On Sun, Dec 29, 2019 at 05:27 PM, John Smith wrote:
I don't see an attachment. Are the newest ones, the one with the plastic enclosure and fancy gift box? The same seller has those, the white, and the F versions too.
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Tks John,
Didn't notice I forgot to add the attachment showing the new version 3.4 printed circuit board. Here it is.
- Herb
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Not to beat a D. Horse but if it were mine I would test power out of the
radio - close and then power to the antenna - far. With a good feedline you
should see only 1 & 1/2 dB loss per 100 feet at 150 MHz. The nice thing
about this test is that it is intrusive and will force a technician to
check both ends of the connection. This will give you a chance to look for
kinks and leaks.
Just my $0.02 good luck and happy hunting.
NE7LS
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On Sun, Dec 29, 2019, 3:46 PM Kevin B <buchholz676@...> wrote: Ok I'm new to all this and I'm confused now. I am testing a vhf 1/4 wave
base antenna. I get horrible range, like a mile on simplex, 25 watts about
30 feet up... so wanted to do some testing. I set the VNA to 110-480 MHz,
line loss (think that's what it's called) and swr. See pictures. I was
expecting a dip somewhere close to where I expect it to be tuned for and
nothing. There isn't really any dips... Based on what I see the antenna is
has good swr everywhere (not possible). How is it possible for the swr to
be less than 1.5 from 110-480 MHz. Is this unit garbage or an I doing
something wrong? I'm new to these and their technology but I think I know
what I'm doing... Sorry I couldn't get clear pics...
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On Sun, Dec 29, 2019 at 04:25 PM, hwalker wrote:
John,
I believe the most recent messages have been from members who want to ensure
they receive the NanoVNA-H with the version 3.4 printed circuit board (see
attachment).
I don't see an attachment. Are the newest ones, the one with the plastic enclosure and fancy gift box? The same seller has those, the white, and the F versions too.
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Let's back up to square one.
Is your antenna for 2 meters or 70 cm?
In either case, set your span to NO MORE than 10 MHz. That will give you
all 101 points dedicated to that span or roughly one point per 10 kHz.
Your original span was WAY too broad.
Set your center frequency, either for 2-meters or 70- cm, which ever you
have for the antenna.
Since you only need a one-port measurement, reflection loss, or s11, do a
one-port cal using the open, short, and proper load which may have come
with your unit on Ch0. No need for using Ch01 or isolation or transmission
cal.
Store the cal.
Now and ONLY now, collect your antenna.
Do a reflection loss (s11) measurement off Ch0 with the antenna connected.
You can choose SWR if you like (scalar measurement of the reflection
loss). The Smith Chart tells you more, but you may not understand that
specific presentation of the data.
Dave - W?LEV
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On Sun, Dec 29, 2019 at 11:46 PM Kevin B <buchholz676@...> wrote: Ok I'm new to all this and I'm confused now. I am testing a vhf 1/4 wave
base antenna. I get horrible range, like a mile on simplex, 25 watts about
30 feet up... so wanted to do some testing. I set the VNA to 110-480 MHz,
line loss (think that's what it's called) and swr. See pictures. I was
expecting a dip somewhere close to where I expect it to be tuned for and
nothing. There isn't really any dips... Based on what I see the antenna is
has good swr everywhere (not possible). How is it possible for the swr to
be less than 1.5 from 110-480 MHz. Is this unit garbage or an I doing
something wrong? I'm new to these and their technology but I think I know
what I'm doing... Sorry I couldn't get clear pics...
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
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Have you performed a calibration?
Try disconnecting your antenna and you should see a high SWR.
You can also do a TDR test...
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Thanks, I'll read over calibration again to make sure I did it correct... Looks straight forward though... If not time to check coax...
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And yet again, having nothing to do with getting a 3.4 version! Which going
through Alibaba is the only way to be guaranteed to get a 3.4 at this time!
Roy
WA0YMH
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On Sun, Dec 29, 2019, 6:26 PM David M <aj4tf@...> wrote: Gigaparts is selling them.
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Like others have said it sounds like coax. Although you may want to make
sure you're NanoVna is calibrated. Mine was showing a max of 2.5:1 across
the entire HF band. Calibrating again fixed this.
If the coax is bad or has had moisture ingress it will attinuate the signal
going out and returning. Since the signal returning is attenuated, the
reflected signal will be low therefore low SWR.
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On Sun, Dec 29, 2019, 18:38 Kevin B <buchholz676@...> wrote: It should be good, its not very old and is LMR400. I will have to check it
all over I guess. I attached new pics from the windows program, would
moisture be consistent with these types of readings? I hooked an 2m HT
antenna right onto a meter and it showed what I expected, basically flat
line except a spike in the 2m band so I would say the meter is working
properly....
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It should be good, its not very old and is LMR400. I will have to check it all over I guess. I attached new pics from the windows program, would moisture be consistent with these types of readings? I hooked an 2m HT antenna right onto a meter and it showed what I expected, basically flat line except a spike in the 2m band so I would say the meter is working properly....
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Gigaparts is selling them.
