MC7455 frequent disconnections mystery

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FraCanTob
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MC7455 frequent disconnections mystery

Post by FraCanTob »

Hello all,
Nice that the forum is back up!

I've been running a setup with an MC7455 and Sprint service in MA, USA using r.ispsn connected to a Linksys WRT-1900AC v1 running since about 2017. It's been mostly reliable. I'm running GoldenOrb-2019-01-13 on the router ( GO-2019-03-10 didn't work for me--wireless wasn't working for some reason).

However, recently (last few months?) I've noticed more frequent modem disconnects. I have it set to ping a reliable server every 10s and reconnect the modem if there's a problem. I've tried new firmware, making sure the SIM card is seated. It's on a thick 6-inch-long USB cable. Antennae should be attached correctly, though I haven't looked in a while.

Pieces of relevant logs are below (I did my best to remove irrelevant stuff). Any ideas what's causing this? Steps I can take? I'm at a loss, disconnects are too frequent. Thanks for the help!

Kernel log

Code: Select all

[169114.904086] usb 1-1: new high-speed USB device number 45 using orion-ehci
[169115.104765] usb 1-1: config 1 has an invalid interface number: 12 but max is 3
[169115.112172] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[169115.119572] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[169115.126955] usb 1-1: config 1 has no interface number 1
[169115.132377] usb 1-1: config 1 has no interface number 2
[169115.139777] qcserial 1-1:1.0: Qualcomm USB modem converter detected
[169115.146621] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB0
[169115.154133] qcserial 1-1:1.3: Qualcomm USB modem converter detected
[169115.160698] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB1
[169115.184504] cdc_mbim 1-1:1.12: cdc-wdm0: USB WDM device
[169115.190430] cdc_mbim 1-1:1.12 wwan0: register 'cdc_mbim' at usb-f1050000.usb-1, CDC MBIM, 7e:d8:5a:6e:14:5a
[169144.809650] 8021q: adding VLAN 0 to HW filter on device wwan0
[170290.547986] usb 1-1: USB disconnect, device number 45
[170290.553524] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0
[170290.561912] qcserial 1-1:1.0: device disconnected
[170290.567274] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1
[170290.575655] qcserial 1-1:1.3: device disconnected
[170290.580759] cdc_mbim 1-1:1.12 wwan0: unregister 'cdc_mbim' usb-f1050000.usb-1, CDC MBIM
[170298.338032] usb 1-1: new high-speed USB device number 46 using orion-ehci
[170298.538812] usb 1-1: config 1 has an invalid interface number: 12 but max is 3
[170298.546188] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[170298.553597] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[170298.560976] usb 1-1: config 1 has no interface number 1
[170298.566335] usb 1-1: config 1 has no interface number 2
[170298.573486] qcserial 1-1:1.0: Qualcomm USB modem converter detected
[170298.580087] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB0
[170298.587624] qcserial 1-1:1.3: Qualcomm USB modem converter detected
[170298.594226] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB1
[170298.618508] cdc_mbim 1-1:1.12: cdc-wdm0: USB WDM device
[170298.624388] cdc_mbim 1-1:1.12 wwan0: register 'cdc_mbim' at usb-f1050000.usb-1, CDC MBIM, 7e:d8:5a:6e:14:5a
[170328.166865] 8021q: adding VLAN 0 to HW filter on device wwan0
[171649.301373] usb 1-1: USB disconnect, device number 46
[171649.306974] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0
[171649.315388] qcserial 1-1:1.0: device disconnected
[171649.323891] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1
[171649.332261] qcserial 1-1:1.3: device disconnected
[171649.337317] cdc_mbim 1-1:1.12 wwan0: unregister 'cdc_mbim' usb-f1050000.usb-1, CDC MBIM
[171657.013851] usb 1-1: new high-speed USB device number 47 using orion-ehci
[171657.214913] usb 1-1: config 1 has an invalid interface number: 12 but max is 3
[171657.222345] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[171657.229773] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[171657.237203] usb 1-1: config 1 has no interface number 1
[171657.242566] usb 1-1: config 1 has no interface number 2
[171657.249945] qcserial 1-1:1.0: Qualcomm USB modem converter detected
[171657.256563] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB0
[171657.264088] qcserial 1-1:1.3: Qualcomm USB modem converter detected
[171657.270614] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB1
[171657.294250] cdc_mbim 1-1:1.12: cdc-wdm0: USB WDM device
[171657.300131] cdc_mbim 1-1:1.12 wwan0: register 'cdc_mbim' at usb-f1050000.usb-1, CDC MBIM, 7e:d8:5a:6e:14:5a
[171686.894440] 8021q: adding VLAN 0 to HW filter on device wwan0
[173011.721246] usb 1-1: USB disconnect, device number 47
[173011.726850] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0
[173011.735219] qcserial 1-1:1.0: device disconnected
[173011.740363] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1
[173011.748654] qcserial 1-1:1.3: device disconnected
[173011.753642] cdc_mbim 1-1:1.12 wwan0: unregister 'cdc_mbim' usb-f1050000.usb-1, CDC MBIM
[173019.370617] usb 1-1: new high-speed USB device number 48 using orion-ehci
[173019.571391] usb 1-1: config 1 has an invalid interface number: 12 but max is 3
[173019.578749] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[173019.586195] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
[173019.593608] usb 1-1: config 1 has no interface number 1
[173019.598970] usb 1-1: config 1 has no interface number 2
[173019.606244] qcserial 1-1:1.0: Qualcomm USB modem converter detected
[173019.612850] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB0
[173019.620332] qcserial 1-1:1.3: Qualcomm USB modem converter detected
[173019.626906] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB1
[173019.651145] cdc_mbim 1-1:1.12: cdc-wdm0: USB WDM device
[173019.657089] cdc_mbim 1-1:1.12 wwan0: register 'cdc_mbim' at usb-f1050000.usb-1, CDC MBIM, 7e:d8:5a:6e:14:5a
[173049.200894] 8021q: adding VLAN 0 to HW filter on device wwan0

