in the article.
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Old 24th Feb 2018, 11:29 am   #2
Terry_VK5TM
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Default Re: The h-field transanalyser

That is one nice bit of kit.

Extremely well done writeup too.
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Old 25th Feb 2018, 7:11 am   #3
Diabolical Artificer
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Default Re: The h-field transanalyser

Superb professional job as always. You set the standard, we strive to follow.

Andy.
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Old 25th Feb 2018, 2:21 pm   #4
astral highway
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Default Re: The h-field transanalyser

Beautiful work there , Hugo! Looking forward to reading the write up soon.
Thanks !
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Old 26th Feb 2018, 1:06 pm   #5
Wendymott
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Default Re: The h-field transanalyser

Great Job Hugo. Your write-up puts my ramblings to shame.
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Old 26th Feb 2018, 1:26 pm   #6
Argus25
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Default Re: The h-field transanalyser

Thanks Wendy.

One reason I write up my projects and put them on my website is that if a year or two goes by, I can get to them easily from any net connected computer and see what I did with some part of some circuit.

As time goes by it is hard to remember the finer details of different projects and it can be handy to have it in cyberspace, even if it is just the pin connections of some IC or the resistor values used in a circuit. Also it creates a good service resource if the thing breaks down and needs repair.

It adds extra time to a project to write it up in detail and web publish it, but its worth it in the long run and the articles might help someone else.
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Old 26th Feb 2018, 6:22 pm   #7
deliverance
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Default Re: The h-field transanalyser

A clever idea and beautifully made.
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Old 24th Mar 2018, 11:31 pm   #8
Philips210
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Default Re: The h-field transanalyser

That's an excellent piece of kit and very clearly documented. The frequency readout being very useful. When I can find the time, I'll try to build this circuit but I already have a multitude of other projects in the pipeline. Time is the biggest problem these days and it seems to fly by quicker as we get older.

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Symon.
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