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Παραθέτω αυτούσιες 2 αναφορές του Phil. G4OBK:
για τις LiPo:
__Post by G4OBK on 25th February 2010 at 14:40
In reply to all: __
Thank you for your interest. These readings may interest you, especially if you run the FT-857:
G4OBK Battery Tests 25/02/10
FT-857 on test with 4S1P 14.8v LiPo 5A battery.
Cycling on TX/RX 15s each 7032 KHz CW
Shack temperature 16c
RX Current 620 mA
Current @ 50w CW output 5.3A
Time Voltage
Start 16.6v
30 mins 15.4v
45 mins 15.1v
60 mins 14.9v
75 mins 14.6v
85 mins 13.3v
87 mins 12.5v (Note still sounding fine on monitor RX)
88 mins 10v No TX No tone
89 mins 9v RX still working at low volume - amazing
Charge time at 3A max from flat was 112 minutes, voltage restored to 16.78v
Current Drain on 4S1P 14.8v LiPo Battery:
RX 600mA-700mA varies by mode
TX CW on 7025 MHz into dummy load
Power Current Drain
5 Watts 4A
10 Watts 5.3A
25 Watts 7.2A
50 Watts 10.4A
75 Watts 11.9A
100 Watts (Max) 13.5A
TX SSB on 144.300 MHz into dummy load
50 Watts (Max) 7.5A on whistle
TX FM on 145.500 MHz into dummy load:
Power Current Drain
5 Watts 3A
10 Watts 3.75A
25 Watts 5.5A
50 Watts (Max) 7.75A
My fridge will not go below 7c and my freezer is at -17c so I guess I shall wait until the overnight temperature falls below zero before I do some LiPo temperature testing.
I'm going to now do the same tests with a 7A SLAB (used since 2008 so probably going off a bit now) and see how that performs as a comparison, albeit at normal room temperatures.
Phil
για τις μολύβδου:
Post by G4OBK on 26th February 2010 at 11:10
FT-857 with 7 Ah SLAB on test 26/02/10. SLAB purchased 2008 - efficiency not known.
Cycling on TX/RX 15s each 7032 KHz CW. Power control set at 50w throughout.
Shack temperature 15c
Time Voltage Power Out
Start 12.3v 50w
30 mins 12v 50w
45 mins 11.6v 50w
60 mins 11.3v 50w
75 mins 10.7v 50w
87 mins 9.9v 25w (note unstable but readable)
90 mins 9.6v 10w (ditto)
100 mins 9.2v 2w (ditto) testing discontinued.
RX still working fine at 9.2v.
Current drain on 7 AH SLAB:
RX 600-700mA (varies by mode)
TX CW on 7025 MHz into dummy load
Power Current Drain
5 Watts 3.85A
10 Watts 5A
25 Watts 7A
50 Watts 10.2A
75 Watts 11.8A
100 Watts (Max) 12A
TX SSB on 144.300 MHz into dummy load
50 Watts (Max) 7.5A on whistle
TX FM on 145.500 MHz into dummy load:
Power Current Drain
5 Watts 2.8A
10 Watts 3A
25 Watts 5.6A
50 Watts (Max) 7.75A
The figures give an indication on how long these batteries are likely to last during an activation based on running 50 watts CW.
More cold weather awaited so I can test out those LiPo's - I may end up sending one down to Richard's (G4ERP) environmental chamber if it stays warm!
73 Phil