Hi,<br /><br />&gt; Ah, good.  It looks like you had to change trf6151_pll_tx() quite a bit.<br />&gt; Is there anything there that you are unsure of?  Something I can test?<br /><br />No, I looked at it again this morning and it looks fine.<br /><br />You can try to enable the warning (define at the top of the file)<br />It shouldn&#39;t throw any (check that DCS is disabled in your mobile config or else it will throw some when doing power measurement in a bad band for your phone).<br /><br /><br />&gt; &gt; But obviously I couldn&#39;t test with a real BTS (because I&#39;m not in the US<br />&gt; &gt; and the racal 6103e doesn&#39;t support GSM850)<br />&gt; <br />&gt; I&#39;ll experiment with OpenBTS and try both GSM900 and GSM850<br />&gt; configurations.<br /><br />Ah yes, I guess I could test with OpenBTS as well.<br /><br /><br />&gt; Well, I can monitor the uplink frequency and compare the signal<br />&gt; amplitude between the standard Motorola firmware and the osmocom code.<br />&gt; If there is still a weak signal problem, it should be fairly obvious.<br /><br />Yes, but with _fft software alone it&#39;s not easy because RACH is very short and so what you see on the screen is not really the power.<br />A real analyzer can be set to trigger on power level to capture &#39;only&#39; the RACH and analyze the power in that.<br /><br />A time graph might work tough. (or possibly waterfall with a very short fft size).<br /><br /><br />&gt; If you have any other ideas, I&#39;d be glad to test them out.  I&#39;ll at<br />&gt; least try the above and figure out how strong the tx signal is.  Not<br />&gt; sure what I can do after that though.<br /><br />You can look at the parameter chosen in the trf pll settings (A / B / Band) and post them here along with the ARFCN so I can check if they&#39;ve been selected correctly.<br /><br />I don&#39;t have much other ideas.<br /><br />Cheers,<br /><br />    Sylvain