Gayle...you asked aboutthe PS. Specs - Current out -- continuous 22 Amps at 13.8 Vdc Front Panel Adjustable Voltage (9-15 Vdc)
22A continuous is plenty for 100 W xcvr. Adjust the DC Volt knob for a reading of 13.8V on the meter. Maybe you are meassuring in the AM mode...bet your rig goes to 50 W max in AM mode. Key down CW, max smoke should be 100 W+ into a dummy load or into a matched >1.5:1 antenna system. If you do not have a dummy load then you have no knowledge of the Z that the xmitter output is seeing, so the output is dependent on the Ant/TL Z. What does the SWR meter in the rig read? Close to 1:1?....if higher than 1.5:1 then the xcvr will cut back power out. Gayle, I am grasping for straws above....you have got to establish a base line in your measurements/operations and to do that you need standards -- dummy load, volt Ohm meter, watt meter, etc. Buying a used rig without the faculties to measure the performance is not good practise. Get some test gear and you will improve your Ham Radio experience immensily. Plus you will understand what is going on when the rig ain't werkin. 73...Rick -- W5RH Rick Hiller *The Radio Hotel* -- W5RH On Sat, Apr 8, 2017 at 7:27 PM, Gary Sitton via BVARC <[email protected]> wrote: > You need to measure the voltage as I indicated with the rig in CW mode > into an antenna or whatever you used before when you measured the power > output. Now a cheap but accurate digital volt-ohm meter will cost as > little as $10. A small investment in your hobby I think. > > Gary, K5AMH > > Sent with AquaMail for Android > http://www.aqua-mail.com > > On April 8, 2017 5:27:52 PM Gayle Dotts via BVARC <[email protected]> wrote: > >> Hi Gary, >> >> I don't have anything to measure the actual load on the FT-920, >> unfortunately no dummy load available either. Bought the radio used and >> without a power chord. I ordered a Yaesu power chord thru MFJ and it came >> with two inline fuses one on the positive side one on the negative side, >> both rated at 20A and look good. Question If I might ask still is >> MFJ-4225MV@25A ..... too under powered or acceptable barely but could be >> better. Thank you for your input I appreciate it! >> >> 73 >> Gayle Dotts >> KF5LVZ >> >> On Sat, Apr 8, 2017 at 2:29 PM, Gary Sitton via BVARC <[email protected]> >> wrote: >> >>> Gayle: >>> >>> Measure the actual under load (100 W. CW) voltage >>> at the back of the FT-920. Faulty inline fuse holders >>> or connectors, and wiring losses can cost you 1/2 v. or >>> more. You need a full 13.5 to 13.8 VDC at the back. >>> Since power to a R Ohm load is V*V/R, a relative power >>> line voltage drop will result in ~twice a relative power >>> loss for a fixed R. >>> >>> 73s, >>> Gary Sitton, K5AMH >>> [email protected] >>> >>> On 4/8/2017 14:17, Gayle Dotts via BVARC wrote: >>> >>> Got a question on power supply for my Yaesu FT-920. >>> >>> The FT-920 manual says: 13.5V DC….Rx(w/signal) @2.5A, Tx (100W) >>> @22.0A. My current power supply is a MFJ-4225MV 25A switching power. Is >>> this MFJ will power the Yaesu but I don’t really see the 100W on output Tx, >>> although the amp meter on the MFJ shows 6-12A while transmitting running >>> low to high on the RF PWR knob on the FT-920. Do I need to increase the >>> power supply?? Please advise. >>> >>> >>> Thanl you, >>> >>> Gayle Dotts >>> >>> KF5LVZ >>> >>> >>> _______________________________________________ >>> BVARC mailing >>> [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> Message delivered to [email protected] >>> >>> >>> >>> >>> _______________________________________________ >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> Message delivered to [email protected] >>> >>> >> _______________________________________________ >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Message delivered to [email protected] >> >> > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > >
_______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to [email protected]
