Wiki source code of LA66 USB LoRaWAN Adapter User Manual

Version 160.1 by Bei Jinggeng on 2023/06/09 17:10

version	line-number	content
134.2	1
87.2	2
87.13	3	Table of Contents:
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1.1	5	{{toc/}}
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	7
6.1	8
87.2	9
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146.5	11	= 1. LA66 USB LoRaWAN Adapter =
87.2	12
146.5	13	== 1.1 Overview ==
88.2	14
100.2	15
93.1	16	[[image:image-20220715001142-3.png\|\|height="145" width="220"]]
	17
100.3	18
100.5	19	(((
91.1	20	(% style="color:blue" %)LA66 USB LoRaWAN Adapter(%%) is designed to fast turn USB devices to support LoRaWAN wireless features. It combines a CP2101 USB TTL Chip and LA66 LoRaWAN module which can easy to add LoRaWAN wireless feature to PC / Mobile phone or an embedded device that has USB Interface.
100.5	21	)))
52.1	22
100.5	23	(((
101.4	24	(% style="color:blue" %)LA66(%%) is a ready-to-use module that includes the (% style="color:blue" %)LoRaWAN v1.0.3 protocol(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
100.5	25	)))
73.1	26
100.5	27	(((
90.1	28	Each LA66 module includes a (% style="color:blue" %)world-unique OTAA key(%%) for LoRaWAN registration.
100.5	29	)))
90.1	30
100.5	31	(((
90.1	32	Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)open-source peer-to-peer LoRa Protocol(%%) for the none-LoRaWAN application.
100.5	33	)))
90.1	34
100.5	35	(((
90.1	36	LA66 is equipped with (% style="color:blue" %)TCXO crystal(%%) which ensures the module can achieve stable performance in extreme temperatures.
100.5	37	)))
90.1	38
	39
146.5	40	== 1.2 Features ==
73.1	41
137.6	42
73.1	43	* LoRaWAN USB adapter base on LA66 LoRaWAN module
	44	* Ultra-long RF range
	45	* Support LoRaWAN v1.0.4 protocol
	46	* Support peer-to-peer protocol
	47	* TCXO crystal to ensure RF performance on low temperature
	48	* Spring RF antenna
	49	* Available in different frequency LoRaWAN frequency bands.
	50	* World-wide unique OTAA keys.
	51	* AT Command via UART-TTL interface
	52	* Firmware upgradable via UART interface
93.3	53	* Open Source Mobile App for LoRaWAN signal detect and GPS tracking.
73.1	54
157.2	55
146.5	56	== 1.3 Specification ==
	57
	58
73.1	59	* CPU: 32-bit 48 MHz
	60	* Flash: 256KB
	61	* RAM: 64KB
	62	* Input Power Range: 5v
	63	* Frequency Range: 150 MHz ~~ 960 MHz
	64	* Maximum Power +22 dBm constant RF output
	65	* High sensitivity: -148 dBm
	66	* Temperature:
	67	** Storage: -55 ~~ +125℃
	68	** Operating: -40 ~~ +85℃
	69	* Humidity:
	70	** Storage: 5 ~~ 95% (Non-Condensing)
	71	** Operating: 10 ~~ 95% (Non-Condensing)
	72	* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
	73	* LoRa Rx current: <9 mA
	74
157.2	75
146.5	76	== 1.4 Pin Mapping & LED ==
	77
149.7	78
143.1	79	[[image:image-20220813183239-3.png\|\|height="526" width="662"]]
7.1	80
87.3	81
146.5	82	== 1.5 Example: Send & Get Messages via LoRaWAN in PC ==
87.3	83
146.5	84
100.5	85	(((
78.2	86	Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
100.5	87	)))
58.1	88
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157.2	90	(% style="color:blue" %)1. Connect the LA66 USB LoRaWAN adapter to PC
87.3	91
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106.1	93	[[image:image-20220723100027-1.png]]
78.2	94
87.3	95
58.1	96	Open the serial port tool
	97
	98	[[image:image-20220602161617-8.png]]
	99
157.2	100
78.2	101	[[image:image-20220602161718-9.png\|\|height="457" width="800"]]
58.1	102
	103
	104
157.2	105	(% style="color:blue" %)2. Press the reset switch RST on the LA66 USB LoRaWAN Adapter to reset it.
