I recently fitted a reversing camera and screen to the people
carrier. The idea was to use wireless coupling between camera and
screen. It failed, as the wireless range was in the region of 10 ft in
free air. Anyway with much cursing I hard wired the video in the car and
put the wireless bits on one side for further investigation. I found
this week, when I checked the transmission frequency of the transmitter
that it was putting out 3.69GHz, which I believe is outside the 2,4GHz
band. I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.
Does anyone have any experience of this type of off frequency problem?
The antenna length is 38mm, which seems a bit long but may be based on
experience. I can't find any references to people using 2.37GHz for
video sending, anyone know otherwise? The unit is Xtal controlled.

Capitol wrote:

when I checked the transmission frequency of the transmitter that it
was putting out 3.69GHz, which I believe is outside the 2,4GHz band.
I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.

Neither of them are remotely close to the 2.4GHz or 5.8GHz sanctioned
ISM bands, grey imports using "dodgy" frequencies?

I wonder if anyone ever checks these and in fact what the out of band
frequencies are allocated to. All I do know is that there are now so many
items in the band that you can hardly use wifi very far at allany more as
the back channel from the device is swamped by the interference from all the
others in an area.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Andy Burns" wrote in message
...
Capitol wrote:

when I checked the transmission frequency of the transmitter that it
was putting out 3.69GHz, which I believe is outside the 2,4GHz band.
I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.

Neither of them are remotely close to the 2.4GHz or 5.8GHz sanctioned ISM
bands, grey imports using "dodgy" frequencies?

Andy Burns wrote:
Capitol wrote:

when I checked the transmission frequency of the transmitter that it
was putting out 3.69GHz, which I believe is outside the 2,4GHz band.
I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.

Neither of them are remotely close to the 2.4GHz or 5.8GHz sanctioned
ISM bands, grey imports using "dodgy" frequencies?

Sorry, error. 2.41GHz.

In article , Capitol
scribeth thus
I recently fitted a reversing camera and screen to the people
carrier. The idea was to use wireless coupling between camera and
screen. It failed, as the wireless range was in the region of 10 ft in
free air. Anyway with much cursing I hard wired the video in the car and
put the wireless bits on one side for further investigation. I found
this week, when I checked the transmission frequency of the transmitter
that it was putting out 3.69GHz, which I believe is outside the 2,4GHz
band. I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.
Does anyone have any experience of this type of off frequency problem?
The antenna length is 38mm, which seems a bit long but may be based on
experience. I can't find any references to people using 2.37GHz for
video sending, anyone know otherwise? The unit is Xtal controlled.

Take it your using a rectum speccylyser for those measurements?....
--
Tony Sayer

tony sayer wrote:
In , Capitol
scribeth thus

I recently fitted a reversing camera and screen to the people
carrier. The idea was to use wireless coupling between camera and
screen. It failed, as the wireless range was in the region of 10 ft in
free air. Anyway with much cursing I hard wired the video in the car and
put the wireless bits on one side for further investigation. I found
this week, when I checked the transmission frequency of the transmitter
that it was putting out 3.69GHz, which I believe is outside the 2,4GHz
band. I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.
Does anyone have any experience of this type of off frequency problem?
The antenna length is 38mm, which seems a bit long but may be based on
experience. I can't find any references to people using 2.37GHz for
video sending, anyone know otherwise? The unit is Xtal controlled.

Take it your using a rectum speccylyser for those measurements?....


Hell, I really fouled up that post didn't I? Readings were
2.369GHz and 2.41 GHZ!

In article , Capitol
scribeth thus
tony sayer wrote:
In , Capitol
scribeth thus

I recently fitted a reversing camera and screen to the people
carrier. The idea was to use wireless coupling between camera and
screen. It failed, as the wireless range was in the region of 10 ft in
free air. Anyway with much cursing I hard wired the video in the car and
put the wireless bits on one side for further investigation. I found
this week, when I checked the transmission frequency of the transmitter
that it was putting out 3.69GHz, which I believe is outside the 2,4GHz
band. I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.
Does anyone have any experience of this type of off frequency problem?
The antenna length is 38mm, which seems a bit long but may be based on
experience. I can't find any references to people using 2.37GHz for
video sending, anyone know otherwise? The unit is Xtal controlled.

Take it your using a rectum speccylyser for those measurements?....


Hell, I really fouled up that post didn't I? Readings were
2.369GHz and 2.41 GHZ!

;!..

I don't suppose we know the country of origin other than the far east
and who knows what frequency they might use there?. I do know thy use
around 3.65 "ish" Ghz in the states for short range links...

--
Tony Sayer

On 18/06/16 21:28, tony sayer wrote:
In article , Capitol
scribeth thus
tony sayer wrote:
In , Capitol
scribeth thus

I recently fitted a reversing camera and screen to the people
carrier. The idea was to use wireless coupling between camera and
screen. It failed, as the wireless range was in the region of 10 ft in
free air. Anyway with much cursing I hard wired the video in the car and
put the wireless bits on one side for further investigation. I found
this week, when I checked the transmission frequency of the transmitter
that it was putting out 3.69GHz, which I believe is outside the 2,4GHz
band. I checked the frequency counter with another sender operating on
channel 1 and came up with 4.1GHz, which is in the right ball park.
Does anyone have any experience of this type of off frequency problem?
The antenna length is 38mm, which seems a bit long but may be based on
experience. I can't find any references to people using 2.37GHz for
video sending, anyone know otherwise? The unit is Xtal controlled.

Take it your using a rectum speccylyser for those measurements?....


Hell, I really fouled up that post didn't I? Readings were
2.369GHz and 2.41 GHZ!

;!..

I don't suppose we know the country of origin other than the far east
and who knows what frequency they might use there?. I do know thy use
around 3.65 "ish" Ghz in the states for short range links...

Oddly enough 2.4Ghz is an international standard arrived at by mutual
agreement, not enforced by the EU...


--
No Apple devices were knowingly used in the preparation of this post.