Changes for page HP0D -- Full Hotspot for Helium User Manual
Last modified by Xiaoling on 2024/10/21 15:44
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... ... @@ -146,55 +146,63 @@ 146 146 147 147 [[image:1651803959860-394.png||height="500" width="375"]] 148 148 149 + 150 + 149 149 ((( 150 150 ((( 151 -**Label information:** 153 +**~ Label information:** 152 152 ))) 153 153 ))) 154 154 155 155 ((( 156 156 ((( 157 - **Devicehost name:** (% class="mark" %)dragino-xxxxxx159 + 158 158 ))) 159 159 ))) 160 160 161 161 ((( 162 162 ((( 163 -** Band**:US915/AU915/AS923_1-AS923_4/KR920/EU868/IN865/RU864165 +**~ Device host name:** (% class="mark" %)dragino-xxxxxx 164 164 ))) 165 165 ))) 166 166 167 167 ((( 168 168 ((( 169 -** Mineranimalname**:xxx-xxx-xxx171 +**~ Band**: US915/AU915/AS923_1-AS923_4/KR920/EU868/IN865/RU864 170 170 ))) 171 171 ))) 172 172 173 173 ((( 174 174 ((( 175 -**Miner a ddress**:112xxxxxx177 +**~ Miner animal name**: xxx-xxx-xxx 176 176 ))) 177 177 ))) 178 178 179 179 ((( 180 180 ((( 181 -** EthMACaddress**:A8: 40: 41: EF: FE: CD183 +**~ Miner address**: 112xxxxxx 182 182 ))) 183 183 ))) 184 184 185 185 ((( 186 186 ((( 187 -** Login**:root/d59f2d5b((%class="mark"%)therootistheLoginaccountfortheWeb-UIand SSH.(%%))189 +**~ Eth MAC address**: A8: 40: 41: EF: FE: CD 188 188 ))) 189 189 ))) 190 190 191 191 ((( 192 192 ((( 193 -** SN**:deviceserialnumber.195 +**~ Login**: root/d59f2d5b ((% class="mark" %)the root is the Login account for the Web-UI and SSH.(%%)) 194 194 ))) 195 195 ))) 196 196 199 +((( 200 +((( 201 +**~ SN**: device serial number. 202 +))) 203 +))) 197 197 205 + 198 198 ==== 2. Quick Start & Onboarding ==== 199 199 200 200 ((( ... ... @@ -214,7 +214,7 @@ 214 214 215 215 ((( 216 216 ((( 217 -At the first boot of HP0D, it will auto generate a Wi-Fi network 225 + At the first boot of HP0D, it will auto generate a Wi-Fi network 218 218 219 219 [[image:1651804327535-321.png||height="325" width="199"]] 220 220 ))) ... ... @@ -230,7 +230,7 @@ 230 230 ((( 231 231 (% class="box infomessage" %) 232 232 ((( 233 - called : **//HPD-dragino-xxxxxx//** 241 + called : **//HPD-dragino-xxxxxx//** 234 234 ))) 235 235 ))) 236 236 ))) ... ... @@ -239,7 +239,7 @@ 239 239 ((( 240 240 (% class="box infomessage" %) 241 241 ((( 242 - with password: **//dragino+dragino//** 250 + with password: **//dragino+dragino//** 243 243 ))) 244 244 ))) 245 245 ))) ... ... @@ -246,21 +246,45 @@ 246 246 247 247 ((( 248 248 ((( 249 - Youcan use a PC to connect to this Wi-Fi network. The PC will get an IP address 10.130.1.xxx and the HP0D has the default IP 10.130.1.1257 + 250 250 ))) 251 251 ))) 252 252 261 +((( 262 +((( 263 + 264 +))) 265 +))) 266 + 267 +((( 268 +((( 269 + You can use a PC to connect to this Wi-Fi network. The PC will get an IP address 10.130.1.xxx and the HP0D has the default IP 10.130.1.1 270 +))) 271 +))) 272 + 253 253 [[image:1651804397792-591.png||height="402" width="763"]] 254 254 255 255 276 + 256 256 ====== 2.1.2 Connect via HP0D hostname ====== 257 257 258 258 ((( 259 -Connect the HP0D Ethernet port to your router and HP0D will obtain an IP address. If your PC(Windows/Mac/Ubuntu) connect the same network with the HP0D, you can access the HP0D Web-UI via HP0D’s hostname. 