We are currently running the UMTS transmission path test as described in the “AirPrime MC7430 Product Technical Specification & Customer Design Guidelines” pdf.
We ran a similar test in the past for the MC7304 and MC7354 and using the AT!DAWSPARANGE=3 command we saw a change in the power.
On the MC7430, this command seems to have no effects…
Was there any changes in the MC74xx series that might have affected this?
We are following the steps as descried in the document.
Hi,
What firmware are you running on the unit and what is the full procedure you are using?
Regards
Matt
Hi,
We are using SWI9X30C_02.14.03.00.
We are doing the exact same procedure as described in the “UMTS (WCDMA) RF Transmission Path Test” section of the documents, which is :
The ultimate aim here is to change the RF power coming out of the module regardless of this command, are you able to do this? The MC73 and MC74 are completely different it might be that the PA does need to be set to high power.
I don’t have a spectrum analyser to hand to check it right now.
Regards
Matt
No we are not able to do this.
I believe setting the DAWSPARANGE=3 sets it to high gain.
Also the command AT!DASPDM=2, 75 also seems to have no effect. We see no change in power.
Shang,
Re the DAWSPARANGE=3 command, yes in theory it does set it to high power but I am wondering if the unit needs the PA to be set.
So are you just using a power meter? I will try to to a test against a spectrum analyser tomorrow.
Regards
Matt
Hi,
I have run the attached teraterm script against an MC7455 and it works with 3G as per the attached screen shot, the received power is reasonable given the number of connectors I had between the spectrum analyser and the MC74 itself. I am working on getting LTE working as it does not seem to be playing ball at the moment, will update you when I do get it working.
Regards
Matt
Which firmware were you using?
Thank you
Hi,
I am using 2.13 (release 13), you need to be on release 12+ to be current with regards a lot of things.
Re getting it working, I am talking to the RF guys as I am not entirely sure I am correct on what I have said.
Regards
Matt
Shang,
I have it on good authority that the below will work with LTE band 1.
AT!ENTERCND=“A710”
OK
AT!DAFTMACT
290300 (290300 needed, otherwise send AT!RESET and try again the above commands)
OK
AT!DASBAND=34 (LTE Band 1 selection)
0
OK
AT!DALSTXBW=3 (10MHz bandwidth selection)
OK
AT!DALSRXBW=3 (10MHz RX bandwidth selection)
OK
AT!DASCHAN=18300 (Uplink 18300 channel selection, 1950MHz)
18176 (response is 18176, whatever the requested channel)
OK
AT!DASTXON
OK
AT!DALSWAVEFORM=1,50,10,0 (PUSCH signal (0=CW), 50 PUSCH resource blocks, 10 PUCCH resource blocks, start RB index 0)
OK
AT!DALSPARANGE=0 (PA set to high power, 1 is for low power)
0
OK
AT!DALSTXINDEX=90 (set the transmit power)
OK
A +23dBm, 1950MHz, LTE modulated signal is generated
The signal power may be slightly different from +23dBm as the INDEX value is a raw uncalibrated command.
The 3G power level seems to be linked to the AGC value you set using the at!dawstxpwr command but I cannot test this at the moment but give it a go.
Regards
Matt
