These are the graphs for the antenna analyzer. Focus for right now is 27.385
comments on how it looks?
Thanks
comments on how it looks?
Thanks
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maco yquad analyzed
- Thread starter mb91w126
- Start date
Seems to be very wide banded, which can be useful.
But how does the impedance and SWR plots look for a 4mhz bandwidth?
But how does the impedance and SWR plots look for a 4mhz bandwidth?
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The plots are nice !
Amazing what can be "measured" isnt it ?
Perhaps its usefull if in the future you could provide additional data:
For example:
1- Is it measured at the feedpoint or coax attached to it ?
2- It migth be interesting to watch the 2;1 swr bandwidth.
As often the SWR bandwidth should be provided by a manufacturer.
Its nice to have that confirmed
Besides its interesting to see from an antenna point of view.
Im not seeing what Robb is seeing with the "wide bandwidth" (yet)
3 Some one migth quarrle (how does one write that word ?) about the 22 dB return loss, yes it can be improved...but good enough for today.
Kind regards,
H.
Amazing what can be "measured" isnt it ?
Perhaps its usefull if in the future you could provide additional data:
For example:
1- Is it measured at the feedpoint or coax attached to it ?
2- It migth be interesting to watch the 2;1 swr bandwidth.
As often the SWR bandwidth should be provided by a manufacturer.
Its nice to have that confirmed
Besides its interesting to see from an antenna point of view.
Im not seeing what Robb is seeing with the "wide bandwidth" (yet)
3 Some one migth quarrle (how does one write that word ?) about the 22 dB return loss, yes it can be improved...but good enough for today.
Kind regards,
H.
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I'm in agreement with Henry's second point. That isn't nearly wide enough to show the SWR bandwidth. Being able to see the 2:1 SWR point on both sides of your tuning frequency is best, only that can tell you what kind of bandwidth you have. I also prefer to see a little more than essentially a fourth of the bandwidth of what is already a very narrow CB band to begin with for the other available variables. It appears good with the limited data shown, but the range of frequencies shown is so limited that I can't see what could end up being critical information.
Anyway, enjoy the antenna.
The DB
Anyway, enjoy the antenna.
The DB
yes it is! Thanks!
I will upon return.
measured from coax at transmitter input end.
50' of DX engineering rg-8U.
No way I was climbing 15' up a pole.
I get sweaty palms just standing on a shallow pitched roof.
yes, I can locate those bounds, produce an post those graphs.
I spent some time reading a number of articles which indicated that higher RL db is is inverse to vswr. So I'm comfortable with that value unless others prove otherwise.
example:http://info.lsr.com/LSR-Wireless-RF.../Terms-Definitions-of-Basic-Antenna-Design-II
The reason I chose a narrow band is that I'm only interested in U/L sideband in those frequency ranges for now. As my expertise/experience increases with my licensing levels, a wider diversity of aluminum shapes will be propagating across the roof line of the house.
thanks!
Hmm. The reason you test at the antenna and not a long length of coax is because if you've a lot of coax loss it gives misleading SWR results. You can have a poorly tuned antenna and if its at the end of a long enough run of coax the SWR can look pretty good. Its only when you start examining the values of R and X you realise its not that clever.
I'm beginning to wonder how one can correctly assemble any antenna without an analyzer.
Now the question is how to move x left .5MHZ.
My inclination that fiddling with the gamma matcher wont move X and that either moving the reflector away or the lengthening the driven element is how to move X.
Close??