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Author Topic: Any ideas for 160m QRP rig ?  (Read 2271 times)
W0OPW
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Posts: 44




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« on: September 08, 2003, 11:13:49 PM »

 I would like to build a QRP rig for 160m.  The last time I looked, there were not any kits out there that cover the band.

 Anyone have a kit idea or circuit for 160 ?

 Pat W0OPW
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N8MHD
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Posts: 11




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« Reply #1 on: September 09, 2003, 02:55:54 PM »

The Elecraft K2 does 160 m, with an added filter board.  If you're ambitious, you might take the Elecraft board and add your own receiver and transmitter.  Circuit diagrams are on their web site.

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WB6BYU
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Posts: 13353




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« Reply #2 on: September 09, 2003, 04:24:21 PM »

You can get circuit boards for the 40-40 transceiver
(and a lot of others) from FAR Circuits.  In most cases
you can just change the tuned circuit and/or crystal
frequencies to a different band.

For example, the 40-40 is similar to the SW-40 rig.
It has a tuned toriod in the receiver input, and a
couple filters in the transmitter that can be changed
to other bands.  You may also need to modify the VFO
and/or IF filters to suit the desired frequency range
and available crystals.  (I used 5.7 MHz crystals in my
40m unit - with these you would put the VFO on 3.9 or
7.5 MHz.  Or the 4.9 MHz crystals would take a VFO
around 3 MHz.)

Most of the 80 or 40m radios should be easily built for
160m instead.  One approach you might consider would be
to use the R2/T2 modules for a single signal, direct
conversion receiver - with switchable sideband on
transmit and receive if desired.  It all depends on the
features you want in your radio.
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W0OPW
Member

Posts: 44




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« Reply #3 on: September 09, 2003, 04:43:53 PM »

I forgot to add that I want to keep this simple. So, the K2 is out for now.  If anyone has a tried and true circuit, let me know.
  Pat W0OPW
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W3JJH
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Posts: 1421


WWW

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« Reply #4 on: September 11, 2003, 04:47:40 PM »

There's a nice 160-m QRP transmitter design on p. 38 of the ARRL book "Soilid State Design for the Radio Amateur."  It uses a GE D44C6 transistor for a final.  That part is obsolete but could be replaced by the ST44C6 (www.semi-tech-inc.com) or a BD135, BD137, or BD139 (www.fairchildsemi.com).
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K7VO
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Posts: 1010




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« Reply #5 on: September 12, 2003, 03:24:18 PM »

Hi, Pat,

Have you looked at the ARRL book, "Low Power Scrapbook"?  There are a number of possibilities there, and some of the 80m designs should be adaptable to 160m.

72,
Caity
K7VO
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K8KAS
Member

Posts: 569




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« Reply #6 on: September 12, 2003, 04:41:51 PM »

A 4-1000 with 6KV on the plate and nice old Johnson Ranger for a driver. A good 1/4 wave vert. antenna with a mile of ground system should do it.
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W0OPW
Member

Posts: 44




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« Reply #7 on: September 15, 2003, 05:53:46 PM »

The 4-1000 sounds nice but Rangers are a bit scarce these days.  
 My needs are to compete in the next ARRL 160 conteest but with  low power for the mults.  I have a nice competitive antenna for the band so think that with QRP I could get a fairly nice score.  At 100 watts, there are some stations in my region that will always bust me, so QRP may be the means.

  It's too bad there is no kit out there anymore

 Pat W0OPW
 

 
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WB6BYU
Member

Posts: 13353




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« Reply #8 on: September 16, 2003, 04:00:42 PM »

Call Small Wonder Labs and ask them if they can provide
a SW-160+ kit (or a conversion kit for one of the 80m
or 40m versions.)

Or just run a standard 100W rig at reduced power output.
I run my TS-450 this way all the time.  Just cut back
the CW Drive to the desired power level.  (You can also
set the AGC at this level on most rigs if desired.)

Though a Central Electronics 10A might work, too...
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WD4MKQ
Member

Posts: 21




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« Reply #9 on: September 23, 2003, 12:06:02 PM »

there's an article on 160m QRP in this month's CQ magazine.  Nothing about construction, but rather more about operating.  It's not a great article, but you might find it interesting!


--steve
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W1FMR
Member

Posts: 7




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« Reply #10 on: September 27, 2003, 02:50:34 PM »

You might try a Wilderness (4 Watt) Sierra CW transceiver kit...

If they still sell them ...

It uses plug-in band modules. I have used mine on 160m with good success....

Jim - W1FMR
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