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Activity within 7 days:

2 New Members - 31 New Messages - New Questions

Description

This group
http://groups.yahoo.com/group/N2PK-VNA
supports the build and use of the N2PK
Vector Network Analyzer (VNA). A detailed
desciption of this VNA can be found at:

http://n2pk.com

N2PK will try to respond to queries as time
permits, but this group is intended to be an
open forum where all members will hopefully
feel free to participate with questions and
answers.

The N2PK VNA by Christer (SM6PXJ) and
Hans (SM0CFO), shown in the photo here,
is an example of homebrew construction at
its finest.

Most Recent Messages

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ADC overflow
Hi Paul, Hi Ivan, Hi 'Paul', I repeated the calibration process, and found no problem. I can now close the file. Thank you for your help and compliments. I
Posted - Fri Feb 10, 2012 11:26 pm
 suzuki_masaya
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Re: ADC overflow
Congratulation Masaya de Paul, W8AEF ZF2JI/ZF2TA 8Q7AA FO8DX/FO0PLA XZ0A VU7RG/VU3PYM TX5A A52PP ... From: suzuki_masaya Sent: Friday, February 10, 2012 6:46
Posted - Fri Feb 10, 2012 5:41 pm
 Paul
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ADC overflow
Hi Paul, Hi Ivan, Way out found!!! (I believe) 1) I removed U210, but current through R280 didn't improve. 2) So I replaced C292, C280, and C281 successively.
Posted - Fri Feb 10, 2012 1:46 pm
 suzuki_masaya
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Re: ADC overflow
Hi Masaya, ... There is nothing that can happen under software control that would cause the detector collector common mode voltage to rise or change in any
Posted - Fri Feb 10, 2012 1:03 pm
 Paul Kiciak
n2pk2001
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ADC overflow
Hi Paul, ... Yes I did quite a few times. When I do the voltage measuring without connection to PC, all voltages measured including negative bias voltage are
Posted - Fri Feb 10, 2012 12:33 pm
 suzuki_masaya
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2012 57 81
2011 56 82 63 27 62 21 15 39 57 10 14 130
2010 135 64 56 45 71 24 49 137 192 95 128 61
2009 182 105 47 25 40 60 32 51 62 163 83 118
2008 98 35 109 132 100 114 172 93 111 126 118 142
2007 27 41 79 73 62 14 53 37 69 148 48 94
2006 145 76 115 122 174 99 34 36 18 59 86 69
2005 57 84 103 149 58 13 23 55 66 86 342 153
2004 3 2 19 8 11 19 39
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