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PICList Thread
'experience with RF modules [OT]'
1998\12\02@053803 by Peter Grey

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At 09:10 AM 2/12/98 +0000, you wrote:

I have looked at the recent postings on RF modules. I have offered some of
the Pan Atlantic radios to some users but am awaiting on stocks.

Like a number of PIC people I am not an RF engineer. I require a transceiver
which has the following:

1. It should be approved for the country in which I am going to operate. It
is ok for a hobbly to play around with radio but if producing something for
sale it must be approved or the FCC or similar will have something to say!!
The INDIGO radio has been tested and approved by the FCC.

2. It should require a minimum of parts to make it work. The INDIGO radio
only requires a 5 volt supply to start operating. The antenna is supplied
with the radio. You can run a PIC directly into it going up to 4800 baud.
(newer models will be able to do some 30Kbaud.) To connect directly into a
PC just add a serial chip- Max203/232, etc.

3. It should not require any special RF knowledge to operate the device.
There are different modes built into the PIC16F84 which controls the radio.
It can be put in various repeater modes, PING-PONG mode for range checking,
a straight-through mode for PWM, etc; a send with error check; a send with
no error check. Thus the radio can be easily set up to check range and then
set up again in the operating mode with a minimum of effort.

4. It should be small, compact and light. The indigo is about the size of a
postage stamp and very light.

5. The range should be sufficient for most tasks. The range of the INDIGO
radio is about 150-200 metres but this is expected to increase with the new
modules.

There are a number of radios I have used but usually they fail one of the
above criteria. I have purchased some from RF Solutions but have not used
them yet. However, I doubt if I would use them in a commercial product. This
is because I do not have the equipment to test them and ensure they conform
to the regulations. I also do not want to pay to have them tested and I am
in no way qualified to perform these tests. The INDIGO radios operate at
915MHz which is suitable for both the USA, Australia and, I believe a number
of other countries. I have used teh RADIOMETRIX radios and find them very
good but it is very intensive on the use of port pins (9 needed) whereas the
INDIGO can just use RF232 in and OUT.

My apologies for going on too much. If anyone would like additional details
email me privately.


Peter Grey
Australia

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1998\12\02@064917 by Peter Williamson

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Peter

I am interested in these modules. Where can I get some info
(tech,pricing,suplier etc)

Peter Grey wrote:
{Quote hidden}

--
Peter Williamson | Phone: +61 15 898934
Waybeat Pty Ltd  | Email: spam_OUTpeterwTakeThisOuTspamwaybeat.com.au

1998\12\02@073721 by Nigel Orr

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At 21:29 02/12/98 +1100, you wrote:
>(newer models will be able to do some 30Kbaud.) To connect directly into a

Interesting- what price band will these newer models be in?

>5. The range should be sufficient for most tasks. The range of the INDIGO
>radio is about 150-200 metres but this is expected to increase with the new
>modules.

Is there a UK-approved system?  What frequency does it operate at?

>above criteria. I have purchased some from RF Solutions but have not used
>them yet. However, I doubt if I would use them in a commercial product. This
>is because I do not have the equipment to test them and ensure they conform
>to the regulations. I also do not want to pay to have them tested and I am
>in no way qualified to perform these tests.

This one puzzles me... the RF Solutions units are type-approved in the UK
(MPT1340), so wouldn't require any further testing, as long as the antenna
is constructed within the simple limits shown in the data sheets.  Any
commercial product will require EMC testing to get it's CE mark, so I don't
understand the problem- is this purely as US issue?

>My apologies for going on too much. If anyone would like additional details
>email me privately.

I thought others on the list might have similar questions...

Nigel
--
Nigel Orr                  Research Associate   O   ______
       Underwater Acoustics Group,              o / o    \_/(
Dept of Electrical and Electronic Engineering     (_   <   _ (
    University of Newcastle Upon Tyne             \______/ \(

1998\12\02@201109 by Peter Grey

picon face
At 12:34 PM 2/12/98 +0000, you wrote:
>At 21:29 02/12/98 +1100, you wrote:
>>(newer models will be able to do some 30Kbaud.) To connect directly into a
>
>Interesting- what price band will these newer models be in?

This is not firm yet but it is anticipated at about US$97

>>5. The range should be sufficient for most tasks. The range of the INDIGO
>>radio is about 150-200 metres but this is expected to increase with the new
>>modules.
>
>Is there a UK-approved system?  What frequency does it operate at?

There is only FCC testing done. Frequency is 916.5MHz

{Quote hidden}

Sorry I cannot speak too much on the US issue as I am in Australia. However,
my understanding is that testing is done with the antenna that is to be used
and you are not allowed to use any antenna. In Australia the fact that it
has been tested by the FCC means that we will have little problem in testing
here.
What I was alluding to is that the radio as supplied is true "plug & play"
and does not require an antenna to be made or protocol to be added. You just
need to put serial RS232 in and get teh same format out. (If going to a PC
then the levels would need conversion to +/- volts.

>>My apologies for going on too much. If anyone would like additional details
>>email me privately.
>
>I thought others on the list might have similar questions...




good luck,


Peter
>Nigel
>--
>Nigel Orr                  Research Associate   O   ______
>        Underwater Acoustics Group,              o / o    \_/(
>Dept of Electrical and Electronic Engineering     (_   <   _ (
>     University of Newcastle Upon Tyne             \______/ \(
>
>

1998\12\05@103937 by Gary Chung

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Me too.

Gary

Peter Williamson wrote:

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at
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