Message 27861 in TECH.WW
From: G8MNY
Date: Fri, 14 Aug 26 07:01:00 Z
Newsgroups: TECH.WW
Subject: Rig DC Power & RF Hazards
Message-ID: <1949_GB7CIP>
Path: N2MH4|GB7BED|VA2RIZ|VK3AT|VK7AX|GB7CIP
R:260814/0708Z 35385@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260814/0708Z 15821@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260814/0707Z 4885@VA2RIZ.#LAN.QC.CAN.NOAM LinBPQ6.0.25
R:260814/0707Z 31142@VK3AT.#MEL.VIC.AUS.OC LinBPQ6.0.24
R:260814/0706Z 15662@VK7AX.#ULV.TAS.AUS.AUNZ LinBPQ6.0.24
R:260814/0701Z @:GB7CIP.#32.GBR.EURO #:1949 [Caterham Surrey GBR] $:1949_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Feb 12)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
With connection to add ons to to your rig there is a hazard that can burn out
or dammage ground wiring in your... PC, Noise Eliminating LS, Preamps
Powered Auto ATUs, and rotators etc.
The cause is high DC or RF currents being allowed to flow over signal leads
cause by faulty earths and earth loops.
Rig Earth Noise LS Power lead.
Using no PSU earth connection and only earthing via the rig connection is a
possable cure for low current accessories.
In the next example there is both DC & RF problems.
Earth MAINS
DC can dammage...
PSU earth wiring and Mains lead,
Rig AF socket/PCB,
AF lead, Laptop mother board,
VGA lead, Screen, and Screen power lead.
If there is no DC fault but RF voltage on the rig, RF currents can damage..
Rig AF socket/PCB,
AF lead, Laptop mother board,
Latop PSU's mains RF filter,
VGA lead, Screen.
See my Tech Buls on "BHI Noise Eliminating DSP LS", "A Simple V.O.X. Circuit",
"PSK31 interface isolation".
Y Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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