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Hi Barry,

Well I fired it up this morning but couldn't get anything out of it. Not sure if it was able to get a fix from where the unit is located so I will take the whole thing outside to give it a chance to see some satellites.

I checked the feed voltage and that was a stable 3.3v. The earth checked out fine too so I hope all will be good once a fix is made.

Here's hoping !

73's
De Andy

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From: Andy Cutland
To: qrplabs@...
Sent: Tuesday, June 11, 2013 3:31 PM
Subject: Re: [QRPLabs] GPS behaviour very inconsistent

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That's great Barry, thanks for the info.

I hope to fix it up later tonight.

73"s
de Andy

------------------------------
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
>>
>>
>> ----------------------------------------------------------
>> *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
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>> QRPLabs-fullfeatured@...>
>>
>>
>>
>>
>>
>
>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
>

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73

Barry, G8AGN