Ken,
The FLEX-1500 was specifically engineered to mitigate RF and noise on
the USB connection; the RF and USB are physically separated as much as
possible, we use common mode ferrite chokes on the USB interface to
remove any RF signals riding in on the USB cable and the USB cable
supplied with the FLEX-1500 has a full metal shield around the RX and TX
wire pairs whereas most USB cables do not. The only thing getting
through the USB connector is the USB signals themselves.
What little USB "noise" there is, is more likely generated by the USB
chip (clock) inside the 1500 and is not in any of the ham bands, rather
than stuff coming in via the cable, so signal quality is unlikely to
improve with the additional cable treatments like "galvanic isolation".
Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: [email protected] <mailto:[email protected]>
Web: www.flexradio.com <http://www.flexradio.com>
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On 8/19/2012 6:37 PM, Ken Alexander wrote:
I see that Heros Technology sells a USB Galvanic Digital Isolator for
SDR radios. It provides isolation in the USB connection between the
computer and the transceiver and prevents "computer noise" from
entering the 1500. So, a few questions:
1. Do we know if the Flex-1500 already has this kind of protection
built in?
2. Has anyone on the list found noise on their 1500 that they
determined was entering through the USB port?
Thanks for any advice!
73,
Ken Alexander
VE3HLS
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