87.3	106
149.7	107
78.2	108	The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully Join the LoRaWAN network
58.1	109
87.3	110
78.2	111	[[image:image-20220602161935-10.png\|\|height="498" width="800"]]
58.1	112
78.2	113
	114
157.2	115	(% style="color:blue" %)3. See Uplink Command
78.2	116
149.7	117
87.3	118	Command format: (% style="color:#4472c4" %) AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>
	119
58.1	120	example: AT+SENDB=01,02,8,05820802581ea0a5
	121
78.2	122	[[image:image-20220602162157-11.png\|\|height="497" width="800"]]
58.1	123
	124
	125
157.2	126	(% style="color:blue" %)4. Check to see if TTN received the message
87.3	127
78.2	128
149.2	129	[[image:image-20220817093644-1.png]]
78.2	130
149.2	131
154.1	132	== 1.6 Example: How to join helium ==
	133
	134
157.2	135
	136	(% style="color:blue" %)1. Create a new device.
	137
	138
154.1	139	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220907165500-1.png?width=940&height=464&rev=1.1\|\|alt="image-20220907165500-1.png"]]
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	141
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157.2	143	(% style="color:blue" %)2. Save the device after filling in the necessary information.
	144
	145
154.1	146	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220907165837-2.png?width=809&height=375&rev=1.1\|\|alt="image-20220907165837-2.png" height="375" width="809"]]
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157.2	149
154.1	150	(% style="color:blue" %)3. Use AT commands.
	151
157.2	152
154.1	153	[[image:image-20220909151441-1.jpeg\|\|height="695" width="521"]]
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	155
	156
157.2	157	(% style="color:blue" %)4. Use the serial port tool
	158
	159
154.1	160	[[image:image-20220909151517-2.png\|\|height="543" width="708"]]
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157.2	164	(% style="color:blue" %)5. Use command AT+CFG to get device configuration
	165
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154.1	167	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220907170308-3.png?width=617&height=556&rev=1.1\|\|alt="image-20220907170308-3.png" height="556" width="617"]]
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157.2	170
154.1	171	(% style="color:blue" %)6. Network successfully.
	172
157.2	173
154.1	174	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220907170436-4.png?rev=1.1\|\|alt="image-20220907170436-4.png"]]
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157.2	177
154.1	178	(% style="color:blue" %)7. Send uplink using command
	179
	180
157.2	181	[[image:image-20220912085244-1.png]]
	182
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	184	[[image:image-20220912085307-2.png]]
	185
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	187
154.1	188	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220907170744-6.png?width=798&height=242&rev=1.1\|\|alt="image-20220907170744-6.png" height="242" width="798"]]
	189
	190
155.1	191	== 1.7 Example: Send PC's CPU/RAM usage to TTN via python ==
81.1	192
87.3	193
87.1	194	Use python as an example：[[https:~~/~~/github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py>>https://github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py]]
81.1	195
106.1	196	(Raspberry Pi example: [[https:~~/~~/github.com/dragino/LA66/blob/main/Send_information_to_TTN_Raspberry%20Pi.py>>https://github.com/dragino/LA66/blob/main/Send_information_to_TTN_Raspberry%20Pi.py]])
81.1	197
149.6	198
87.3	199	(% style="color:red" %)Preconditions:
81.1	200
87.3	201	(% style="color:red" %)1. LA66 USB LoRaWAN Adapter works fine
81.1	202
87.3	203	(% style="color:red" %)2. LA66 USB LoRaWAN Adapter is registered with TTN
81.1	204
	205
	206
87.3	207	(% style="color:blue" %)Steps for usage:
	208
	209	(% style="color:blue" %)1.(%%) Press the reset switch RESET on the LA66 USB LoRaWAN Adapter
	210
158.1	211	(% style="color:blue" %)2.(%%) Add [[decoder>>https://github.com/dragino/dragino-end-node-decoder/tree/main/LA66%20USB]] on TTN
87.3	212
158.1	213	(% style="color:blue" %)3.(%%) Run the python script in PC and see the TTN
149.6	214
158.1	215
81.1	216	[[image:image-20220602115852-3.png\|\|height="450" width="1187"]]
	217
	218
155.1	219	== 1.8 Example: Send & Get Messages via LoRaWAN in RPi ==
11.1	220
87.4	221
79.1	222	Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
12.1	223
79.1	224
157.2	225	(% style="color:blue" %)1. Connect the LA66 USB LoRaWAN Adapter to the Raspberry Pi
87.4	226
149.6	227
106.1	228	[[image:image-20220723100439-2.png]]
43.1	229
52.1	230
	231
157.2	232	(% style="color:blue" %)2. Install Minicom in RPi.
