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MFJ originally listed the 989C as a 3000 watt tuner. They took a little heat over that. I have a friend that poofed his 962D with an 811H. Turned out to be bad SWR due to a coax jumper. Gotta watch those meters... I had an issue with my coax recently, but thankfully caught it before anything popped. SWR was jumping all over the place.

Follow the tuning instructions (low power to find your match, then tune the amp, then increase your output), and I don't think anyone has mentioned... don't switch your antenna/dummy load switch while transmitting. Unkey, move the switch, then key again. I have heard many stories of guys that say they blew a wafer switch by goofing up this way.

73,
Brett

<blockquote data-quote="2RT307" data-source="post: 515567" data-attributes="member: 22879">MFJ originally listed the 989C as a 3000 watt tuner.&nbsp; They took a little heat over that.&nbsp; <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink&nbsp; &nbsp; ;)"&nbsp; data-smilie="2"data-shortname=";)" />&nbsp; I have a friend that poofed his 962D with an 811H.&nbsp; Turned out to be bad SWR due to a coax jumper.&nbsp; Gotta watch those meters... I had an issue with my coax recently, but thankfully caught it before anything popped.&nbsp; SWR was jumping all over the place.&nbsp;Follow the tuning instructions (low power to find your match, then tune the amp, then increase your output), and&nbsp; I don&#039;t think anyone has mentioned... don&#039;t switch your antenna/dummy load switch while transmitting.&nbsp; Unkey, move the switch, then key again.&nbsp; I have heard many stories of guys that say they blew a wafer switch by goofing up this way.&nbsp;73,Brett</blockquote>

[QUOTE="2RT307, post: 515567, member: 22879"] MFJ originally listed the 989C as a 3000 watt tuner. They took a little heat over that. ;) I have a friend that poofed his 962D with an 811H. Turned out to be bad SWR due to a coax jumper. Gotta watch those meters... I had an issue with my coax recently, but thankfully caught it before anything popped. SWR was jumping all over the place. Follow the tuning instructions (low power to find your match, then tune the amp, then increase your output), and I don't think anyone has mentioned... don't switch your antenna/dummy load switch while transmitting. Unkey, move the switch, then key again. I have heard many stories of guys that say they blew a wafer switch by goofing up this way. 73, Brett [/QUOTE]

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