| |
ZL1UIC > POWER 05.07.03 00:19l 427 Lines 2945 Bytes #999 (0) @ WW
BID : C20395ZL1UIC
Read: DB0FHN GUEST OE7FMI
Subj: Re: that negative fuse..
Path: DB0FHN<DB0RGB<OK0PPL<RZ6HXA<ER3KAZ<DB0RES<ON0AR<VK6HGR<ZL2BAU<ZL2BAU<
ZL2WA<ZL1UX
Sent: 030704/0031Z @:ZL1UX.#20.NZL.OC #:58436 [Hamilton] FBB7.00i $:C20395ZL1UI
From: ZL1UIC@ZL1UX.#20.NZL.OC
To : POWER@WW
>
> .....what happens if the battery negative lead becomes detached or high
> resistance to the vehicle earth ?
> The starter current will flow through the antenna earth of the co-ax
> onto your radio and ground, perhaps via some PCB tracks, to the negative
> wiring.
This I find rather strange
>
> .....what happens if the battery negative lead becomes detached or high
> resistance to the vehicle earth ?
> The starter current will flow through the antenna earth of the co-ax
> onto your radio and ground, perhaps via some PCB tracks, to the negative
> wiring.
Doesn't make sense to me unless the rig is an obscure design. Uusally the
earth braid of the co-ax connects to the socket with a connection to the
frame of the rig, and the -ve lead contacted to that. Not normall a
problem unless the rig is fitted to a vehicle with +ve earth. Seen a few
wiring fires this way.
> it makes no sense..if the negativ0e or "earth" battery lead becomes
> detached, there will be no starter current..
> and if it has substantial resistance, whatever current flows will still
> be along the battery lead, with a voltage drop at the terminal..
> and I cannot follow the argument about all the current finding its way
> along the negative radio lead..what about other leads anyway..
> I thought the reason for both leads having fuses was that the negative
> lead would be the "active" one where the vehicle has a positive battery
> earth..not really relavent in these times though..
> have I missed the whole point of the discussion perhaps ??..
>
> sent by Paul VK6MR @ VK6BBS
Possibly I have too.
>
> it makes no sense..if the negative or "earth" battery lead becomes
> detached, there will be no starter current..
> and if it has substantial resistance, whatever current flows will still
> be along the battery lead, with a voltage drop at the terminal..
> and I cannot follow the argument about all the current finding its way
> along the negative radio lead..what about other leads anyway..
> I thought the reason for both leads having fuses was that the negative
> lead would be the "active" one where the vehicle has a positive battery
> earth..not really relavent in these times though..
> have I missed the whole point of the discussion perhaps ??..
>
> sent by Paul VK6MR @ VK6BBS
Cheers/73
- Allen, ZL1UIC @ ZL1UX
Cambridge, N.Z. RF72RC
Message timed: 10:35 on 04 Jul 03
Message sent using WinPack-AGW V6.80
Using P233, W98se, AGW-PE, Baycom modem, IC-2A, Digitor 30w amp.
Read previous mail | Read next mail
| |
