Mike, Good deal.
I will tell you that we've worked with those power modules before and they provide good power, but it is not particularly consistent power. If you are looking at using a module to drive a PA, I think you will be disappointed because power control is difficult. If you are using a multi-module PA that may vary in output power some with heat/voltage/etc and it's you ultimate output device I think you are fine. Steve, N2CEI, at DEMI can give you similar info and more specific to his designs. He may have solved some of these problems with the modules. Steve Steve Stephen Hicks, N5AC VP Engineering FlexRadio Systems™ 4616 W Howard Ln Ste 1-150 Austin, TX 78728 Phone: 512-535-4713 x205 Email: [email protected] Web: www.flexradio.com Click Here for PGP Public Key<https://sites.google.com/a/flex-radio.com/pgp-public-keys/n5ac> *Tune In Excitement™* PowerSDR™ is a trademark of FlexRadio Systems On Tue, Jul 16, 2013 at 2:28 PM, Mike Valentine <[email protected]> wrote: > Steve, > > Thanks so much for the "official" output power specification for he 6700 > on 2 meters!!! > > Another of your customers relayed similar info, but I like the feel of > guaranteed minimums instead of a range. > > If I can count on +5 dBm, then it changes the ball game a bit. I notice > that many of the Mitsubishi MOSFET power modules have a 1-dB INPUT > compression point of around +5 dBm. That means that they might be well > suited to following the 6700 directly, without needing an inter-stage > driver device. > > With +5 dBm in mind, my new plan is to try out a Down East 2M30PA > amplifier, built around a Toshiba S-AV33, to see how it behaves with +5 dBm > of drive and evaluate its INPUT 1-dB compression point. If it proves > un-worthy of my aspirations for it, it seems well suited to serve as an > experimental vehicle for substituting various Mitsubishi MOSFET power > modules to see how they behave. There is a new RA80H1415M1 module that has > 39 dB of gain (1-dB compressed) at +5 dBm. That gives +44 dBm, or about 25 > Watts of output from an ostensibly 80 Watt device. Since the 6700 won't > drive it much harder, it should be thermally safe to substitute for the > S-AV33 as a direct swap. > > The Mitsu RA60H1317M has more gain, but is a 3-stage device that loses > 1-dB of gain closer to 0 dBm. It seems to put out about the same amount of > power at the 1-dB INPUT compression point as the RA80 above. > > An RA60H1317M1A is a 60W device that has 2 stages, a little less gain than > its 3-stage brother, but has a 1-dB INPUT compression point around +3 to +5 > dBm, depending on frequency. Its gain depends on frequency more than the > others. At +5 dBm it delivers 20 Watts @ 136 MHZ. The same +5 dBm > delivers 40 Watts @ 155 MHz. So, it is somewhere in between @ 144MHz -- it > needs testing. > > I sure wish Toshiba's data sheets gave the same amount of information on > gain, gain compression, and power output vs. frequency that the Mitsubishi > data sheets give. > > > I'll see what happens when I test the 2M30PA to give some direction to the > project. > > Thanks again for the transverter jack output data! > > Cheers, > > Mike - W8MM > > > On Jul 16, 2013, at 12:28 PM, "Stephen Hicks, N5AC" <[email protected] > <mailto:[email protected]>> > wrote: > > Mike, > > The TXDVGA in the radio goes into clip at around +7 to +8dBm on two > meters. More power output is available on HF -- around +16 to +17dBm. You > should be able to safely plan on always having +5dBm on two meters and this > will give you a little margin. They are not walking around by more than > 1dBm or so. > > Steve > > > Steve > > Stephen Hicks, N5AC > VP Engineering > FlexRadio Systems™ > 4616 W Howard Ln Ste 1-150 > Austin, TX 78728 > Phone: 512-535-4713 x205 > Email: [email protected]<mailto:[email protected]> > Web: www.flexradio.com<http://www.flexradio.com/> > Click Here for PGP Public Key< > https://sites.google.com/a/flex-radio.com/pgp-public-keys/n5ac> > > [http://www.flex-radio.com/Data/Image/Vector-Logo.jpg] > > Tune In Excitement™ > PowerSDR™ is a trademark of FlexRadio Systems > > > > > _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics.
