Bob wrote: Sitting here casually reading the data sheets for some of the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first. The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are made
to, or by who. In my former place of employment, we made an SMB terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We tried
to get the supplier to sell them to us packaged in bulk, but they refused.
We decided that they were actually buying them from someone else and just
doing a passthru. The connectors themselves would change from time to time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Hi
China does a lot of things through a marketplace process. Lots of guys with
piles of this or that. Any sort of product you get in (to them) small volume
likely goes through this kind of arrangement. Buying OCXO’s and other
timing gear is every bit as vulnerable to the “this one today, something
different tomorrow” process that results.
This sort of process is also vulnerable to the “grabbed the wrong box” problem.
The good ones are in this box and the others are in that box. I’m in a hurry
and ….
It’s well worth remembering that we are (or should be) paying a very low price
for most of this stuff. It is unfortunate that paying a higher price does not
seem to guarantee a better outcome.
Bob
On Feb 13, 2018, at 8:00 AM, John Green wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first. The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are made
to, or by who. In my former place of employment, we made an SMB terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We tried
to get the supplier to sell them to us packaged in bulk, but they refused.
We decided that they were actually buying them from someone else and just
doing a passthru. The connectors themselves would change from time to time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Sounds like a drop shipping operation, they've found a supplier in China
who is willing to send goods either in plain wrapping without any supplier
name or the name of the agent who's selling it. It can be useful to Google
anything that looks like a part number on the packaging, you'll often find
the main wholesaler or even the manufacturer.
On 13 Feb 2018 15:48, "John Green" wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first. The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are made
to, or by who. In my former place of employment, we made an SMB terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We tried
to get the supplier to sell them to us packaged in bulk, but they refused.
We decided that they were actually buying them from someone else and just
doing a passthru. The connectors themselves would change from time to time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Hi
That can be a bit harder if the labels are all in Chinese. Maybe posting
pictures of the label? That way those (not I) who can read Chinese might
spot something that allows a search to proceed.
Bob
On Feb 13, 2018, at 11:06 AM, Clint Jay cjaysharp@gmail.com wrote:
Sounds like a drop shipping operation, they've found a supplier in China
who is willing to send goods either in plain wrapping without any supplier
name or the name of the agent who's selling it. It can be useful to Google
anything that looks like a part number on the packaging, you'll often find
the main wholesaler or even the manufacturer.
On 13 Feb 2018 15:48, "John Green" wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first. The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are made
to, or by who. In my former place of employment, we made an SMB terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We tried
to get the supplier to sell them to us packaged in bulk, but they refused.
We decided that they were actually buying them from someone else and just
doing a passthru. The connectors themselves would change from time to time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Agreed but stock numbers on boxes and packets are usually Arabic numerals
or a barcode. It's also possible the seller used a stock image which can be
copied and pasted into Google web search to track down the maker or at
least a distributor who has data.
On 13 Feb 2018 16:18, "Bob kb8tq" kb8tq@n1k.org wrote:
Hi
That can be a bit harder if the labels are all in Chinese. Maybe posting
pictures of the label? That way those (not I) who can read Chinese might
spot something that allows a search to proceed.
Bob
On Feb 13, 2018, at 11:06 AM, Clint Jay cjaysharp@gmail.com wrote:
Sounds like a drop shipping operation, they've found a supplier in China
who is willing to send goods either in plain wrapping without any
supplier
name or the name of the agent who's selling it. It can be useful to
anything that looks like a part number on the packaging, you'll often
find
the main wholesaler or even the manufacturer.
On 13 Feb 2018 15:48, "John Green" wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of
the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first.
The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are
made
to, or by who. In my former place of employment, we made an SMB
terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB
connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We
tried
to get the supplier to sell them to us packaged in bulk, but they
refused.
We decided that they were actually buying them from someone else and
just
doing a passthru. The connectors themselves would change from time to
time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification
from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Oh, and Google has a handy translation tool which does a reasonable job of
translating Chinese text from a jpg image so that's also worth a try.
