Would like to use 2 25 amp Astron Power Supplies in parallel to power the 6700. I have noticed when running FT8 at about 80 watts with the 1 supply that the output voltage drops from 13.6 to 12.5 V. I also feel the power cables to the radio get warm after a while running at 80 watts.
A second 25 amp supply running would help with the voltage drop but any negatives?
I did RTFM.. but I can also do communications math...
I now have 201 Countries on FT8 (162 confirmed) in about a year. Many of them would have been impossible at 20W. I do have an excellent antenna system and even that does no help enough at 20W when the other guy is weak
Because my Flex and most likely yours can hear FT8 about 6dB better (gain advantage) than most legacy radios with an external interface box. On another thread, Tim went into some detail about the losses and distortion that Legacy Radios and Interfaces introduce to digital modes when they convert from Analog to Digital to Analog in order to be able to decode. Flex with DAX stays totally in the digital domain so you do not have that extraneous distortion and decimation issues.
You need to add power to compensate for that 6dB gain advantage
You may need to add further transmit gain because many Legacy radios also do not hear as well as your Flex so you might need to add another 6-10dB to compensate for his crappy radio/antenna...and that it just to get to a -24 at the other guy's receiver. Realistically you want to be around -18 or better for him to copy you reliably and about -12 or better to bust a pileup.
BUT adding power can be very tricky as you do not want to increase the distortion and splatter on your signal as that will actually make you harder to decode. So when you add power, you must absolutely keep the mike gain out of the red and when I run a KW or more I make sure the mike gain does not even hit the yellow...
what AGM battery are you using? I tried an Optma Yellow Top interfaced with a West Mountain Radio
PowerGate PG 40S. The battery did not last a year. Spoke with the guy at Auto Zone he said they get more than a few of these back every year.Looking to replace it now.
Don't want to hijack the tread