System log

Code: Select all

Tue Apr  2 19:36:27 2019 user.notice MBIM Monitor: Modem 1 Connection is Down (activation state: deactivated)
Tue Apr  2 19:37:04 2019 user.notice Connection Monitor: Modem 1 Connection is Down (using Ping Test)
Tue Apr  2 19:37:12 2019 user.notice Sierra Data: AT+CSQ;+CESQ +CSQ: 99,99  +CESQ: 99,99,255,255,255,255  OK AT*CNTI=0 +CME ERROR: no network service AT!SELRAT? !SELRAT: 00, Automatic   OK AT+ECIO? +ECIO: NOT IMPLEMENTED  OK AT+RSCP? +CME ERROR: no network service AT!UMTSCHAN? !UMTSCHAN: NOT IMPLEMENTED  OK AT!GSTATUS? !GSTATUS:  Current Time:  1341		Temperature: 35 Reset Counter: 8391083		Mode:        LOW POWER MODE    OK AT!PCTEMP? Temp state: Normal Temperature: 36.00 C   OK
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.721246] usb 1-1: USB disconnect, device number 47
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.726850] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.735219] qcserial 1-1:1.0: device disconnected
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.740363] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.748654] qcserial 1-1:1.3: device disconnected
Tue Apr  2 19:37:18 2019 kern.info kernel: [173011.753642] cdc_mbim 1-1:1.12 wwan0: unregister 'cdc_mbim' usb-f1050000.usb-1, CDC MBIM
Tue Apr  2 19:37:18 2019 daemon.notice netifd: Network device 'wwan0' link is down
Tue Apr  2 19:37:18 2019 user.notice sms process: Reread SMS Messages on Modem 1
Tue Apr  2 19:37:19 2019 user.notice URL-DEBUG: hotplug (iface): action='ifdown' interface='wan1'
Tue Apr  2 19:37:19 2019 user.notice MBIM Connect: Stopping network
Tue Apr  2 19:37:19 2019 daemon.notice netifd: wan1 (20874): open failed: : No such file or directory
Tue Apr  2 19:37:19 2019 daemon.notice netifd: wan1 (20874): Command failed: Permission denied
Tue Apr  2 19:37:19 2019 daemon.notice netifd: Interface 'wan1' is now down
Tue Apr  2 19:37:19 2019 daemon.info dnsmasq[4370]: read /etc/hosts - 4 addresses
Tue Apr  2 19:37:19 2019 daemon.info dnsmasq[4370]: read /tmp/hosts/odhcpd - 1 addresses
Tue Apr  2 19:37:19 2019 daemon.info dnsmasq[4370]: read /tmp/hosts/dhcp.cfg01411c - 2 addresses
Tue Apr  2 19:37:19 2019 daemon.info dnsmasq-dhcp[4370]: read /etc/ethers - 0 addresses
Tue Apr  2 19:37:19 2019 user.notice mwan3[20873]: Using firewall mask 0x3F00
Tue Apr  2 19:37:19 2019 user.notice mwan3[20873]: Max interface count is 60
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: * Remove : 1-1 : Modem1
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: * No Modems present
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:19 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.370617] usb 1-1: new high-speed USB device number 48 using orion-ehci
Tue Apr  2 19:37:26 2019 kern.warn kernel: [173019.571391] usb 1-1: config 1 has an invalid interface number: 12 but max is 3
Tue Apr  2 19:37:26 2019 kern.warn kernel: [173019.578749] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
Tue Apr  2 19:37:26 2019 kern.warn kernel: [173019.586195] usb 1-1: config 1 has an invalid interface number: 13 but max is 3
Tue Apr  2 19:37:26 2019 kern.warn kernel: [173019.593608] usb 1-1: config 1 has no interface number 1
Tue Apr  2 19:37:26 2019 kern.warn kernel: [173019.598970] usb 1-1: config 1 has no interface number 2
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.606244] qcserial 1-1:1.0: Qualcomm USB modem converter detected
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.612850] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB0
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.620332] qcserial 1-1:1.3: Qualcomm USB modem converter detected
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.626906] usb 1-1: Qualcomm USB modem converter now attached to ttyUSB1
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.651145] cdc_mbim 1-1:1.12: cdc-wdm0: USB WDM device
