< The VRF2933 is rated "3:1 Load VSWR Capability at Specifi ed Operating Conditions" according to its datasheet; perhaps that's why there no built-in ATU.>
.....but that doesn't mean SSB IMD would be acceptable, or it would be safe in every circuit at that mismatch, so keep that in mind. :-) No matter what the data sheets say about device life, the PA often needs to be kept within 1.5:1 or better SWR to meet IMD specs. 3:1 is a huge loadline move, depending on the direction of the impedance move it could really put the PA into severe flattopping. Use a tuner or fix the antenna, be safe. 73 Tom On Sat, Apr 17, 2010 at 6:44 PM, Doug Faunt N6TQS +1-510-655-8604 <[email protected]> wrote: > There are two VRF2933's in push-pull, so they're not 750 > watts each, > but per pair. There are only three amps in existance, and > no devices have > been destroyed (yet). Again, 500 watts is a very > conservative rating. > It's been key-down for 10 minutes withy no problems. > > 73, doug > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: A known bad url was replaced by VIPRE > Please help support this email list: A known bad url was > replaced by VIPRE > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: A known bad url was replaced by VIPRE Please help support this email list: A known bad url was replaced by VIPRE ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
