Several months ago, during the Central States VHF Conference I agreed to
take on the project which had been started in early 2005.
At this time I have just ordered the Alpha Prototype boards and
anticipate that all will be well and I can begin ordering parts for the
UCB kit.
My question is how
Hulen and others,
First thanks thanks for the many PDF conversion suggestions I have received
both personally and on the reflector from many of you. Several both Eric and
I have tried before, some are new to us and Eric will be trying out.
I do not have Word on my machine here and work on my XY
Some of you made a wonderful suggestion: publish the schematic. So
sorry I didn't think of it.
Here is a link to the schematic: http://k3tuf.com/ucb_10_17_06.pdf
I want to thank Terry W0VB, Bob N4HY, Mike KM0T as well as Eric and John
from Flex for their assistance with this project.
Phil K3TU
properly?
Any finally, what is the relationship between the Mode Specific VOX control
and the VOX setup menu under the transmit tab?
Thanks and 73, Bob
KW4CQ
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e the same problem.
Roy w9qm
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rams have the same
> problem.
> Roy w9qm
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All right! Progress at hand.
I suggest a back diode across K17 coil and a series diode on the 13.8 V
power input for those of us who have the bad habit of using the same
color wire for + and - DC feeds. Also a bit of bypassing on the PTT
input lines.
Onward.
73, Larry K2LT
Philip Theis wrot
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The darlington diode doesn't protect against a high plus voltage at the
collector. The collapsing magnetic field in the K17 relay coil at
turnoff produces a reverse polarity pulse across the coil which turns
out to be a big positive voltage at the collector. ( I think)
Larry K2LT
Philip The
If U10 and U11 are ULA2003 driver chips then they have the anode of a
diode at each output. All the cathodes are connected to the CD pin 10
which is then wired to the plus side of the relay coil supply. This
puts a back diode across each coil.
When I first started to use my SDR-1000 with my D
the Mode Specific VOX control
> and the VOX setup menu under the transmit tab?
>
> Thanks and 73, Bob
> KW4CQ
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At 08:19 AM 11/9/2006, Larry Taft wrote:
>The darlington diode doesn't protect against a high plus voltage at the
>collector. The collapsing magnetic field in the K17 relay coil at
>turnoff produces a reverse polarity pulse across the coil which turns
>out to be a big positive voltage at the colle
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> designed to tolerate the breakdown (the latter is particularly common
> in electronic ignitions, where you have a 400 V transient to deal with).
>
>
>
> Jim, W6RMK
>
>
>
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Larry, the driver chips are ULN2803 with 8 devices per chip and better
protection. The ULN200x only have 7.
Phil K3TUF FN10we
http://k3tuf.com/ucb_10_17_06.pdf
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The ERLINK-SR software is now posted at
http://myweb.tiscali.co.uk/g3ukb/ . The site is also updated with more
information. I stress this is early alpha. From previous experience I
know there will be a number of deployment issues and a fair bit of
required knowledge that I probably have omitted fro
;
>>Jim, W6RMK
>>
>>
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875
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Jim Lux wrote:
> At 10:48 AM 11/9/2006, Larry Taft wrote:
>> *GOOD FIND!*
>>
>> I spoke to Mack, the "Old Dog" here ( he is fast approaching 12 ) and
>> he woofed that Jim has taught us a new trick.
>>
>> So, if my quick read of the Tyco notes is good, a 24 volt Zener
>> should be used in series
This is SDR related for programmers.
I wanted so much to be like Bob G3UKB
Now I realize I was dreaming ;-)
four Python books,
Python Programming - absolute beginner with CD
Beginning Python from Novice to Professional
Beginning Python (with coffee stains)
Python Programming on
, or should I
start looking at something here in the local SDR set up??
-Dan
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