Not a good idea ! We used a TenTec Pegasus during Field Day and whenever
voltage dropped to about 12.3V, the rig was rendered unusable. We thought
about using a power booster device (a low noise one) as we had done with a
laptop requiring 16V, but had a FT-817 on hand which is better suited to a wide
variety of power supply input voltages.
Still like the idea of using a Pegasus (or if we had one, a Jupiter) with
emergency power, but would need to either have a low noise "booster" device, or
perhaps an extra cell that can be switched in series, such as using individual
lead acid cells to boost the voltage back up to around the 14V max that the
Pegasus lists (Jupiter lists same on TenTec site).
We used a kit from N4UAU to do the job with the laptop. There is a higher
power version, or you can built yourself for higher power if running a
Jupiter/Pegasus QRP isn't your intent ! From old QST article by N4UAU:
http://user.gru.net/n4uau/kits/Booster%20QST.pdf
Cheers & 73 de Mark W4CHL
Mark R. Smith W4CHL@amsat.org
Chapel Hill, NC http://rtpnet.org/parc
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