On 13 Feb 2018 16:18, "Bob kb8tq" kb8tq@n1k.org wrote:
Hi
That can be a bit harder if the labels are all in Chinese. Maybe posting
pictures of the label? That way those (not I) who can read Chinese might
spot something that allows a search to proceed.
Bob
On Feb 13, 2018, at 11:06 AM, Clint Jay cjaysharp@gmail.com wrote:
Sounds like a drop shipping operation, they've found a supplier in China
who is willing to send goods either in plain wrapping without any
supplier
name or the name of the agent who's selling it. It can be useful to
anything that looks like a part number on the packaging, you'll often
find
the main wholesaler or even the manufacturer.
On 13 Feb 2018 15:48, "John Green" wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of
the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first.
The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are
made
to, or by who. In my former place of employment, we made an SMB
terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB
connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We
tried
to get the supplier to sell them to us packaged in bulk, but they
refused.
We decided that they were actually buying them from someone else and
just
doing a passthru. The connectors themselves would change from time to
time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification
from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Hi
On Feb 13, 2018, at 12:06 PM, Clint Jay cjaysharp@gmail.com wrote:
Agreed but stock numbers on boxes and packets are usually Arabic numerals
or a barcode. It's also possible the seller used a stock image which can be
copied and pasted into Google web search to track down the maker or at
least a distributor who has data.
The seller did post a number of images for the part that was listed. The gotcha is
that the part that arrived is not labeled the same way as the part that was listed.
Since the device also has issues, the big question is if it has any connection to
the part in the listing at all.
The seller seems to have been doing GPS stuff for a while. He also has a very
good approval rating. My guess is: this isn’t the first time he’s seen a bump in
the road. I’d bet he’s got the ability to check this and that out to see what is what.
The seller does matter when you buy this stuff. That’s true no matter what you
are getting. No matter how good they are, problems do come up. The question
is always how well they address them. We tend to dump pretty hard on these
guys. I’m not sure that’s always warrantied.
Bob
On 13 Feb 2018 16:18, "Bob kb8tq" kb8tq@n1k.org wrote:
Hi
That can be a bit harder if the labels are all in Chinese. Maybe posting
pictures of the label? That way those (not I) who can read Chinese might
spot something that allows a search to proceed.
Bob
On Feb 13, 2018, at 11:06 AM, Clint Jay cjaysharp@gmail.com wrote:
Sounds like a drop shipping operation, they've found a supplier in China
who is willing to send goods either in plain wrapping without any
supplier
name or the name of the agent who's selling it. It can be useful to
anything that looks like a part number on the packaging, you'll often
find
the main wholesaler or even the manufacturer.
On 13 Feb 2018 15:48, "John Green" wpxs472@gmail.com wrote:
Bob wrote: Sitting here casually reading the data sheets for some of
the
modern Trimble
survey receivers - they have gone to 7.2V (just below your 7.5V trigger
point)
as an antenna supply voltage.
Who knows what that might imply relative to this antenna.
After getting my refund, I sent the seller a message saying that I would
buy another if he could assure me it would work at 12 volts. He replied
that he needed to get his hands on a couple and do some testing first.
The
antenna that I received seems to be different to the one pictured in the
eBay listing. At least the labels are different. I get the feeling he is
kind of a third party dealing with someone in China who is wholesaling
antennas made by someone else. Who really knows what spec. these are
made
to, or by who. In my former place of employment, we made an SMB
terminator.
Basically, a 75 ohm resistor soldered across the pins of an SMB
connector,
then molded in black plastic. We bought the connectors from a Chinese
supplier who supplied them in individual plastic bags. We had to cut the
parts out of the bags before processing, which added a labor step. We
tried
to get the supplier to sell them to us packaged in bulk, but they
refused.
