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YT7MPB > TECH 01.11.23 19:01l 44 Lines 1766 Bytes #999 (0) @ WW
BID : 4888_YT7MPB
Read: GUEST
Subj: Re: PSK31 interface isolation
Path: IW8PGT<IZ3LSV<I0OJJ<N6RME<YT7MPB
Sent: 231101/1655Z 4888@YT7MPB.#NSD.SRB.EU LinBPQ6.0.24
On Wed, 01 Nov 23 00:01:00 Z
G8MNY wrote:
> Having just got going on this mode with an IBM Laptop & ICOM IC735. I
> was concerned about damaging either with a direct connection!
>
> This applies to all modes like FT8 RTTY SSTV AMTOR etc, where a
> PC/RIG is connected to anything with medium to high DC current supply
> with a different earth or has RF currents!
>
> So I have made an isolated barrier TO PROTECT THE LAPTOP's SOUND CARD
> FROM R.F.I. & getting ZAPPED & also the Rig from the Laptop's RF QRM.
> As well as doing that it also STOPS any HUM LOOPS & DAMAGING DC PATHS
> the can also burn out RIG's MIC/LS & the PC interfaces!
>
....
> 73 de John G8MNY @ GB7CIP
>
>
Interesting article, John. In my case, the laptop is *not* connected
directly to a rig (FT-847, or FT-857, or any other I find available in
the club's radio room, HI), but rather via some data controller (such as
SCS Dragon) or via an external sound-card interface (such as RIGblaster
Advantage). Both of those go to the laptop's USB ports.
Up to now I did not realize much of RFI issues (if any), and hope
nothing shall/will be zapped. However, as I sometimes have to power the
mentioned data controller by using a Chinese 220VAC/12VDC wall charger
(and that means not using the same 30amp PSU I use for supplying the
rig) there might be some parasitic currents flowing around. However not
big deals there yet.
Next to it is the controller/sound iface connection to the same 8-pin
microphone connector at FT-847/FT-1000MP front panel. I just made a
simple "Y" adapter to bring two 8-pin mic plugs into one 8-pin socket.
All works without complaints, however some folks think that some
isolation would not harm there too. Any idea?
--
73 de Misko YT7MPB@YU7BPQ.#NSD.SRB.EU
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