Tue Apr  2 19:37:26 2019 kern.info kernel: [173019.657089] cdc_mbim 1-1:1.12 wwan0: register 'cdc_mbim' at usb-f1050000.usb-1, CDC MBIM, 7e:d8:5a:6e:14:8e
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 1
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 2 qcserial
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 3 qcserial
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 4 cdc_mbim
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 5 cdc_mbim
Tue Apr  2 19:37:26 2019 user.notice Log Print : Driver Name : 6 cdc_mbim
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: Add : 1-1: Manufacturer=Sierra_Wireless,_Incorporated Product=Sierra_Wireless_MC7455_Qualcomm®_Snapdragon™_X7_LTE-A Serial=LQ70954005041020 1199 9071
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: * Start of Modem Detection and Connection Information
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: * Product=Sierra_Wireless_MC7455_Qualcomm®_Snapdragon™_X7_LTE-A 1199 9071
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: * Found MBIM Modem at 1-1
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:26 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: * Switched to : 1199:9071
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 1
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 2 qcserial
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 3 qcserial
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 4 cdc_mbim
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 5 cdc_mbim
Tue Apr  2 19:37:36 2019 user.notice Log Print : Driver Name : 6 cdc_mbim
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: * ProtoFind returns : 3
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: *****************************************************************
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: Found Modem1
Tue Apr  2 19:37:36 2019 user.notice usb-modeswitch: Connecting a MBIM Modem
Tue Apr  2 19:37:36 2019 user.notice Create Connection: Start MBIM Connection
Tue Apr  2 19:37:41 2019 user.notice Create Connection: MBIM Comm Port : /dev/ttyUSB1
Tue Apr  2 19:37:48 2019 user.notice Get Profile: Default Profile Used
Tue Apr  2 19:37:49 2019 user.notice Create Connection: Pincode in script
Tue Apr  2 19:37:49 2019 user.notice Create Connection: Attempting to Connect
Tue Apr  2 19:37:51 2019 user.notice Create Connection: Using Netifd Method
Tue Apr  2 19:37:51 2019 daemon.notice netifd: Interface 'wan1' is setting up now
Tue Apr  2 19:37:51 2019 user.notice MBIM Connect: Query radio state
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Reading capabilities
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Check PIN state
Tue Apr  2 19:37:54 2019 daemon.notice netifd: wan1 (21926): required pin: 3 - pin2
Tue Apr  2 19:37:54 2019 daemon.notice netifd: wan1 (21926): remaining attempts: 3
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: PIN unlocked
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Checking subscriber
Tue Apr  2 19:37:54 2019 user.notice Get Profile: Default Profile Used
Tue Apr  2 19:37:54 2019 daemon.notice netifd: wan1 (21926): uci: Entry not found
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Register with network
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Attach to network
Tue Apr  2 19:37:54 2019 user.notice MBIM Connect: Connect to network
Tue Apr  2 19:37:55 2019 user.notice MBIM Connect: Get IP config
Tue Apr  2 19:37:56 2019 user.notice MBIM Connect: Connected, setting IP
Tue Apr  2 19:37:56 2019 kern.info kernel: [173049.200894] 8021q: adding VLAN 0 to HW filter on device wwan0
Tue Apr  2 19:37:56 2019 daemon.notice netifd: Interface 'wan1' is now up
Tue Apr  2 19:37:56 2019 daemon.notice netifd: Network device 'wwan0' link is up
Tue Apr  2 19:37:56 2019 user.notice URL-DEBUG: hotplug (iface): action='ifup' interface='wan1'
Tue Apr  2 19:37:56 2019 user.notice Connection Monitor: Start Connection Monitor for Modem 1
Tue Apr  2 19:37:56 2019 user.notice sms process: SMS Supported



