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'[OTish] Has anyone used the MICRF001 from MICREL?'
1998\11\18@001630 by Gabriel Gonzalez

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Hi All,

I just received samples of the MICRF001, (a QwickRadio RF
Receiver/Demodulator).
It looks like an interesting IC, it only needs 4 external components (two
caps, a crystal and the antenna. In the handbook for this IC comes several
examples, even one with a PIC.

My question is regarding the transmitter, has anyone built one for this IC?

I was thinking on using (hacking) one of those keychain transmitter from a
car alarm, at least to conduct some tests.

Any ideas??

TIA

Best regards,

Calvin

1998\11\18@015745 by Ian Rozowsky

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I've got samples too. I'm looking at using it in a low cost
application. However, I have some concerns regarding the modes of
operation. If a ceramic resonator is used to set the frequency, it
seem that the device must work in the "SCAN" mode, which effectively
increases the bandwidth, and leaves you with a super-regen type
scenario. In order to get a narrower bandwidth, a crystal is required
to set the frequency. This pushes the price up.

Super-regen can possibly be  achieved in a less expensive fashion
through using the readily available hybrid type modules.

I'm keen to prototype a MICRF001 system anyway, if only to determine
whether the chip is as easy to use as Micrel claim. (no antenna
matching required if antenna is local, etc..). I'm still a  bit
sceptical of these type of claims.
Ian Rozowsky
Development Engineer
Centurion Systems
Box 506 Cramerview 2060 South Africa
Tel   : +27-11-708-2680
Fax   : +27-11-708-2630
e-mail: spam_OUTrozTakeThisOuTspamcentsys.co.za

1998\11\19@001723 by Henry Carl Ott

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At 09:51 PM 11/17/98, you wrote:
>Hi All,
>
>I just received samples of the MICRF001, (a QwickRadio RF
>Receiver/Demodulator).
--snip-----

>My question is regarding the transmitter, has anyone built one for this IC?
>
>I was thinking on using (hacking) one of those keychain transmitter from a
>car alarm, at least to conduct some tests.
>
>Any ideas??


   Most of the better (stable) keychain transmitter use a saw module in
the 300-400mhz range.

  You can get some design notes by going to the rf monolithics website
http://www.rfm.com.
Look for appnote # trdesap.pdf for some specific details.
If you actually need saw modules, digikey sells some @ specific frequencies.

  Good luck, and let us know if you get a good rf link established with
the MICR001.



carl

--------------------------------------------------------
Henry Carl Ott   N2RVQ    .....carlottKILLspamspam@spam@interport.net
http://www.interport.net/~carlott/
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BOIL that dust speck! BOIL that dust speck!

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