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G4XNH > FT-817 01.01.07 20:52l 108 Lines 4981 Bytes #999 (0) @ WW
BID : 12366-GB7FCR
Read: DK5SG GUEST DL1RX VE7HFY DG4IAK
Subj: Re: Green wire mod,empty cell case
Path: DB0FHN<DB0RGB<DB0MRW<DK0WUE<GB7FCR
Sent: 070101/1753Z @:GB7FCR.#16.GBR.EU #:12366 [Blackpool] FBB-7.03a $:12366-GB
From: G4XNH@GB7FCR.#16.GBR.EU
To : FT-817@WW
Hi Sten,
Thank you for your comments.
Sten, ZS6CFC wrote:-
> YOU WILL FIND YOUR 13.8 VOLT ONLY WHEN THE CAR IS RUNNING !
Hmm. I know the car battery is 12v but in my experience, I have always
found 13.8v there and NOT just when the engine was running either.
However, checking it now, it is only 12v which somewhat surprises me.
ALL batteries give a greater reading than their stipulated voltage as this
takes into account any voltage drop. Measure your 1.5v leclanche cells or
your 1.2v NiMHs or NiCads and check it yourself.
My comments were made after testing whilst RUNNING the engine. Sadly, this
voltage is not reflected in the cigar socket regulator output.
As a Radio and TV engineer of some 30 odd years, not to mention one with
many years of car maintainance experience beginning when I was around 17
as I could not afford to pay others to do the work and therefore had to
teach myself how to (Successfully I must add) repair various mechanical
and electrical faults, much of this is rather "old hat" to me. I have
repaired or replaced virtually everything in the car electric side.
Ignition points, ignition, distributor cap, sparking plugs and their
leads, ignition coil, and everything else which caused a problem.
Consequently, I know a tad about fault-finding and the maintainence and
repair of said items. At least on the old style cars! These
computer-driven new ones leave me rather cold and unable, (read unwilling)
to attempt a repair half the time.
As I said, the YAESU cigar socket regulator is supposed to be 12-16v input
and 12v regulated output. However, to get a regulated 12v output one MUST
have substantially MORE than 12v, typically, 13+v to 16v so theoretically,
and in this case in practice, it will never get more than 12v with a
stopped engine so it will not regulate correctly and it does not. Less
than 12v and the regulator just will not regulate. No regulator will.
Even with the engine running and with a foot hard down on the throttle,
the voltage displayed on the rig (I need to check how accurate this is,
but it should be a fairly decent representation) the regulator output is
still less than 12v. That WAS a little surprising.
As stated in my earlier SB, the voltage varies between about 11.9v and
10.7v depending on the output setting of the rig so there is obviously NO
regulation at all.
When it is convenient, I have to check the cigar socket output and see if
I can figure out a way of using it successfully. Reports have been read as
mentioned, to the effect that a voltage drop has been observed from the
socket. It may that mine is of that ilk.
I may well revert to my usual practice of rigging a couple of croc clips
direct to the battery with a fused lead to a "loose" cigar socket which
will provide a better voltage though I have my doubts (Reading down your
message I see you later suggest that). It may be that I can increase the
voltage regulator in the car if the socket is getting less than 12v, but I
do not like tinkering unless it is absolutely necessary.
I have ran many things from the cigar socket (Different cars) in the past
and never had a problem of this sort but then I have never ran a 5 watt
transmitter off one before. 2.5 watts is not a problem. In my early
experiences, I believe there was only a thin wire feeding the socket and
drawing too much juice would cause a fire as stated. These days it appears
that things are different in this respect. 10A seems to be Ok.
It seems to me that Yaesu should have based their 5W output on a less than
12v LT line so that a 12v feed, especially when stopped with no engine
running, would have been sufficient to drive it to 5W.
> wiggle them and you see a great variation in output voltage under medium > load.
Incidentally, This car is fairly new and the cigar socket has NEVER been
used by any smoker as no-one here smokes. The contacts are in pristine
condx and they make solid contact (This is the first thing one checks for)
so there is NO variation at all in voltage (According to the rig) with a
"wiggle".
It may well be that I shall have to forgo the use of this fine "regulated"
cigar socket PSU from Yaesu [TIC there of course :-(] and revert to using
my usual direct feed again. Pity that as I had hoped to use what was
available. I will have to find it first! I only ever used it on holiday to
feed into the caravan or tent. 2 croc clips, a 30 fused mains lead with a
DC plug on the end, with NEVER had a problem powering the portable TV or
2.5W rig (Yaesu FT-290R).
> Hope this helps
Not really, but thank you kindly anyway. All the best, Jeff G4XNH.
73 - Jeff, G4XNH @ GB7FCR
Brightraven94atHotmail.com. Replace the "AT" with the "AT" symbol"@".
Interests. (Still) dowsing tunnels, graves and other strange things,
historical research, reading mainly local history, but also other, world
history.
Message timed: 17:42 on 2007-Jan-01
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