Modem debug info

Code: Select all

Tue Apr  2 19:57:44 2019 : /dev/ttyUSB1 AT+CPMS="SM"
+CPMS: 0,0,0,0,0,0
OK
  
Tue Apr  2 19:57:53 2019 : /dev/ttyUSB1 AT+CSQ;+CESQ
+CSQ: 20,99
+CESQ: 99,99,255,255,25,39
OK
AT*CNTI=0
*CNTI: 0,LTE
OK
AT!SELRAT?
!SELRAT: 00, Automatic
OK
AT+ECIO?
+ECIO: NOT IMPLEMENTED
OK
AT+RSCP?
+RSCP: 
OK
AT!UMTSCHAN?
!UMTSCHAN: NOT IMPLEMENTED
OK
AT!GSTATUS?
!GSTATUS: 
Current Time:  1220		Temperature: 33
Reset Counter: 8391084		Mode:        ONLINE         
System mode:   LTE        	PS state:    Attached     
LTE band:      B41    		LTE bw:      20 MHz  
LTE Rx chan:   40978		LTE Tx chan: 40978
LTE CA state:  ACTIVE      		LTE Scell band:B41    
LTE Scell bw:20 MHz  		LTE Scell chan:41176
EMM state:     Registered     	Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv  		
PCC RxM RSSI:  -69		RSRP (dBm):  -99
PCC RxD RSSI:  -72		RSRP (dBm):  -101
SCC RxM RSSI:  -74		RSRP (dBm):  -103
SCC RxD RSSI:  -74		RSRP (dBm):  -103
Tx Power:      --		TAC:         0201 (513)
RSRQ (dB):     -8.7		Cell ID:     004A0577 (4850963)
SINR (dB):     17.4
OK
AT!PCTEMP?
Temp state: Normal
Temperature: 34.00 C
OK
Modem connection log

Code: Select all

Tue Apr  2 18:51:58 2019 : Disconnect (Removed) Modem #1
Tue Apr  2 18:52:28 2019 : Attempting to Connect Modem #1 (Sierra_Wireless,_Incorporated Sierra_Wireless_MC7455_Qualcomm®_Snapdragon™_X7_LTE-A)
Tue Apr  2 18:52:35 2019 : Modem #1 Connected ( Sierra Wireless, Incorporated MC7455)
Tue Apr  2 19:14:37 2019 : Disconnect (Removed) Modem #1
Tue Apr  2 19:15:06 2019 : Attempting to Connect Modem #1 (Sierra_Wireless,_Incorporated Sierra_Wireless_MC7455_Qualcomm®_Snapdragon™_X7_LTE-A)
Tue Apr  2 19:15:13 2019 : Modem #1 Connected ( Sierra Wireless, Incorporated MC7455)
Tue Apr  2 19:37:19 2019 : Disconnect (Removed) Modem #1
Tue Apr  2 19:37:49 2019 : Attempting to Connect Modem #1 (Sierra_Wireless,_Incorporated Sierra_Wireless_MC7455_Qualcomm®_Snapdragon™_X7_LTE-A)
Tue Apr  2 19:37:56 2019 : Modem #1 Connected ( Sierra Wireless, Incorporated MC7455)
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swwifty
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Re: MC7455 frequent disconnections mystery

Post by swwifty »

This is gonna be a tough one, cause it looks like you've done your homework.

Are you using external antennas or some small omnis?

I'd recommend moving the device around to see if that helps, otherwise I'm not really sure. It seems Sprint has these issues alot unfortunately, but it could be related to firmware versions.
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JimHelms
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Re: MC7455 frequent disconnections mystery

Post by JimHelms »

You may try resetting the MC7455 to OEM, and then upgrading to the latest Sierra Wireless Generic firmware.

There are release notes about correcting Sprint related issues.

You can also use the Sierra Wireless AirVantage to perform the update without removing the modem.

There are several AT-Commands that must be entered into the modem to allow AirVantage to communicate with it.
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FraCanTob
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Re: MC7455 frequent disconnections mystery

Post by FraCanTob »

Thanks for the thought.

I believe I updated the modem firmware a couple months ago, but it's possible there's something newer I guess.
Edit: I checked, I think I'm on SWI9X30C_02.30.03.00 002.046_001 which is the latest.

Yes, I'm using the small omnis that came with the USB enclosure for the modem.

Is there a best way to orient the little omnis? 90* to each other?
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swwifty
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Re: MC7455 frequent disconnections mystery

Post by swwifty »

FraCanTob wrote: ↑Wed Apr 03, 2019 1:01 pm Thanks for the thought.

I believe I updated the modem firmware a couple months ago, but it's possible there's something newer I guess.
Edit: I checked, I think I'm on SWI9X30C_02.30.03.00 002.046_001 which is the latest.

Yes, I'm using the small omnis that came with the USB enclosure for the modem.

Is there a best way to orient the little omnis? 90* to each other?
I usually orient each omni at a 45 degree angle away from each other.
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Re: MC7455 frequent disconnections mystery

Post by FraCanTob »

45* away from vertical each, so 90* angle between the two antennae?
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