[aprssig] APRS-B SRD? (freq)

Robert Bruninga bruninga at usna.edu
Mon Jun 24 10:52:05 CDT 2013


> So pick a ham freq and approach a manufacturer

> However in practice, you will become very unpopular in your neighborhood
if you start actively using that frequency

The radio chips as-is are programmable anywhere in the UHF band.  So we
need to go look at the 100 KHz channels set aside (and unused presently)
for packet...  My guess is just keying up any existing HAM radio in the
UHF band will likely block these keychain receivers until the ham stops
transmitting, since they cant have very good filters on a postage stamp.

Thanks for the reminder...
Bob


Sent from my iPhone
Andrew Rich

On 25/06/2013, at 1:31 AM, PE1RDW <aprs at pe1rdw.demon.nl> wrote:

> On Mon, 24 Jun 2013 16:53:47 +0200, Steve Noskowicz
<noskosteve at yahoo.com> wrote:
>
>> I have 433.900 in an HT memory.  I haven't looked into these carefully,
but ... Could there be an issue with all the remote wireless weather
sensors and whatever else I hear constantly beeping, bleeping and squaking
on the Part 15 frequency  433.900
>>
>> 73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)
> It's a 2 part question, legally these devices at least in Europe have no
protection and operating at 10 mW eirp they are easily blasted aside.
> However in practice, you will become very unpopular in your neighborhood
if you start actively using that frequency because not only wireless
sensors are there but at least in Europe cheaper car alarms operate there
too and no car with one of those installed will be able to start when you
are transmitting (first hand experience when I was experimenting with
wideband fm there) one of the biggest problems of SRD uses is that there
are no rules for the recievers so they will lock on any strong signal
within 100 khz so even retuning these things a bit won't help if you plan
on adding an external amp
>
> --
> 73 Andre PE1RDW
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