87.4	233
149.6	234
79.1	235	(% id="cke_bm_509388S" style="display:none" %) (%%)Enter the following command in the RPi terminal
52.1	236
87.4	237	(% style="background-color:yellow" %)apt update
52.1	238
87.4	239	(% style="background-color:yellow" %)apt install minicom
52.1	240
	241
79.1	242	Use minicom to connect to the RPI's terminal
52.1	243
79.1	244	[[image:image-20220602153146-3.png\|\|height="439" width="500"]]
52.1	245
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87.4	247
157.2	248	(% style="color:blue" %)3. Press the reset switch RST on the LA66 USB LoRaWAN Adapter.
8.1	249
149.6	250
87.11	251	The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully entered the network.
	252
	253
79.1	254	[[image:image-20220602154928-5.png\|\|height="436" width="500"]]
46.1	255
	256
	257
157.2	258	(% style="color:blue" %)4. Send Uplink message
46.1	259
149.6	260
87.5	261	Format: (% style="color:#4472c4" %)AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>
87.4	262
79.1	263	example: AT+SENDB=01,02,8,05820802581ea0a5
46.1	264
87.4	265
79.1	266	[[image:image-20220602160339-6.png\|\|height="517" width="600"]]
	267
87.4	268
	269
79.1	270	Check to see if TTN received the message
	271
157.2	272
79.1	273	[[image:image-20220602160627-7.png\|\|height="369" width="800"]]
	274
	275
155.1	276	== 1.9 Example: Use of LA66 USB LoRaWAN Adapter and mobile APP ==
11.1	277
155.1	278	=== 1.9.1 Hardware and Software Connection ===
13.1	279
134.2	280
146.5	281
134.2	282	==== (% style="color:blue" %)Overview：(%%) ====
	283
	284
134.9	285	(((
139.2	286	DRAGINO-LA66-APP is an Open Source mobile APP for LA66 USB LoRaWAN Adapter. DRAGINO-LA66-APP has below features:
106.1	287
139.2	288	* Send real-time location information of mobile phone to LoRaWAN network.
	289	* Check LoRaWAN network signal strengh.
	290	* Manually send messages to LoRaWAN network.
134.9	291	)))
111.1	292
106.1	293
134.2	294
146.5	295
139.2	296	==== (% style="color:blue" %)Hardware Connection:(%%) ====
134.2	297
149.6	298
139.2	299	A USB to Type-C adapter is needed to connect to a Mobile phone.
134.2	300
139.2	301	Note: The package of LA66 USB adapter already includes this USB Type-C adapter.
