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Chinese duplexers
Jim Lux wrote:
On 8/30/2011 1:26 PM, Rob wrote: wrote: "Geoffrey S. wrote in message ... snip Geoff. If your intent is to experiment with the cheap duplexer, what I have to offer is irrelevant. However, if you aim to build a repeater, consider getting your isolation over distance (much greater than 10m). Put the transmitter and receiver a few km apart and link them using another band authorized in your area (440?). I encountered this in Key West Florida some years ago. Worked fine there. It is done here on 10m, where the duplex offset is only 100 kHz and a duplexer is physically very large. However, what I hear from the repeater team is that one is in fact building and maintaining 2 repeaters, doubling the chance of any faults and problems. Setting up the 10m repeater was much more work than everyone envisioned, and many had experience on 70cm etc. What about VoIP using 802.11 as the link. These days, that might be easier than trying to cobble up a 440 remote link. At first they used (or planned using) an FM link on 23cm, then they switched to digital voice over 802.11a (6cm), then to 802.11g on 13cm, and I think they now use a wired internet connection. |
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