Hi John, On Wed, 3 Dec 2008 21:06:24 -0000, John Stringer wrote:
>1. The RIT on the R7 should be about plus or minus 3khz It has been modified >to plus or minus 200hz. Yes 200hz. Why? Probably the same reason I reduced the range on the RIT control in my HR2510. WHen using the RIT as a "fine tune" control, you're not usually going more than a couple of hundred Hertz, at the most. There's really not much need for 6 KHz of range, and reducing the range makes it easier to fine tune with that tiny knob. >2. An SO239 has been installed on the back panel > A. Connect the antenna to the SO239 so bypassing the Antenna Switch. > > B.Install a jumper between the SO239 and the spare RCA socket and put the >antenna into its proper RCA connector so routing the antenna via the Antenna >Switch--in other words the normal way. That's an interesting one. My fisrt thought is to allow the user to bypass the antenna selector, as the splitter has some loss through it. There is theoretical 3 dB dignal drop through any two-way splitter (half the signal goes to each port), plus circuit losses, which typically adds up to 3.5 to 4 dB in the real world. However, I was looking at the schematic just a couple of nights ago, and it appears that the splitter circuit is bypassed when the antenna selector is set to Main/Alt ... which would make sense. This would leave and small (probably insignifigant) loss in the cables and switch itself. In light of that, the only thing that really makes sense me is pehaps the owner wanted to use the antenna selector to feed two other radios other than the R7 from one of two antennas, at the same time the R7 was being used on a third antenna. Or maybe that it was an easy place to put a real antenna connector, and the owner elected to bypass what was essentially an unused feature when the radio was used in that configuration, or the isolation between ports wasn't sufficient for some reason. Maybe someone else has a more obscure reason? 73 -Jim NU0C _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
