Reflector have 55cm and add 10dbi of gain, total of 20dbi for both.
and some more…
Reflector have 55cm and add 10dbi of gain, total of 20dbi for both.
Is 20dBi good with that hardware ?
the arrangement looks awesome
but the specs of SXT say it has a 16dbi antenna and I am running a 7 km link with 2 SXT’s PtP and clear LOS and throughput of more than 10 mbps.
Adding the reflector for a gain of just 4 dbi…is it justified. I guess adding a reflector 2 gain another 20 dbi should be worth. OR may be thats the way ur arrangement works…16 dbi from SXT + 20 dbi from reflector = Total gain 36 dbi .
Am i getting clumsy 
regards
I read it as 10dBi of extra gain on top of the 16dBi already provided by the SXT’s built antenna - for a total of 26dBi per end.
Read again.
The link was -68 and now -45. I said “adds 10dbi”, a 55cm offset antenna will always have 25-26dbi and you can’t just do tha math like 16+26=42. The SXT just act like an feeder now. Anyway the gain is more than 20dbi for link and I’m happy. Costs was 15$/offset and 30min of work. The goal was the beat the interference and that what it did. From 60-80mbps with 25ms average to 140mbps with 5ms at 100mps.
What is distance between the both points, you mentioned it “best the interference” could the narrower angle of pick-up by the dish’s helped this rather than just using SXT, also well done on the DIY how did you peak the gain from both dishes?
wht is the distance betn the links??
2km
Hi, how can i calculate tx-power in this case?
26dbm(SXT)+26dbi(reflector)=52dbm
thanks… other question… how can i calculate gain of offset antena? Lets say 60cm, 80cm, 100cm, 110cm…
if i know…
dBm(power)+dBi(anntena gain)-2,6 = dBm
60cm-26dbi
80-90cm-29-30dbi
don’t know about a calculator.
I would assume this can only be true of perfect alignment at a particular frequency and not above or below this frequency but the best actual alignment obtained can have gain figures much less than quoted.
You can assume it’s not raining, there are no birds in the way, no dust, no air…you get the point.
Once again i must praise your DIY effort on this link and all i what to ask is how much actual gain will be achieved after such efforts, Can i ask what was the signal level at both sides of this 2KM link before and after the SXT reflector,
To date i have only seen prime focus solid dish’s used for 5-6Ghz and my guess is the 55cm dish in the photo’s is a modified offset satellite dish, i quote some theory “The theoretical gain (directive gain) of a dish increases as the frequency increases. The actual gain depends on many factors including surface finish, accuracy of shape, feedhorn matching..”
before was -68 and after -43 as I said . Offset is not modified; it just has a flex pipe (upper one;PEXAL pipe - plastic and aluminium) inside the arm, and the other, because there are the same but not identical, I had to invent another system out of toilet pipes. Any antenna varies in frecvency but the offset just add more gain to the SXT antenna, so there will be some dbi more or less.
Wow what a improvement in signal, did you find the signal varied by a lot if the SXT was moved closer or further from dish on the support arm?
No, as you can see in the pictures the upper one is more distant from dish, and this is how should be. The lower antenna have the SXT too close, so not quite in the focal point, but still work and the same gain.
New record with SXT 154mbps TCP.