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On Sun, Dec 29, 2019 at 03:34 PM, John Smith wrote:
I got one of the Hugen ones with the latest firmware, 1.5Ghz, battery diode, and shielding, for $42.99 from what seems to be a third party seller, and it took only two weeks. I saw them mentioned on here previously which is why I bought from here.
=================================================================
John,
I believe the most recent messages have been from members who want to ensure they receive the NanoVNA-H with the version 3.4 printed circuit board (see attachment). Some worthwhile performance improvements have been made. I noticed a UART port (P3) has been added for users who requested this feature (for add-on UART experimentation?). Other changes I noticed from the attached photo are a larger battery (650 mAh) and more solid connection of the sma connectors to the PCB. I can't confirm it from the photo, but I believe hugen also modified the battery management circuitry so that noise from the PC is reduced when the NanoVNA is connected to it during measurements.
- Herb
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are you sure the coax is not full of humidity?
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Le dim. 29 d¨¦c. 2019 ¨¤ 18:47, Kevin B <buchholz676@...> a ¨¦crit :
Ok I'm new to all this and I'm confused now. I am testing a vhf 1/4 wave base antenna. I get horrible range, like a mile on simplex, 25 watts about 30 feet up... so wanted to do some testing. I set the VNA to 110-480 MHz, line loss (think that's what it's called) and swr. See pictures. I was expecting a dip somewhere close to where I expect it to be tuned for and nothing. There isn't really any dips... Based on what I see the antenna is has good swr everywhere (not possible). How is it possible for the swr to be less than 1.5 from 110-480 MHz. Is this unit garbage or an I doing something wrong? I'm new to these and their technology but I think I know what I'm doing... Sorry I couldn't get clear pics...
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How old is you coax? Coax ages, becomes more lossy. When it becomes lossy, it acts like an attenuation pad. So regardless of SWR, hardly any power gets to the antenna. In addition, a poorly tuned antenna will be isolated so it does not appear to have a bad match.
This kind of loss typically gets worse with higher frequencies.
--
Steve Greenfield AE7HD
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Ok I'm new to all this and I'm confused now. I am testing a vhf 1/4 wave base antenna. I get horrible range, like a mile on simplex, 25 watts about 30 feet up... so wanted to do some testing. I set the VNA to 110-480 MHz, line loss (think that's what it's called) and swr. See pictures. I was expecting a dip somewhere close to where I expect it to be tuned for and nothing. There isn't really any dips... Based on what I see the antenna is has good swr everywhere (not possible). How is it possible for the swr to be less than 1.5 from 110-480 MHz. Is this unit garbage or an I doing something wrong? I'm new to these and their technology but I think I know what I'm doing... Sorry I couldn't get clear pics...
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I got one of the Hugen ones with the latest firmware, 1.5Ghz, battery diode, and shielding, for $42.99 from what seems to be a third party seller, and it took only two weeks. I saw them mentioned on here previously which is why I bought from here.
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Some vendors on Alibaba will accept PayPal for payment. You need to get their PayPal email address by chatting with them. Some will send you an invoice on Paypal which you pay and then they ship to you. Does anyone know if Maggie (Hugen's distributor) will do this?
I suppose the other option to use a VISA pre-paid gift card.
Roger
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I've had the same problem with Alibaba and Aliexpress, so won't deal with either of them.
Actually, the name Alibaba should be a clue - as in Alibaba and the Forty Thieves.
--
Terry VK5TM
( )
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I received a reply from Maggie King, at hugen's Alibaba store, regarding an eBay third party source for the NanoVNA-H with version 3.4 PCB.
" I am not sure. We have no eBay store now. Still working on new store. But I think you can try anyone you want on eBay. Because all new NanoVNA-H's with shell come from us. Just be aware some may have the older version pcb because they may still have some stock of our old versions.
Best regards"
So it appears until the current eBay third party stock of NanoVNA-H's with older PCB is depleted, ordering from hugen's Alibaba store is the only way to guarantee you receive the NanoVNA-H with version 3.4 PCB.
- Herb
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Sam,
No need to use such primitive methods like were necessary on 1980s micros.
STM32 MCUs have a MCU device ID code. I didn't bother to look at the
STM32F072 details, but on the STM32303 it's register DBGMCU_IDCODE
address 0xE004
2000 32-bit read-only. See the STM32F303xB/C/D/E Reference Manual for
details. I'm sure Gabriel is already aware of this because the Reference
is a constant companion for a software developer.
I used STM32F4 MCUs the last 5 years of my career before retiring in 2017.
Larry AC8YE
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On Sun, Dec 29, 2019 at 2:50 PM Sam Reaves <sam.reaves@...> wrote: If the new version has a I/O pin that normally floats or is pulled high on
the original version the same pin could be permanently tied to ground on
the new version the firmware could test for this bit and load the
appropriate option for the number of displayed points or any other
differences that need to be set.
Sam Reaves
ARS W3OHM
Owner and Moderator of:
LeCroy Owners Group on Groups.io (Current and Future Group)
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John Smith
Roger Need
Larry - AC8YE