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Author Topic: Tiny 80m Transciever  (Read 2579 times)
KB2VMA
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Posts: 16




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« on: October 29, 2008, 08:18:41 PM »

I would like to design a tiny transceiver that will fit roughly in a 1/2 to 3/4 inch square by 3 inch form factor to try and add to a survival kit.  I figure that skywave might work in a pinch, and I think it would be an interesting challenge.  any ideas?  I think that cw should be sufficient.  I was thinking a rca connector on one side, a earpiece on the other, and a metal strap as a straight key with 3 lithium batteries as power.  Do you think the pixie II transmitter can be squeezed in there?
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VK2HHS
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Posts: 30




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« Reply #1 on: October 29, 2008, 09:16:01 PM »

These one springs to mind, although looking at it again shows it to be DSB instead of CW

www.qrp.pops.net/willy.asp

One of my ARRL handbooks either 79 or 85 has a small transmitter called the "Cubic Incher".  A google search turns up quite a few kits and other sites.

In the mean time, I found this.  Its for 40m but may be OK to convert for 80m!

www.ea3fxf.googlepages.com/SPRAT-FLEA.doc

Enjoy!

de VK2HHS
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VK2HHS
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Posts: 30




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« Reply #2 on: October 29, 2008, 09:28:50 PM »

These one springs to mind, although looking at it again shows it to be DSB instead of CW

www.qrp.pops.net/willy.asp

One of my ARRL handbooks either 79 or 85 has a small transmitter called the "Cubic Incher".  A google search turns up quite a few kits and other sites.

In the mean time, I found this.  Its for 40m but may be OK to convert for 80m!

www.ea3fxf.googlepages.com/SPRAT-FLEA.doc

Enjoy!

de VK2HHS
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W5FYI
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Posts: 1044




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« Reply #3 on: October 30, 2008, 04:17:41 AM »

Steve Weber, an avid trail hiker, has designed several QRP rigs that fit in Altoids mint tins, but they may be too big for your requirements. However, they are multiband and are rated close to 5 watts, which is something I would want in an emergency radio. If interested, consider his ATS transceiver. Also, some time back, a ham built a tiny rig inside of a 9-volt battery case, and Dave Ingram, who writes for CQ magazine, built a transmitter inside a rather thick ball-point pen. Both, I think, are truly "flea power," and it would be foolish to think they would be very reliable for emergency use, but they are small. The "Cubic Incher" transmitter is probably closest to your size requirements, and it can deliver several watts. I think the Sprat "flea" is a low-power transceiver derived from the cubic incher design, but its output is rather low~around 10 mW, I think. Good luck.
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WB6BYU
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Posts: 13026




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« Reply #4 on: October 30, 2008, 10:28:23 AM »

There was a surface mount version of the Pixie called the
"SMite"(?) that was about the size of a credit card, and
perhaps 1/4" thick at the most.  If I recall it would fit
in an Altoids box with enough room left for a 9V battery,
and the parts were pretty sparse on the board.  With
a well-designed board and SMD parts you should be able to
get quite a bit of circuitry in the available space.  The
main limitation will be the controls, connectors and
battery.  (5W isn't very practical from a 9V battery!)
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VA7AAX
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Posts: 34


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« Reply #5 on: October 30, 2008, 03:58:57 PM »

I think the ATS3B (by Kd1JV) is your best option. It is a surface mount kit. puts out legal limit QRP(!) and it is basically a top end qrp transceiver . It also does digital. If you are beginning in Construction, the kit is not recommended.

http://kd1jv.qrpradio.com/ATS3B/ats3b.HTM
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N3OX
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« Reply #6 on: November 02, 2008, 03:05:12 PM »

they back in stock yet?  I do kind of want one...
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
VA7AAX
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« Reply #7 on: November 04, 2008, 03:44:46 PM »

Last I checked , no. But he plans to have them in December 2008
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W5FYI
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Posts: 1044




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« Reply #8 on: November 05, 2008, 02:46:52 PM »

RV3GM has put a simple 80-meter transceiver inside an Altoids tin, and claims 700 mW output. The tiny rig, still larger than your requirements, operates on only two transistors and an audio IC plus about 22 other passive components. He calls it the AltAir, for Altoids on the Air.

Also look at http://py2ohh.w2c.com.br/trx/curumim/curumim.htm. It might not be ideal for an emergency radio, but seems to be quite small.
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W8ZNX
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Posts: 1




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« Reply #9 on: November 09, 2008, 01:22:39 PM »

look at the larger cw monoband qrp kits

check the qrp web sites
please note
a super small 80 meter xceiver
is still going to need an antenna, battery power,
ear phones, a telegraph key,

trying to fit a useable radio
and the things it needs
in to your space requirment
is not going to work

dit dit
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WB8YYY
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Posts: 159


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« Reply #10 on: November 10, 2008, 09:57:55 AM »

Definitely make it useful for real communication -- on 80m having capability to radiate at least 5w seems worthwhile, with ability to further QRP desirable to stretch the batteries.  

I would consider the SW-series design (from small wonder labs) and see how small using mostly surface mount will take it.  Yes considering a single band version of the ATS rig that was suggested will give you a data point on how small you can get.  

As sunspots rise, 40m would become a tempting option with its reduced QRN.  

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US2IAV
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Posts: 6




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« Reply #11 on: November 30, 2008, 11:21:47 PM »

And another project, design of KX-1 and ATS-3b
http://pocket-trx.narod.ru/datasheet/shema/25.11.08.pdf
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