http://radio.kdsanders.com/amateur-radio/analog-simplex-to-coordinate-d-star-repeaters Radio technology and scanning in the Midwest Sat, 28 Aug 2010 23:43:11 +0000 hourly 1 http://wordpress.org/?v=3.0.1 http://radio.kdsanders.com/amateur-radio/analog-simplex-to-coordinate-d-star-repeaters/comment-page-1#comment-77 Bob KG4RRN Fri, 12 Mar 2010 16:37:17 +0000 http://radio.kdsanders.com/?p=350#comment-77 Kevin, I feel as you do that D-STAR repeaters should not take up regular simplex pairs, but to suggest that UHF D-STAR is "better" than any other band is wrong in my opinion. As we all know, radio waves travel father the lower in frequency they are, so what I have learned is that 5 watts on a DSTAR repeater from my QTH(McLean) to Fairfax City (a distance of 15 miles) only requires 5 watts to be intelligble on VHF. ON UHF, it would take somewhere between 15-25 watts on UHF to reproduce the same effective radiated signal. I also experimented with path loss testing back in 2006 when I got my first HT (v82) with the other end being a ID800. It is amazing that D-STAR bends, and is more robust, at attaining a signal over a hillside and no way for an analog at a nearby or same frequency. I believe hams are ready for FSTV (fast scan TV) on 1.2 Ghz. This would be another project in the works, instead of just D-STAR. And 220 Mhz never looked better for propagation , and it can't be heard on most scanners. Finallly, we are so frequency agile, the AHA wants to do disaster drills using their employees, whom are licensed, on our frequencies. I don't hear any complaints, except on the Zed. These are hospital employees, using our frequencies, for their compliance issues. What is wrong with LMR radios??? 73, Bob Kevin,
I feel as you do that D-STAR repeaters should not take up regular simplex pairs, but to suggest that UHF D-STAR is “better” than any other band is wrong in my opinion.
As we all know, radio waves travel father the lower in frequency they are, so what I have learned is that 5 watts on a DSTAR repeater from my QTH(McLean) to Fairfax City (a distance of 15 miles) only requires 5 watts to be intelligble on VHF. ON UHF, it would take somewhere between 15-25 watts on UHF to reproduce the same effective radiated signal. I also experimented with path loss testing back in 2006 when I got my first HT (v82) with the other end being a ID800.
It is amazing that D-STAR bends, and is more robust, at attaining a signal over a hillside
and no way for an analog at a nearby or same frequency.
I believe hams are ready for FSTV (fast scan TV) on 1.2 Ghz.
This would be another project in the works, instead of just D-STAR.
And 220 Mhz never looked better for propagation , and it can’t be heard on most scanners.
Finallly, we are so frequency agile, the AHA wants to do disaster drills using their employees, whom are licensed, on our frequencies.
I don’t hear any complaints, except on the Zed.
These are hospital employees, using our frequencies, for their compliance issues.
What is wrong with LMR radios???
73,
Bob

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