We decided that they were actually buying them from someone else and
just
doing a passthru. The connectors themselves would change from time to
time,
which caused problems in molding, and sometimes caused the electrical
performance to degrade. Getting parts to reliably meet a specification
from
China can be a problem. I can't even imagine the issues that could arise
when you try to source an assembly, or completed product.
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Learned tonight that J. P. Morgan got his start by buying 25 K defective
rifles for %3.50 each and selling them to the Army for $25 each. You
have no reason to trust a listing.
Bill Hawkins
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Bob
kb8tq
Sent: Tuesday, February 13, 2018 12:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] eBay GPS antenna test.
Hi
On Feb 13, 2018, at 12:06 PM, Clint Jay cjaysharp@gmail.com wrote:
Agreed but stock numbers on boxes and packets are usually Arabic
numerals or a barcode. It's also possible the seller used a stock
image which can be copied and pasted into Google web search to track
down the maker or at least a distributor who has data.
The seller did post a number of images for the part that was listed. The
gotcha is that the part that arrived is not labeled the same way as the
part that was listed.
Since the device also has issues, the big question is if it has any
connection to the part in the listing at all.
The seller seems to have been doing GPS stuff for a while. He also has a
very good approval rating. My guess is: this isn't the first time he's
seen a bump in the road. I'd bet he's got the ability to check this and
that out to see what is what.
The seller does matter when you buy this stuff. That's true no matter
what you are getting. No matter how good they are, problems do come up.
The question is always how well they address them. We tend to dump
pretty hard on these guys. I'm not sure that's always warrantied.
Bob
Hi
Just so people don’t get to down on eBay antennas:
https://www.ebay.com/itm/Antcom-Active-L1-L2-Choke-Ring-Antenna-Item-123GM1215A-XT-1-AUTOFARM-AGLEADER/302630180910?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 https://www.ebay.com/itm/Antcom-Active-L1-L2-Choke-Ring-Antenna-Item-123GM1215A-XT-1-AUTOFARM-AGLEADER/302630180910?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
Was indeed brand new in box. The pictures don’t quite give credit to the branding
on the antenna. It was shipped directly from the outfit that put the great big
letters on it. Price was a bit less than eBay would have you think, but still a bit
more than the ones from China. No idea if they will be selling any more.
An L1 / L2 choke ring is a much better bet pattern wise than the patch antennas. It also is a
great big heavy monster of a thing to mount somewhere ….
On the down side, like a lot of what you see, it’s GPS only. At least by spec, it will
not pass the full Glonass L1 or L2 bands. That may be why it turned up as “brand new but
we’re unloading it”. What the passband really looks like ….. we’ll see ….
Bob
On Feb 14, 2018, at 12:23 AM, Bill Hawkins bill.iaxs@pobox.com wrote:
Learned tonight that J. P. Morgan got his start by buying 25 K defective
rifles for %3.50 each and selling them to the Army for $25 each. You
have no reason to trust a listing.
Bill Hawkins
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Bob
kb8tq
Sent: Tuesday, February 13, 2018 12:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] eBay GPS antenna test.
Hi
On Feb 13, 2018, at 12:06 PM, Clint Jay cjaysharp@gmail.com wrote:
Agreed but stock numbers on boxes and packets are usually Arabic
numerals or a barcode. It's also possible the seller used a stock
image which can be copied and pasted into Google web search to track
down the maker or at least a distributor who has data.
The seller did post a number of images for the part that was listed. The
gotcha is that the part that arrived is not labeled the same way as the
part that was listed.
Since the device also has issues, the big question is if it has any
connection to the part in the listing at all.
The seller seems to have been doing GPS stuff for a while. He also has a
very good approval rating. My guess is: this isn't the first time he's
seen a bump in the road. I'd bet he's got the ability to check this and
that out to see what is what.
The seller does matter when you buy this stuff. That's true no matter
what you are getting. No matter how good they are, problems do come up.
The question is always how well they address them. We tend to dump
pretty hard on these guys. I'm not sure that's always warrantied.
Bob
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