Re: Anybody happens to know VF of this cable ?
Now something to remember,
The VF can be FAR from that spec.
I have seen Brand New cables that were different THAN THE SPECIFIED VALUE.
And as cables age, and it seems this stuff is OLD, that it changes sometimes a LOT as it gets older!
Joe WB9SBD
toggle quoted message
Show quoted text
On 6/11/2023 1:07 PM, Jim Shorney wrote: Yes, well, the point was to have the OP go the last mile to get the information by following the archive link and maybe learn a thing or two in the process. This probably comes from having a mother who was a teacher. She had some clever ways of tricking me into learning things...
73
-Jim
NU0C
On Sat, 10 Jun 2023 20:31:21 -0700
"Jim Lux"<jimlux@...> wrote:
foam, 82% VF
|
Re: Anybody happens to know VF of this cable ?
Yes, well, the point was to have the OP go the last mile to get the information by following the archive link and maybe learn a thing or two in the process. This probably comes from having a mother who was a teacher. She had some clever ways of tricking me into learning things... 73 -Jim NU0C On Sat, 10 Jun 2023 20:31:21 -0700 "Jim Lux" <jimlux@...> wrote: foam, 82% VF
|
Ok got the Smith chart working in conjunction with SWR reading on port one and verified my calibration (honestly it was a fluke and not sure how I did it lol)
So got that issue solved this new software in this one has more settings and things in the menu that weren't there before and are not meantioned in the beginner's guide now.
So on we go!
Thanks for the help guys ill be confused again I'm sure lol
|
Use the Smith Chart display and make sure that the trace is set to S11
And you (very confusingly) need to connect to and calibrate port 0 for S11 measurements. Port 1 (normally 2) is the return port for S21 measurements.
I think that the original nanoVNA designer did a disservice when they labeled the RF ports 0 and 1 (computer style) when everyone else in the known universe's VNA (and the S-parameter numbering and equations) use ports 1 and 2; S11, S21 is a lot more meaningful that way.
Similarly, everyone else uses trace 1,2,3... and save/recall register 1,2,3...
This kind of avoidable confusion has got to be tough on beginners.
Best regards, Don Brant
|
Re: When I connect NanoVNA Saa-2N to the USB-port
Although we occasionally talk about other products with the NanoVNA name, this group is primarily about the original NanoVNA design by edy555 and the improvements of it by Hugen (NanoVNA-H and NanoVNA-H4). You might get better information about your problem with the SAA2 on the group for that product ( /g/NanoVNAV2 - from the original name of that design) or on its web site ( ).
On Sun, Jun 11, 2023 at 9:43?AM Rick Murphy <k1mu.nospam@...> wrote: The USB-C port on the NanoVNA systems is reported to be rudimentary, and
not capable of properly negotiating the voltage it wants. 5 Volts is
expected.
Use a USB-A to USB-C cable and this won't usually be an issue. Some cases
where the computer fed far too much voltage than the Nano could accept have
apparently fried the Nano, so be careful.
73,
-Rick
On Sun, Jun 11, 2023 at 8:46?AM Oddleiv Tungland - LA3GW <
Oddleiv@...>
wrote:
s?n. 11. juni 2023 kl. 14:27 skrev Oddleiv Tungland <oddleiv@...>:
the display starts to flicker.
-Oddleiv
--
Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA
|
On Sun, Jun 11, 2023 at 09:16 AM, Mike Anderson/KF?AWL wrote:
Ok new question.
I'm following the setup in the beginner's guide for process of calibration,
get it done according to the guide and try to verify with the Smith chart . I
screw my open to port 1 trace 1 (trace 0 is my swr trace) were I did the
calibrate and according to the guide it should go to the far right of the
Smith chart. It dont, it just sits in the same place. What am I doing wrong
here?
I'm following it step by step!
Use the Smith Chart display and make sure that the trace is set to S11 Roger
|
Re: When I connect NanoVNA Saa-2N to the USB-port
Not familiar with setup, but the nano is "embedded " is some other hardware.
Can you actually see / observe the nano LED 's?
I believe one is a power / battery indicator and the other monitors the software.
My guess is - the battery is not fully charged and the LCD state is pretty much unknown...
|
Ok new question.
I'm following the setup in the beginner's guide for process of calibration, get it done according to the guide and try to verify with the Smith chart . I screw my open to port 1 trace 1 (trace 0 is my swr trace) were I did the calibrate and according to the guide it should go to the far right of the Smith chart. It dont, it just sits in the same place. What am I doing wrong here?
I'm following it step by step!
|
Re: Estimating coaxial cable length - using TDR
On Sat, Jun 10, 2023 at 11:44 AM, Jim Lux wrote:
Jim Lux,
I got a break from TDR by seeing "Swan Lake" , enjoyed the music , not sure about the ballet. My XYL comment was "woman body legs are not attached to the body..." BTW the antenna "mast" fell in recent windstorm, dummy forgot to add hose clamp to the first cammo pol;e and it broke . No damage to anything, just pride. I found a short piece of same, labelled RG6 cable so I can compare it with the unlabeled one. I need to go back to grammar school and study Fourier to make sense of all of this. I still believe the nanoVNASaver has an issue with using the "sweep" entries... Also the "TDR" and the TDR display options do not match - the "POP up sub menu in particular. PS During my college study there was a joke going around with one of the professors pet question "draw me a graph..."... if you forgot to add dimensions to either axis you have failed the exam. TDR graph is missing the "y axis" dimension. 73 Vaclav AA7EJ of this.
|
Re: Anybody happens to know VF of this cable ?
Thanks, all reposes are greatly appreciated.
