Hi guys, just wondering if anybody has any real-world experience on the Dynadish ? I am thinking of deploying a pair of them to tackle a clear LOS PTP link of 35km, all the link planners say I will be at around -61 signal at that distance with those radios and antennas, just wondering if anybody has any comments good or bad before I give it a go. Thanks Paul
G'day! I think -65 is quite a bit too optimistic :-} At 58000MHz, free space loss alone is about 138dB. Assuming your EIRP is set to max allowed of 36dBm (single pchain only) then signal at the receiver end would be 36-138 = -102, then add the antenna gain at the receiver end (25dBi) gives a theoretical result of only -77 Still good enough for a reliable link, but not near your estimate... Of course of your deployment locations are eligible for a5GHz license, you may be able to achieve that kind of result! (is that what you are calculating?) Cheers, Mike. -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 7:05 PM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] Dynadish ?? Hi guys, just wondering if anybody has any real-world experience on the Dynadish ? I am thinking of deploying a pair of them to tackle a clear LOS PTP link of 35km, all the link planners say I will be at around -61 signal at that distance with those radios and antennas, just wondering if anybody has any comments good or bad before I give it a go. Thanks Paul _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
Cough cough, yes Mike, you are right, of course that would be correct at the correct EIRP ;-) I need better than -77 though, I want to run some decent throughput across it, then again even at -77 I should see 40 or 50M I suppose, I can have 36dBm in each plane as well so that will give me a bit of a boost. I was of course working on max power output of 28dBm and antenna gain of 25 dBi or an EIRP of maybe a little higher than 36..... Maybe I need a bigger dish, have to get better Internet for home !! I am dying with 4M ADSL2, I have hundreds of megs of fibre provisioned just 35km's away, and am 450M above sea level 100% LOS and no Fresnel issues, I just need the right gear to get it to me :-) Regards Paul -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Mike Everest Sent: Monday, 12 October 2015 9:34 PM To: 'MikroTik Australia Public List' Subject: Re: [MT-AU Public] Dynadish ?? G'day! I think -65 is quite a bit too optimistic :-} At 58000MHz, free space loss alone is about 138dB. Assuming your EIRP is set to max allowed of 36dBm (single pchain only) then signal at the receiver end would be 36-138 = -102, then add the antenna gain at the receiver end (25dBi) gives a theoretical result of only -77 Still good enough for a reliable link, but not near your estimate... Of course of your deployment locations are eligible for a5GHz license, you may be able to achieve that kind of result! (is that what you are calculating?) Cheers, Mike. -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 7:05 PM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] Dynadish ?? Hi guys, just wondering if anybody has any real-world experience on the Dynadish ? I am thinking of deploying a pair of them to tackle a clear LOS PTP link of 35km, all the link planners say I will be at around -61 signal at that distance with those radios and antennas, just wondering if anybody has any comments good or bad before I give it a go. Thanks Paul _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
Hi Paul! Actually,... You can't have 36dBm in two planes since eirp is based on /total/ energy emitted from the antenna /system/ ;-) Therefore, maximum tx power for a dual chain system is only 33dBm per chain :-( May be a job for MikroTik mAnt 30dBi dish? (we gave a few units arriving next week ;) Cheers! Mike. -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 10:09 PM To: 'MikroTik Australia Public List' <public@talk.mikrotik.com.au> Subject: Re: [MT-AU Public] Dynadish ?? Cough cough, yes Mike, you are right, of course that would be correct at the correct EIRP ;-) I need better than -77 though, I want to run some decent throughput across it, then again even at -77 I should see 40 or 50M I suppose, I can have 36dBm in each plane as well so that will give me a bit of a boost. I was of course working on max power output of 28dBm and antenna gain of 25 dBi or an EIRP of maybe a little higher than 36..... Maybe I need a bigger dish, have to get better Internet for home !! I am dying with 4M ADSL2, I have hundreds of megs of fibre provisioned just 35km's away, and am 450M above sea level 100% LOS and no Fresnel issues, I just need the right gear to get it to me :-) Regards Paul -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Mike Everest Sent: Monday, 12 October 2015 9:34 PM To: 'MikroTik Australia Public List' Subject: Re: [MT-AU