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Old October 30th 07, 04:32 PM posted to rec.radio.amateur.homebrew
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Default ARRL Homebrew Challenge


"Scott" wrote in message
.. .
Surface mount stuff is fine. I use them all the time in my transverters
(VHF-microwave) and my other homebrew stuff. OK on your 160-10 homebrew.
My example (my Yaesu FT857 is what I had in mind) covers that PLUS 6, 2
and 432. How much would it cost to add those to your radio? Probably not
too much, but it might still get you close to the $700 Yaesu. And, yours
is not counting labor costs. How many hours did it take to build? When I
build, I "pay" myself at $20/hours...less than that and I stay in bed!
I know it's a hobby, but even if I don't count my labor costs, it uses up
my time where I COULD be making $20/hour. Don't get me wrong, I still
love to build stuff!!!

Scott
N0EDV


That's funny Scott. I put $20 an hour into a coffee can when I design/build
a project. Figure I couldn't have more fun if I paid that much for it. About
every 3 years, there's enough there for a 3-4 week vacation in the UK.

With Bush spending money we don't have like a drunken sailor, the dollar is
in the tank everywhere so it may be 4 years this time. Either that or I have
to build more stuff.

W4ZCB


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Old October 30th 07, 05:58 PM posted to rec.radio.amateur.homebrew
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Default ARRL Homebrew Challenge

I'm one of the 4 who submitted an entry to the ARRL HBC contest. I
figure I put maybe 500 to 600 hours into the project. I had relocated
in February to take a new job, and my family wasn't able to join me
until July. Consequently, I had the time on my hands anyway.

This may seem like a lot of time, but when you consider the average
American spends that much time watching TV in four months, I don't
feel too bad.

I consider it time well spent. I learned a lot that I will be able to
use on future projects. I'm sure that the other contest participants
would agree.

73 - Dave NM0S

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Old October 30th 07, 06:59 PM posted to rec.radio.amateur.homebrew
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Default ARRL Homebrew Challenge

NM0S wrote:
I'm one of the 4 who submitted an entry to the ARRL HBC contest.


Feel free to brag here in further detail.

--
One meter, to within 0.0125% accuracy (off by just under .005 inches):
Three feet
Three inches
Three eights of an inch
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Old October 31st 07, 03:25 AM posted to rec.radio.amateur.homebrew
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Default ARRL Homebrew Challenge

On Oct 30, 1:59 pm, clifto wrote:
NM0S wrote:
I'm one of the 4 who submitted an entry to the ARRL HBC contest.


Feel free to brag here in further detail.


OK, don't mind if I do. Basically, my design is a direct-conversion
rig, with a Class-E PA running about 90% efficiency DC-RF (CW anyway),
delivering 5 to 6W PEP. Finals are push-pull 2N7000 MOSFETS, directly
driven by a 74HC86 logic gate. VFO is a PTO covering the full 40M
band. Voice mode is Double-sideband, suppressed carrier. There is
an AGC on the receive, and ALC on transmit, so there is only one
knob, for tuning. The receiver uses the PA MOSFETS as the receive
mixer. The audio amp is discrete transistor design, with automatic
bias control to reduce current consumption when no signals are
received. Total current draw on RX is 30mA, on TX 600mA. There is
a 200 Hz CW filter that is switched in when a key is plugged into the
KEY jack. Total parts cost, including enclosure and PCB is $40. Will
work from 9V with reduced power.

ICs used a LM324, LM3900, LM339, 74HC86 and 78L05

I'll make boards available if there is interest.

73 - Dave NM0S

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Old October 30th 07, 06:54 PM posted to rec.radio.amateur.homebrew
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Default ARRL Homebrew Challenge

Harold E. Johnson wrote:
With Bush spending money we don't have like a drunken sailor, the dollar is
in the tank everywhere so it may be 4 years this time. Either that or I have
to build more stuff.


Bush isn't spending it, it's the damned Congress.

--
One meter, to within 0.0125% accuracy (off by just under .005 inches):
Three feet
Three inches
Three eights of an inch


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Old October 31st 07, 11:19 AM posted to rec.radio.amateur.homebrew
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Posts: 162
Default ARRL Homebrew Challenge

I hear ya, man! My problem exactly! I can still afford to build
microwave gear but I can't afford the drive to get to one of the better
sites around here (about 6 hours away from me)

Scott
N0EDV

Harold E. Johnson wrote:
"Scott" wrote in message
.. .

Surface mount stuff is fine. I use them all the time in my transverters
(VHF-microwave) and my other homebrew stuff. OK on your 160-10 homebrew.
My example (my Yaesu FT857 is what I had in mind) covers that PLUS 6, 2
and 432. How much would it cost to add those to your radio? Probably not
too much, but it might still get you close to the $700 Yaesu. And, yours
is not counting labor costs. How many hours did it take to build? When I
build, I "pay" myself at $20/hours...less than that and I stay in bed!
I know it's a hobby, but even if I don't count my labor costs, it uses up
my time where I COULD be making $20/hour. Don't get me wrong, I still
love to build stuff!!!

Scott
N0EDV



That's funny Scott. I put $20 an hour into a coffee can when I design/build
a project. Figure I couldn't have more fun if I paid that much for it. About
every 3 years, there's enough there for a 3-4 week vacation in the UK.

With Bush spending money we don't have like a drunken sailor, the dollar is
in the tank everywhere so it may be 4 years this time. Either that or I have
to build more stuff.

W4ZCB



--
Scott
http://corbenflyer.tripod.com/
Gotta Fly or Gonna Die
Building RV-4 (Super Slow Build Version)
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