Re: knq7a bias current

Ronald Hering
 

I did some more checking and changed the 510, the gate voltage goes to 2.2 volts on keying and the drain drops to around 10 volts all other voltages arereal close to the chart.
--------------------------------------------

On Sat, 10/21/17, Adam Rong rongxh@... [CHINA_QRP] <CHINA_QRP@...> wrote:

Subject: Re: [CHINA_QRP] knq7a bias current
To: CHINA_QRP@...
Date: Saturday, October 21, 2017, 10:40 AM


 












Ron,



Have you observed very hot parts during transmission?
Besides the
trimmer position, please check if you have properly
installed the
insulators for BD139/D882 and IRF510.



Thanks,

Adam



于 2017-10-21 23:28, rhering6938@...
[CHINA_QRP] 写道:



 


Hi All,

Finally getting around to finishing my knq7,
but ran into
a problem.

 The idle current is around 40 ma but when
PTT is keyed it
jumps up to around 1400ma at the low end. Any
ideas on
where to start looking? All help will be
greatly
appreciated. Thanks, Ron.
























#yiv0969315839 #yiv0969315839 --
#yiv0969315839ygrp-mkp {
border:1px solid #d8d8d8;font-family:Arial;margin:10px
0;padding:0 10px;}

#yiv0969315839 #yiv0969315839ygrp-mkp hr {
border:1px solid #d8d8d8;}

#yiv0969315839 #yiv0969315839ygrp-mkp #yiv0969315839hd {
color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px
0;}

#yiv0969315839 #yiv0969315839ygrp-mkp #yiv0969315839ads {
margin-bottom:10px;}

#yiv0969315839 #yiv0969315839ygrp-mkp .yiv0969315839ad {
padding:0 0;}

#yiv0969315839 #yiv0969315839ygrp-mkp .yiv0969315839ad p {
margin:0;}

#yiv0969315839 #yiv0969315839ygrp-mkp .yiv0969315839ad a {
color:#0000ff;text-decoration:none;}
#yiv0969315839 #yiv0969315839ygrp-sponsor
#yiv0969315839ygrp-lc {
font-family:Arial;}

#yiv0969315839 #yiv0969315839ygrp-sponsor
#yiv0969315839ygrp-lc #yiv0969315839hd {
margin:10px
0px;font-weight:700;font-size:78%;line-height:122%;}

#yiv0969315839 #yiv0969315839ygrp-sponsor
#yiv0969315839ygrp-lc .yiv0969315839ad {
margin-bottom:10px;padding:0 0;}

#yiv0969315839 #yiv0969315839actions {
font-family:Verdana;font-size:11px;padding:10px 0;}

#yiv0969315839 #yiv0969315839activity {
background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}

#yiv0969315839 #yiv0969315839activity span {
font-weight:700;}

#yiv0969315839 #yiv0969315839activity span:first-child {
text-transform:uppercase;}

#yiv0969315839 #yiv0969315839activity span a {
color:#5085b6;text-decoration:none;}

#yiv0969315839 #yiv0969315839activity span span {
color:#ff7900;}

#yiv0969315839 #yiv0969315839activity span
.yiv0969315839underline {
text-decoration:underline;}

#yiv0969315839 .yiv0969315839attach {
clear:both;display:table;font-family:Arial;font-size:12px;padding:10px
0;width:400px;}

#yiv0969315839 .yiv0969315839attach div a {
text-decoration:none;}

#yiv0969315839 .yiv0969315839attach img {
border:none;padding-right:5px;}

#yiv0969315839 .yiv0969315839attach label {
display:block;margin-bottom:5px;}

#yiv0969315839 .yiv0969315839attach label a {
text-decoration:none;}

#yiv0969315839 blockquote {
margin:0 0 0 4px;}

#yiv0969315839 .yiv0969315839bold {
font-family:Arial;font-size:13px;font-weight:700;}

#yiv0969315839 .yiv0969315839bold a {
text-decoration:none;}

#yiv0969315839 dd.yiv0969315839last p a {
font-family:Verdana;font-weight:700;}

#yiv0969315839 dd.yiv0969315839last p span {
margin-right:10px;font-family:Verdana;font-weight:700;}

