NMT-450 - partial success

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Ralph A. Schmid, dk5ras ralph at schmid.xxx
Mon Oct 26 14:33:54 UTC 2020


One thing, maybe your MCR has drifted, due to ageing?! 

 

From: OpenBSC [mailto:openbsc-bounces at lists.osmocom.org] On Behalf Of Sipos Csaba
Sent: Monday, October 26, 2020 3:16 PM
To: openbsc-request at lists.osmocom.org <openbsc at lists.osmocom.org>
Subject: Fwd: NMT-450 - partial success

 

Hi,

 

I know it is a bit off topic, but as osmocom-analog has no dedicated mail list and my every attempt to contact Andreas lead to silence, I thought this is the closest one to discuss it.

 

I try to create an NMT-450 network with Motorola MCR4800XL phones, and a LimeSDR-mini. As the phones are locked to "Hungary" using a specific raster and a large gap in the middle, first I needed to dig out the details, find out the country code and create a patch so at least the phone is willing to lock onto the DS signal. I managed to do all that, so now the phone is actually able to decode the network and lock onto the signal.

 

My issue is with the uplink: when the phone tries Traffic Area update (the phone's uplink transmission burts is clearly seen with a spectrum analyzer), the network side is not able to detect the uplink burst at all. Not even as bad, or incorrectly formatted frame. Andreas has a site which describes how to set up the uplink side and do some tests: 

 

http://osmocom-analog.eversberg.eu/docs/sdr.html

 

I followed that guide and when the uplink burst from the phone arrives, the RX IQ constellation monitor indicates a correct burst with proper power (the burst is nicely round and in the green area). If I try to set up a call to the phone using the correct country code and phone number, the phone clearly responds to the paging request, as the 3 paging attempt generates 3 uplink bursts. Again, with no reception/decoding on the network side. Tried with two phones of the same type, the effect is the same.

 

I have two questions:

 

1. Where to send patches for the osmocom-analog project?

2. Does anyone have an idea what can be wrong with my setup?

 

One more thing I noticed: compared to the channel frequency used to set the NMT network up, the uplink is a couple kHz shifted:

 

http://www.imagebam.com/image/d17e881357285965

 

As it can be seen, the uplink burst appears 3-4kHz left relative to the downlink signal. 

 

The network is started with the following command:

nmt -k 239 -k 235 -Y HU,1 --limesdr-mini --sdr-rx-gain 20

 

Any and all help is appreciated.

 

Regards,

Csaba

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