[WT-support] MicroHam USB II and WT

[Jozef Urban, OM7ZZ]

Hi Csaba,

Noise means that the shield of USB cable acts like antenna. It can be a 
result of unproper USB controller design of the USB trasceiver or poor 
computer grounding. Check if your radio and computer are grounded each with 
separate, thick ground wire to the central ground point of the shack.
Also additional ferrite will improve such situation. Three, four turns on 
2.4" diameter toroid should helps.

73 Jozef


----- Original Message ----- 
From: "Csaba Nagy HA3LN" <csaba at ha3ln.hu>
To: <support at win-test.com>
Sent: Sunday, 07 January, 2007 20:49
Subject: [WT-support] MicroHam USB II and WT


> Hi All,
>
> Sorry for a little off topic but it relates with Win-Test after all.
>
> When I start "USB Device Router" for USB II interface I have S9 noise on 
> 20 and 10m from almost S0. I observed the same on 40 and 15m too but with 
> much lower amplitude.
>
> The config: FT1000MP MkV F and HP laptop + USB II.
> The grounding and antennas seem good.
>
> Anybody experienced the same or similar so far?
>
> Anyway it works great.
>
>
> Thanks for help.
> 73!
> Csaba  HA3LN
>
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