73 Vaclav AA7EJ
|
Re: When I connect NanoVNA Saa-2N to the USB-port
The USB-C port on the NanoVNA systems is reported to be rudimentary, and not capable of properly negotiating the voltage it wants. 5 Volts is expected. Use a USB-A to USB-C cable and this won't usually be an issue. Some cases where the computer fed far too much voltage than the Nano could accept have apparently fried the Nano, so be careful. 73, -Rick On Sun, Jun 11, 2023 at 8:46?AM Oddleiv Tungland - LA3GW <Oddleiv@...> wrote:
s?n. 11. juni 2023 kl. 14:27 skrev Oddleiv Tungland <oddleiv@...>:
the display starts to flicker.
-Oddleiv
-- Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA
|
Please do not put the text of your post in the Subject line. The Subject line should refer to the general topic about which the post is intended. Some recent posts have had ridiculously long subject lines, which is not only uneccessary but don't format well, particularly on small devices.
For example:
Wrong:
Subject: How do I load the xyz firmware onto my nanovna when I am upgrading fom version pqr?
Message: I am currently running version pqr firmware on my nanovna. How do I load the xyz firmware onto my nanovna when I am upgrading fom version pqr?
Right:
Subject: Upgrading nanovna firmware
Message: I am currently running version pqr firmware on my nanovna. How do I load the xyz firmware onto my nanovna when I am upgrading fom version pqr?
A contrived example, for sure, but hopefully you get the point. Please think about this when you post a new message.
Thank you.
DaveD
|
Re: When I connect NanoVNA Saa-2N to the USB-port
s?n. 11. juni 2023 kl. 14:27 skrev Oddleiv Tungland <oddleiv@...>:
toggle quoted message
Show quoted text
the display starts to flicker.
-Oddleiv
|
When I connect NanoVNA Saa-2N to the USB-port
the display starts to flicker.
-Oddleiv
|
added a bluetooth module H / H4 / LiteVNA allow install Bluetooth or WiFi to serial module (deivices have internal serial connection pins) for use wireless connect. I test bluetooth HC-05, HC-06 moduless (maximum speed depend from module revision) and get up to 460800 baudrate. PS wireless communication increases measurement noise, especially WiFi
|
On Sat, Jun 10, 2023 at 11:16 AM, Siegfried Jackstien wrote:
added a bluetooth module to my sark100 and can now measure "wireless" (use
smartphone to display sweeps)
A few years ago, before the nanovna, I bought the MINI60 version of the Sark. It's very small, it sweeps the band you choose, shows the frequency of minimum SWR but you can also read each measurement of the sweep. Mine has the built-in bluetooth module, and works with my Android phone. And it IS readable in sunlight! They currently cost around $120, though. About the price of the nanovna-h4 or -F. It's in my Harbor Freight plastic "ammo box" case with the Nanos and an MFJ-207 analyzer. I am still glad to have it. -- Doug, K8RFT
|
Re: Anybody happens to know VF of this cable ?
On 6/10/23 7:34 PM, Jim Shorney wrote: The wayback machine has it.
The 39B2 link below the text leads to a PDF.
73
-Jim
NU0C foam, 82% VF
|
Re: Anybody happens to know VF of this cable ?
The wayback machine has it. The 39B2 link below the text leads to a PDF. 73 -Jim NU0C On Sat, 10 Jun 2023 13:07:27 -0700 "Anne Ranch" <anneranch2442@...> wrote: I did ask Mts Goggle and got no (real) answer
Here is the label on the cable
Eagle Aspen 39B2 RG-6 2.25 GHz Digital Coaxial Cable, 6FT, Black, High Performance 2.25 GHz CMX 18AWG 75¡ãC UL E227171
Please share if you know the velocity factor - VF .
Thanks
|
Re: Anybody happens to know VF of this cable ?
On 6/10/23 1:07 PM, Anne Ranch wrote: I did ask Mts Goggle and got no (real) answer
Here is the label on the cable
Eagle Aspen 39B2 RG-6 2.25 GHz Digital Coaxial Cable, 6FT, Black, High Performance 2.25 GHz CMX 18AWG 75¡ãC UL E227171
Please share if you know the velocity factor - VF .
You might be able to figure it out from the 18 AWG (which is the diameter of the center conductor). The Z depends on the ratio of inner to outer diameter AND the epsilon of the dielectric. OTOH, who's to say that the center conductor really is 18 AWG. You might also be able to figure it out from the loss vs frequency. Or, perhaps, the mfr's website (which doesn't seem to go anywhere.. they may be out of business?) Since I saw some google references to it being used for satellite TV, I'm going to guess it's foam dielectric. Lower dielectric losses for higher frequencies. But testing a sample is the only way you'll know, if you can't get the mfr data sheet. If you have a sample and you cut it open, you'll know. foam looks different than solid.
|
Re: Anybody happens to know VF of this cable ?
How long is it?
Can you measure how long it is, then use the nano to see how long "Electrically" it is,
and there ya go you got it's VF.
Joe WB9SBD
.
A Contest 40 Years in The Making!
<>
MAIDENHEAD MAYHEM
toggle quoted message
Show quoted text
On 6/10/2023 3:41 PM, w6jhp wrote: Is there any way to tell if the dielectric is PE or foam?
73,
Joseph W6JHP
On Sat, Jun 10, 2023 at 3:07?PM Anne Ranch<anneranch2442@...> wrote:
I did ask Mts Goggle and got no (real) answer
Here is the label on the cable
Eagle Aspen 39B2 RG-6 2.25 GHz Digital Coaxial Cable, 6FT, Black, High
Performance 2.25 GHz CMX 18AWG 75¡ãC UL E227171
Please share if you know the velocity factor - VF .
Thanks
|
Jim Shorney
Mike Anderson/KF?AWL
Donald S Brant Jr
Shirley Dulcey KE1L
Roger Need
