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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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16th Apr 2010, 6:18 pm | #1 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,038
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My 80 metre rig
Not vintage (unless you count the FT790 case it's built in). A few weeks of highly enjoyable home construction produced this little single-band transceiver. I'm very impressed with the kit-built Si570 digital VFO.
http://g1hbe.webs.com/the80mproject.htm
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Andy G1HBE. |
16th Apr 2010, 9:29 pm | #2 |
Hexode
Join Date: Feb 2007
Location: Near Lichfield, Staffordshire, UK, most of the time and Crystal Palace, S London, some of the time..
Posts: 330
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Re: My 80 metre rig
Nice...!
Ian (G8KSZ) |
16th Apr 2010, 10:06 pm | #3 |
Rest in Peace
Join Date: Aug 2009
Location: East Preston, Sussex
Posts: 162
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Re: My 80 metre rig
Very impressed.
How about a circuit? Mike |
16th Apr 2010, 10:15 pm | #4 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,038
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Re: My 80 metre rig
Thanks both.
There is no 'written down' cct, but I'll be sticking a block diagram on the website ASAIGATI... It's very straightforward, just a single conversion superhet with an IF of 9 MHz. I'm astonished by the PA0KLT 'digital VFO' kit - it's not a DDS or a PLL, it's er...something else, apparently based on one or more 'pullable' xtal oscs and a bank of dividers, all under software control and a 32-bit frequency word. Apparently it doesn't suffer from the spurs that tends to blight some DDS designs.
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Andy G1HBE. |
17th Apr 2010, 7:54 am | #5 |
Rest in Peace
Join Date: Aug 2009
Location: East Preston, Sussex
Posts: 162
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Re: My 80 metre rig
Andy,
Thanks for the reply. I have a "Plessey" IF unit with a 10.7 IF which was the rage many years ago. Just crying for a good VFO and front end, The PA0KLT unit looks as though it was made for the job, assuming I can get enough drive as the Plessey uses a MD108 DBM. Will have to look into that. Regards Mike |
17th Apr 2010, 9:29 am | #6 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,038
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Re: My 80 metre rig
Mike,
Take a look at: http://sdr-kits.net/PAOKLT/PAOKLT.html There are three types - a CMOS one that tunes to 160 MHz with 3v p-p output (200 ohms I think), then two faster ones that reach 240 MHz and 900 MHz but with lower output. The CMOS one would certainly hammer your DBM good & proper!
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Andy G1HBE. |