<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt">Hello Ken,<br><br>The plate choke in the SB-230 is the same as the one in the SB-200, part #45-61, 50uH. Since it doesn't cause a problem in the 200 I believe I will be safe.<br><br>Thanks<br><br>Allen, W9DZ<br><div><span><br></span></div><div style="display: block;" class="yahoo_quoted"> <br> <br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> On Wednesday, November 13, 2013 11:12 AM, Kenneth G. Gordon <kgordon2006@frontier.com> wrote:<br> </font> </div> <blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px;
margin-top: 5px; padding-left: 5px;"> <div class="y_msg_container">On 12 Nov 2013 at 20:33, Allen Jones wrote:<div class="yqt4904770384" id="yqtfd38209"><br clear="none"><br clear="none">> Is it safe to use the SB-230 on 17 and 12 Meters? I know some pre<br clear="none">> WARC amps have plate chokes that are resonant on one or both of those<br clear="none">> bands.</div><br clear="none"><br clear="none">Hmmm....that is a very good question!<br clear="none"><br clear="none">The only information I can provide for you is that my own SB-200 works just<br clear="none">fine on those two bands.<br clear="none"><br clear="none">17 meters works with the bandswitch on 15, and 12 meters with the<br clear="none">bandswitch on 10.<br clear="none"><br clear="none">Power output and tune-up procedures are the same as those for the<br clear="none">non-WARC bands.<br clear="none"><br clear="none">Could you remove the plate RF choke, short the ends
together, and check<br clear="none">for resonances with a GDO? Doing that would find any resonances within<br clear="none">ham bands.<br clear="none"><br clear="none">Kenneth G. Gordon W7EKB<br clear="none"><br clear="none">"Courage is being scared to death but saddling up anyway."--- John Wayne<div class="yqt4904770384" id="yqtfd55242"><br clear="none"></div><br><br></div> </blockquote> </div> </div> </div> </div></body></html>