#yiv0969315839 dd.yiv0969315839last p
span.yiv0969315839yshortcuts {
margin-right:0;}

#yiv0969315839 div.yiv0969315839attach-table div div a {
text-decoration:none;}

#yiv0969315839 div.yiv0969315839attach-table {
width:400px;}

#yiv0969315839 div.yiv0969315839file-title a, #yiv0969315839
div.yiv0969315839file-title a:active, #yiv0969315839
div.yiv0969315839file-title a:hover, #yiv0969315839
div.yiv0969315839file-title a:visited {
text-decoration:none;}

#yiv0969315839 div.yiv0969315839photo-title a,
#yiv0969315839 div.yiv0969315839photo-title a:active,
#yiv0969315839 div.yiv0969315839photo-title a:hover,
#yiv0969315839 div.yiv0969315839photo-title a:visited {
text-decoration:none;}

#yiv0969315839 div#yiv0969315839ygrp-mlmsg
#yiv0969315839ygrp-msg p a span.yiv0969315839yshortcuts {
font-family:Verdana;font-size:10px;font-weight:normal;}

#yiv0969315839 .yiv0969315839green {
color:#628c2a;}

#yiv0969315839 .yiv0969315839MsoNormal {
margin:0 0 0 0;}

#yiv0969315839 o {
font-size:0;}

#yiv0969315839 #yiv0969315839photos div {
float:left;width:72px;}

#yiv0969315839 #yiv0969315839photos div div {
border:1px solid
#666666;min-height:62px;overflow:hidden;width:62px;}

#yiv0969315839 #yiv0969315839photos div label {
color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}

#yiv0969315839 #yiv0969315839reco-category {
font-size:77%;}

#yiv0969315839 #yiv0969315839reco-desc {
font-size:77%;}

#yiv0969315839 .yiv0969315839replbq {
margin:4px;}

#yiv0969315839 #yiv0969315839ygrp-actbar div a:first-child {
margin-right:2px;padding-right:5px;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg {
font-size:13px;font-family:Arial, helvetica, clean,
sans-serif;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg table {
font-size:inherit;font:100%;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg select,
#yiv0969315839 input, #yiv0969315839 textarea {
font:99% Arial, Helvetica, clean, sans-serif;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg pre, #yiv0969315839
code {
font:115% monospace;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg * {
line-height:1.22em;}

#yiv0969315839 #yiv0969315839ygrp-mlmsg #yiv0969315839logo {
padding-bottom:10px;}


#yiv0969315839 #yiv0969315839ygrp-msg p a {
font-family:Verdana;}

#yiv0969315839 #yiv0969315839ygrp-msg
p#yiv0969315839attach-count span {
color:#1E66AE;font-weight:700;}

#yiv0969315839 #yiv0969315839ygrp-reco
#yiv0969315839reco-head {
color:#ff7900;font-weight:700;}

#yiv0969315839 #yiv0969315839ygrp-reco {
margin-bottom:20px;padding:0px;}

#yiv0969315839 #yiv0969315839ygrp-sponsor #yiv0969315839ov
li a {
font-size:130%;text-decoration:none;}

#yiv0969315839 #yiv0969315839ygrp-sponsor #yiv0969315839ov
li {
font-size:77%;list-style-type:square;padding:6px 0;}

#yiv0969315839 #yiv0969315839ygrp-sponsor #yiv0969315839ov
ul {
margin:0;padding:0 0 0 8px;}

#yiv0969315839 #yiv0969315839ygrp-text {
font-family:Georgia;}

#yiv0969315839 #yiv0969315839ygrp-text p {
margin:0 0 1em 0;}

#yiv0969315839 #yiv0969315839ygrp-text tt {
font-size:120%;}

#yiv0969315839 #yiv0969315839ygrp-vital ul li:last-child {
border-right:none !important;
}
#yiv0969315839

Join crkits@groups.io to automatically receive all group messages.