106.1	302
139.2	303	[[image:image-20220813174353-2.png\|\|height="360" width="313"]]
106.1	304
	305
146.5	306
139.2	307	==== (% style="color:blue" %)Download and Install App:(%%) ====
134.2	308
149.6	309
139.2	310	[[(% id="cke_bm_895007S" style="display:none" %) (%%)Download Link for Android apk >>https://www.dropbox.com/sh/zxwx16qb777uvkz/AABE_P8coGCQ4DAC8enH4bUya?dl=0]]. (Android Version Only)
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157.2	312
139.2	313	[[image:image-20220813173738-1.png]]
	314
	315
146.5	316
134.2	317	==== (% style="color:blue" %)Use of APP:(%%) ====
	318
149.6	319
110.1	320	Function and page introduction
	321
149.6	322
139.2	323	[[image:image-20220723113448-7.png\|\|height="995" width="450"]]
110.1	324
157.2	325
139.2	326	Block Explain:
134.9	327
139.2	328	1. Display LA66 USB LoRaWAN Module connection status
110.1	329
139.2	330	2. Check and reconnect
110.1	331
139.2	332	3. Turn send timestamps on or off
110.1	333
139.2	334	4. Display LoRaWan connection status
110.1	335
139.2	336	5. Check LoRaWan connection status
110.1	337
139.2	338	6. The RSSI value of the node when the ACK is received
110.1	339
139.2	340	7. Node's Signal Strength Icon
110.1	341
139.2	342	8. Configure Location Uplink Interval
110.1	343
139.2	344	9. AT command input box
110.1	345
139.2	346	10. Send Button: Send input box info to LA66 USB Adapter
110.1	347
139.2	348	11. Output Log from LA66 USB adapter
110.1	349
139.2	350	12. clear log button
110.1	351
139.2	352	13. exit button
110.1	353
134.2	354
149.6	355
106.1	356	LA66 USB LoRaWAN Module not connected
	357
149.6	358
139.2	359	[[image:image-20220723110520-5.png\|\|height="677" width="508"]]
106.1	360
134.2	361
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110.1	363	Connect LA66 USB LoRaWAN Module
106.1	364
157.2	365
139.2	366	[[image:image-20220723110626-6.png\|\|height="681" width="511"]]
110.1	367
134.2	368
155.1	369	=== 1.9.2 Send data to TTNv3 and plot location info in Node-Red ===
111.1	370
	371
134.8	372	(% style="color:blue" %)1. Register LA66 USB LoRaWAN Module to TTNV3
134.2	373
149.6	374
113.1	375	[[image:image-20220723134549-8.png]]
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	377
134.2	378
134.8	379	(% style="color:blue" %)2. Open Node-RED,And import the JSON file to generate the flow
134.2	380
149.6	381
139.2	382	Sample JSON file please go to [[this link>>https://www.dropbox.com/sh/zxwx16qb777uvkz/AABE_P8coGCQ4DAC8enH4bUya?dl=0]] to download.
117.1	383
139.2	384	For the usage of Node-RED, please refer to: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Node-RED/>>http://wiki.dragino.com/xwiki/bin/view/Main/Node-RED/]]
113.1	385
139.2	386	After see LoRaWAN Online, walk around and the APP will keep sending location info to LoRaWAN server and then to the Node Red.
117.1	387
151.1	388	LA66~-~-node-red~-~-decoder:[[dragino-end-node-decoder/Node-RED at main · dragino/dragino-end-node-decoder · GitHub>>url:https://github.com/dragino/dragino-end-node-decoder/tree/main/Node-RED]]
139.2	389
151.1	390
139.2	391	Example output in NodeRed is as below:
	392
117.1	393	[[image:image-20220723144339-1.png]]
	394
134.2	395
155.1	396	== 1.10 Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
73.1	397
134.2	398
157.2	399	The LA66 USB LoRaWAN Adapter is the same as the LA66 LoRaWAN Shield update method.
73.1	400
157.2	401	Just use the yellow jumper cap to short the BOOT corner and the RX corner, and then press the RESET button (without the jumper cap, you can directly short the BOOT corner and the RX corner with a wire to achieve the same effect).
73.1	402
159.2	403	(% style="color:red" %)Notice: If upgrade via USB hub is not sucessful. try to connect to PC directly.
