Click to expand
Click to expand
Here's my (and N0RC) measured total XMT current draw
vs three
non-mod T4 units at 5 watts, per band. VDC IN
is accross battery.
RF_Out | 0.1 W | 1 W | 2 W | 5 W | 5 W | 5 W | 5 W | 5 W | Watts@ | ||
T4mod | T4mod | T4mod | T4mod | T4mod | 2 Amps | ||||||
K2 (by) | W4ED | W4ED | W4ED | W4ED | N0RC | K1JD | NOSS | KW1ND | W4ED | Xmt | |
VDC IN | 13.4 | 13.4 | 13.4 | 13.4 | 13.2 | 13.4 | 13.5 | 13.98 | 13.4 | Eff. | |
MHZ | |||||||||||
3.56 | 0.50 | 0.68 | 0.84 | 1.24 | 1.82 | 1.90 | 1.60 | 6.0 | 22% | ||
7.04 | 0.54 | 0.68 | 0.82 | 1.18 | 1.38 | 1.68 | 1.70 | 1.55 | 9.5 | 35% | |
10.10 | 0.56 | 0.70 | 0.82 | 1.20 | 1.70 | 1.75 | 1.60 | 6.6 | 22% | ||
14.06 | 0.54 | 0.70 | 0.80 | 1.12 | 1.44 | 1.78 | 1.60 | 1.60 | 10.2 | 38% | |
18.08 | 0.56 | 0.70 | 0.92 | 1.26 | 1.84 | 1.58 | 1.75 | 9.8 | 37% | ||
21.06 | 0.56 | 0.76 | 0.98 | 1.36 | 1.52 | 1.80 | 1.82 | 1.70 | 9.1 | 34% | |
24.90 | 0.56 | 0.78 | 1.00 | 1.40 | 1.80 | 1.76 | 1.85 | 8.0 * | 33% | ||
28.06 | 0.56 | 0.84 | 1.06 | 1.56 | 1.74 | 2.14 | 1.80 | 8.2 * | 34% | ||
Ave. | Amps | 1.29 | 1.44 | 1.77 | 1.72 | 1.47 | |||||
8.4 W | Ave. | ||||||||||
Xmt | Eff. | 29% | 26% | 21% | 22% | 24% |
* watts output max reached at ~ 1.8 A
Right most column was established by turning the power
level
up until 2.0 amps registered on K2 display then read K2
power out. Also, I understand this power compression
does
nasty things to SSB, probably reducing useful PEP power
even more than for CW. I'm not interested in SSB,
but am
very interested in getting the last 1/2 hour of FYBO,
BUBBA,
QRPTTF, FD, or ARS/BB out of a battery pack !!