General Coverage Rx Jan/Feb '99

The radio-active topic

Postby tech45leg » Mon Sep 02, 2013 12:00 am

I decided to have a go at building this oldie!

I had a little trouble finding the parts, but building is going well.

Dave.
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036-Blue-coil-fitted-.JPG
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Postby auwecswqkiu » Mon Sep 02, 2013 12:00 am

Hi,

Where did you find the part YMCS17105R2 (toko) ? Please keep us in the loop on how the project is progressing.

Regards
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Postby tech45leg » Tue Sep 03, 2013 12:00 am

Hi,

I ordered most of the parts from Barend Hendriksen http://www.barendh.com and also from http://www.rfmicrowave.it.

I assume youre talking about L19? I think that one came from Barend - he did replace a lot of the coils with equivalents. The fixed inductors were sourced from America because I wanted to keep the cool blue theme (something I try to do in a lot of my projects). The blue coil was hand-wound from blue enameled silver plated copper wire available from http://wires.co.uk/acatalog/colouredcraftwires.html.

Ill post more photos tonight - I have installed all the blue inductors and the ICs now. By the way, LittleDiode is a good source for the out-of-date ICs, transistors, and of course diodes!

Dave
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Postby tech45leg » Tue Sep 03, 2013 12:00 am

Update...

Here's a photo of some of the special parts...

The orange SFR455J came from rfmicrowave of Italy - I ordered 5 or 6 of them just in case I need some in the future for other projects. Pity it's not blue or black though - it kind of spoils the theme - ha ha!

L19 is at the top right (45606/93299).

Dave.
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019-Coils--crystals-and-filters.JPG
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Postby tech45leg » Tue Sep 03, 2013 12:00 am

Update...2!

Here's the front-panel board:

I know, I know! The meter is all wrong - a new one is on order. I had to cut and file the hole for the meter, it's a bit rough at the moment, but I'll correct that before it goes into the case

The blue enamelled wires are made from the same stuff that I used to make the blue coil on the main board. Theyre silver-plated copper. I am upgrading the PIC processor to a PIC16F88 and the display will have 2 lines instead of 1. The display will be white characters on a blue background. The orginal code was never available and obviously there are no pre-programmed PICs left, so I have to do a bit of reverse engineering to make the radio work. So far, I have the encoder, keypad and display working, and I can send serial data to the PLL (Phase-Locked Loop). However, I need to write code to generate the correct division values based on the chosen frequency.

I'll keep you all posted on progress. If anyone has any code questions, just ask.

Dave.'
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039-Front-PCB.JPG
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Postby tech45leg » Thu Sep 05, 2013 12:00 am

Update 3...

These forums seem to be a little quiet! I'd have thought that Elektor would have more members on here - never mind!

Here's the latest photo of the build for those following...

Dave.
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P1010387.1.JPG
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Postby thijsbeckers » Thu Sep 05, 2013 12:00 am

Well... this project is almost 15 years old after all...

But it looks really nice. You did a great job! The blue theme is a nice touch.
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Postby auwecswqkiu » Fri Sep 06, 2013 12:00 am

So the big question is does it receive SW stations. I had built this radio in 2003 but couldn't receive anything. I am planning on building it again.
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Postby auwecswqkiu » Sat Sep 07, 2013 12:00 am

I still have the old PIC16f84 with me. But unfortunately I stay far away from home in the US.
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Postby tech45leg » Tue Sep 10, 2013 12:00 am

auwecswqkiuSo the big question is does it receive SW stations. I had built this radio in 2003 but couldn't receive anything. I am planning on building it again.


I haven't finished programming the PIC yet, and there are a few missing parts to buy Ill let you know when it starts to work...'
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