149.4	404
119.1	405	[[image:image-20220723150132-2.png]]
73.1	406
160.1	407	==== Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
119.1	408
160.1	409	1. Software download link: [[https:~~/~~/www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0>>url:https://www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0]]
	410
	411	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602103227-6.png?rev=1.1\|\|alt="image-20220602103227-6.png"]]
	412
	413	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602103357-7.png?rev=1.1\|\|alt="image-20220602103357-7.png"]]
	414
	415	2. Select the COM port corresponding to USB TTL
	416
	417	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602103844-8.png?rev=1.1\|\|alt="image-20220602103844-8.png"]]
	418
	419	3. Select the bin file to burn
	420
	421	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602104144-9.png?rev=1.1\|\|alt="image-20220602104144-9.png"]]
	422
	423	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602104251-10.png?rev=1.1\|\|alt="image-20220602104251-10.png"]]
	424
	425	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602104402-11.png?rev=1.1\|\|alt="image-20220602104402-11.png"]]
	426
	427	4. Click to start the download
	428
	429	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602104923-13.png?rev=1.1\|\|alt="image-20220602104923-13.png"]]
	430
	431	5. Check update process
	432
	433	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602104948-14.png?rev=1.1\|\|alt="image-20220602104948-14.png"]]
	434
	435	The following picture shows that the burning is successful
	436
	437	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20LoRaWAN%20Shield%20User%20Manual/WebHome/image-20220602105251-15.png?rev=1.1\|\|alt="image-20220602105251-15.png"]]
	438
146.5	439	= 2. FAQ =
73.1	440
157.4	441	== 2.1 How to Compile Source Code for LA66? ==
137.2	442
	443
146.4	444	Compile and Upload Code to ASR6601 Platform ：[[Instruction>>Main.User Manual for LoRaWAN End Nodes.LA66 LoRaWAN Module.Compile and Upload Code to ASR6601 Platform.WebHome]]
137.2	445
	446
157.3	447	== 2.2 Where to find Peer-to-Peer firmware of LA66? ==
	448
	449
	450	Instruction for LA66 Peer to Peer firmware :[[ Instruction >>doc:Main.User Manual for LoRaWAN End Nodes.LA66 LoRaWAN Shield User Manual.Instruction for LA66 Peer to Peer firmware.WebHome]]
	451
	452
146.5	453	= 3. Order Info =
137.2	454
	455
146.5	456	Part Number: (% style="color:blue" %)LA66-USB-LoRaWAN-Adapter-XXX
87.4	457
	458
87.5	459	(% style="color:blue" %)XXX(%%): The default frequency band
86.1	460
87.5	461	* (% style="color:red" %)AS923(%%): LoRaWAN AS923 band
	462	* (% style="color:red" %)AU915(%%): LoRaWAN AU915 band
	463	* (% style="color:red" %)EU433(%%): LoRaWAN EU433 band
	464	* (% style="color:red" %)EU868(%%): LoRaWAN EU868 band
	465	* (% style="color:red" %)KR920(%%): LoRaWAN KR920 band
	466	* (% style="color:red" %)US915(%%): LoRaWAN US915 band
	467	* (% style="color:red" %)IN865(%%): LoRaWAN IN865 band
	468	* (% style="color:red" %)CN470(%%): LoRaWAN CN470 band
	469	* (% style="color:red" %)PP(%%): Peer to Peer LoRa Protocol
73.1	470
157.2	471
146.5	472	= 4. Reference =
	473
	474
	475	* Hardware Design File for LA66 USB LoRaWAN Adapter : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
150.1	476	* Mobile Phone App Source Code: [[Download>>https://github.com/dragino/LA66_Mobile_App]].
149.6	477
157.5	478
	479	= 5. FCC Statement =
	480
	481
	482	(% style="color:red" %)FCC Caution:
	483
	484	Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
	485
	486	This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
	487
	488
	489	(% style="color:red" %)IMPORTANT NOTE:
	490
	491	(% style="color:red" %)Note:(%%) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
	492
	493	—Reorient or relocate the receiving antenna.
	494
	495	—Increase the separation between the equipment and receiver.
	496
	497	—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
	498
	499	—Consult the dealer or an experienced radio/TV technician for help.
	500
	501
	502	(% style="color:red" %)FCC Radiation Exposure Statement:
	503
	504	This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.This equipment should be installed and operated with minimum distance 20cm between the radiator& your body.
158.2	505
	506

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