21 Mar
2018
21 Mar
'18
5:53 p.m.
I wonder if the Turn around time on one of the DMR UHF amps would be fast
enough to bump the power upto 40 watts or six. Again not possible in the US
due to the antiquated symbol rate rule. I think that there is either a
petition to change this or a soon to be petition to change the rule. That
said changing hats this is the spectrum in the US where ATV operates analog
inputs to some repeaters 421.25out 427.25Simplex and 439.25mhz input. Our
repeater operated on 427.25 with no audio sub-scarier in repeater mode, but
with audio in NASA TV transmit mode.
73,
Lin
On Wed, Mar 21, 2018 at 10:49 AM Steve L <kb9mwr(a)gmail.com> wrote:
> Ronen,
>
> I know you are in a different country, so you likely don't have the
> same ridiculously outdated rules pertaining to data that we have here
> in the US. So I'll spare you the arm chair lawyer stuff.
>
> I had a chance to try some competing cards a few years back. I use
> them on an unused amateur television channel in the lower part of the
> band. I locked them to 5 MHz wide and transferred live streaming
> video just to appease any arm chair lawyers.
>
> I was hoping to use these at modest heights for home to home ham use.
> So 50 feet up, etc.
>
> Things I didn't take into account with that scenario; 1 watt at 5 MHz
> wide is not the same was 1 watt at a few kHz wide for normal voice.
> The using your HT range as a comparison is no good.
>
> I will tell you one thing I didn't really think about with 70cm is the
> Fresnel zone is huge. The radius is about 80 feet, where as on 2.4
> GHz its about 30 feet. So line of sight is only part of the
> equation/problem for most folks. When you only have a watt, all the
> path losses tend to be a big deal; be that not true line of site or
> Fresnel zone obstructions.
>
> They do work quite far, further than I have achieved with other bands,
> if you can get up 100 feet on both ends, etc.
>
> If there was an easy way to do more than 1 watt, I'd expect the would
> have been a lot more useable for me at modest heights and or mobile.
>
> I am presently looking into some Friedcom radios for some slower speed
> applications (under 192000 bps). I am learning the FC-301 that I have
> heard many good things about is now discontinued and replaced by the
> FC-302. If anyone has any experience, I'd appreciate hearing about
> it.
>
> Steve, KB9MWR
>
> On Wed, Mar 21, 2018 at 4:26 AM, R P <ronenp(a)hotmail.com> wrote:
> > Hi there
> >
> > Im starting to check the option to install a Wireless lan on 430 MHZ
> using the Xagyl card ...
> >
> > Has anyone experienced such wireless networks ?
> >
> > Most important to me is the Range and non line of sight operation
> (especially in mobile)
> >
> > Have anyone done it and can say something on the subject ?
> >
> >
> > https://www.xagyl.com/download/XC420M_Datasheet.pdf
> >
> >
> > XC420M DATASHEET - XAGYL<
> https://www.xagyl.com/download/XC420M_Datasheet.pdf>
> > www.xagyl.com
> > WWW.XAGYL.COM RADIO SYSTEM INFORMATION Tx/Rx Specification 20MHz
> Channel Width 432.5MHz and 437.5MHz only DATA RATE MODULATION TX POWER RX
> SENSITIVITY
> >
> >
> >
> >
> >
> > Thanks Gorward
> >
> > Ronen - 4Z4ZQ
> >
> >