That's great Barry, thanks for the info.
I hope to fix it up later tonight.
73"s
de Andy
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On Tue, Jun 11, 2013 6:25 AM PDT Barry Chambers wrote:
On 10/06/2013 18:27, Andy Cutland wrote:
Hi Barry,
My up501 has just arrived from taiwan and am eager not to blow this
one up !
Did you place any resistors on the unit and if so what value did you
use. I will be supplying the unit from a dedicated 3.3v reg supply. Am
I right in thinking that pin 4 and 5 can be connected together (vdd
and vdd b) ?
73's
De Andy
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*From:* Barry Chambers <b.chambers@...>
*To:* QRPLabs@...
*Sent:* Friday, May 31, 2013 12:18 PM
*Subject:* Re: [QRPLabs] GPS behaviour very inconsistent
Afternoon All
For several weeks, I've been struggling to get my U2 kit working with a
EM-406A GPS module. The problem seems to be with the 1pps signal. as the
NEMA data is read correctly.
Today, I got through the post a Fastrax (Reyax) UP501 GPS module (from
Taiwan via E-Bay, ?17, about 10 days delivery time). Hans lists this
module on the U2 kit web pages. It requires a 3.3v supply and the modem
setting is 09600,10,1,8. Hey presto! It works! I found that the "Inv
GPS" setting needs to be "On". The clock keeps perfect time (as compared
against my wireless clock), the Locator is set correctly and the DDS
125MHz oscillator frequency is corrected (mine is now slightly lower
than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and
the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of
wire about 15cm long, joined by a 47R resistor.
73
Barry, G8AGN
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Andy
I didn't use any pull-up resistors. I connected GPS pins 4 and 5
together and fed them from a 3.3v regulator ( TS2950CT-3.3, N68CA from
Maplin).
GPS pin 1 was left floating.
In the U2 menu, "Inv GPS" should be set "On".
Once a 3D fix has been obtained, the clock should run correctly
(including the seconds). When using the WSPR mode, the Maidenhead
location should be correct for your location and the DDS frequency
should be slightly different from the default of 125,000,000.
Hope this helps.
--
73
Barry, G8AGN