Public] Dynadish ?? G'day! I think -65 is quite a bit too optimistic :-} At 58000MHz, free space loss alone is about 138dB. Assuming your EIRP is set to max allowed of 36dBm (single pchain only) then signal at the receiver end would be 36-138 = -102, then add the antenna gain at the receiver end (25dBi) gives a theoretical result of only -77 Still good enough for a reliable link, but not near your estimate... Of course of your deployment locations are eligible for a5GHz license, you may be able to achieve that kind of result! (is that what you are calculating?) Cheers, Mike. -----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 7:05 PM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] Dynadish ?? Hi guys, just wondering if anybody has any real-world experience on the Dynadish ? I am thinking of deploying a pair of them to tackle a clear LOS PTP link of 35km, all the link planners say I will be at around -61 signal at that distance with those radios and antennas, just wondering if anybody has any comments good or bad before I give it a go. Thanks Paul _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
*grin* Maybe he's a fellow ham, and is using it for experimentation purposes? ;) I remember once commandeering a work link that'd failed, for 'experimentation purposes', and ending up with 1600W EIRP on one end, ~900 on the other. Still couldn't get the darned 680m link up.. Turned out the hospital which was right in the middle of the path had gotten sick of me continually reporting them to the ACMA when they were testing MRI's etc outside of their shielded rooms and pushing the noise floor up by 30dB, so had built their new radiology building with 2" of lead lining in the walls. For all three stories!. On 13 October 2015 at 08:21, Mike Everest <mike@duxtel.com> wrote:
Hi Paul!
Actually,...
You can't have 36dBm in two planes since eirp is based on /total/ energy emitted from the antenna /system/ ;-)
Therefore, maximum tx power for a dual chain system is only 33dBm per chain :-(
May be a job for MikroTik mAnt 30dBi dish? (we gave a few units arriving next week ;)
Cheers! Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 10:09 PM To: 'MikroTik Australia Public List' <public@talk.mikrotik.com.au> Subject: Re: [MT-AU Public] Dynadish ??
Cough cough, yes Mike, you are right, of course that would be correct at the correct EIRP ;-)
I need better than -77 though, I want to run some decent throughput across it, then again even at -77 I should see 40 or 50M I suppose, I can have 36dBm in each plane as well so that will give me a bit of a boost.
I was of course working on max power output of 28dBm and antenna gain of 25 dBi or an EIRP of maybe a little higher than 36.....
Maybe I need a bigger dish, have to get better Internet for home !! I am dying with 4M ADSL2, I have hundreds of megs of fibre provisioned just 35km's away, and am 450M above sea level 100% LOS and no Fresnel issues, I just need the right gear to get it to me :-)
Regards Paul
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Mike Everest Sent: Monday, 12 October 2015 9:34 PM To: 'MikroTik Australia Public List' Subject: Re: [MT-AU Public] Dynadish ??
G'day!
I think -65 is quite a bit too optimistic :-}
At 58000MHz, free space loss alone is about 138dB. Assuming your EIRP is set to max allowed of 36dBm (single pchain only) then signal at the receiver end would be 36-138 = -102, then add the antenna gain at the receiver end (25dBi) gives a theoretical result of only -77
Still good enough for a reliable link, but not near your estimate...
Of course of your deployment locations are eligible for a5GHz license, you may be able to achieve that kind of result! (is that what you are calculating?)
Cheers, Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Monday, 12 October 2015 7:05 PM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] Dynadish ??
Hi guys, just wondering if anybody has any real-world experience on the Dynadish ?
I am thinking of deploying a pair of them to tackle a clear LOS PTP link of 35km, all the link planners say I will be at around -61 signal at that distance with those radios and antennas, just wondering if anybody has any comments good or bad before I give it a go.
Thanks Paul _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
_______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
_______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
_______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
-- Damien Gardner Jnr VK2TDG. Dip EE. GradIEAust rendrag@rendrag.net - http://www.rendrag.net/ -- We rode on the winds of the rising storm, We ran to the sounds of thunder. We danced among the lightning bolts, and tore the world asunder
participants (3)
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Damien Gardner Jnr -
Mike Everest -
Paul Julian