280 + Connect the HP0D Ethernet port to your router and HP0D will obtain an IP address. If your 281 +))) 260 260 261 -Like: __**//http:~/~/dragino-4ba54a//**__ 283 +((( 284 + PC(Windows/Mac/Ubuntu) connect the same network with the HP0D, you can access the HP0D 262 262 ))) 263 263 287 +((( 288 + Web-UI via HP0D’s hostname. 289 +))) 290 + 291 + 292 + Like: __**//http:~/~/dragino-4ba54a//**__ 293 + 294 + 295 +(% style="text-align:center" %) 264 264 [[image:1651804629009-699.png]] 265 265 266 266 ... ... @@ -268,27 +268,40 @@ 268 268 269 269 ((( 270 270 ((( 271 -Connect the HP0D Ethernet port to your router and HP0D will obtain an IP address from your router. In the router’s management portal, you should be able to find what IP address the router has assigned to the HP0D.303 + Connect the HP0D Ethernet port to your router and HP0D will obtain an IP address from your router. In the 272 272 ))) 273 273 ))) 274 274 275 275 ((( 276 -If you get the IP address form route, like~:// (% class="mark" %)**10.130.2.42**(%%),// you can use this IP address to connect the WEB UI or SSH access of HP0D. 308 +((( 309 + router’s management portal, you should be able to find what IP address the router has assigned to the HP0D. 277 277 ))) 311 +))) 278 278 313 +((( 314 + 315 +))) 316 + 317 + If you get the IP address form route, like~:// (% class="mark" %)**10.130.2.42**(%%),// you can use this IP address to connect the WEB UI 318 + 319 + or SSH access of HP0D. 320 + 321 +(% style="text-align:center" %) 279 279 [[image:1651804782523-623.png]] 280 280 281 281 325 + 282 282 ===== 2.2 Generate QR Code ===== 283 283 284 284 ((( 285 -Go to **Miner** ~-~-> **QR Generate**, input your Helium Wallet Address, and click Generate. 329 + Go to **Miner** ~-~-> **QR Generate**, input your Helium Wallet Address, and click Generate. 286 286 ))) 287 287 288 288 ((( 289 -Note: After onboarding, this wallet will become owner of this hotspot. 333 + Note: After onboarding, this wallet will become owner of this hotspot. 290 290 ))) 291 291 336 +(% style="text-align:center" %) 292 292 [[image:image-20220506140312-1.png||height="435" width="438"]] 293 293 294 294 ... ... @@ -295,48 +295,58 @@ 295 295 ===== 2.3 Onboarding Hotspot ===== 296 296 297 297 ((( 298 -~1. Download the Helium Hotspot APP from the Apple or Google Play store. 343 + ~1. Download the Helium Hotspot APP from the Apple or Google Play store. 299 299 ))) 300 300 301 301 ((( 302 -Note: the APP version need to be greater than 3.11. 347 + Note: the APP version need to be greater than 3.11. 348 +))) 303 303 350 +((( 304 304 305 305 ))) 306 306 307 307 ((( 308 -2. To add a hotspot, select “Hotspot”. On this tab, click the ‘+ Add Hotspot’ in the mid where choose the ‘DRAGINO Miner HP0D’355 + 2. To add a hotspot, select “Hotspot”. On this tab, click the ‘+ Add Hotspot’ in the mid where choose 309 309 ))) 310 310 311 - [[image:1651817186037-899.png||height="429" width="206"]] [[image:1651817194458-938.png||height="434" width="203"]] 358 +((( 359 + the ‘DRAGINO Miner HP0D’ 360 +))) 312 312 362 + [[image:1651817186037-899.png||height="429" width="206"]] [[image:1651817194458-938.png||height="434" width="203"]] 313 313 314 -3. Scan the QR Code you generated in the previous step. 364 + 3. Scan the QR Code you generated in the previous step. 315 315 366 +(% style="text-align:center" %) 316 316 [[image:1651828211026-220.png||height="405" width="191"]] 317 317 369 + 4. Onboarding your device 318 318 319 - 4.Onboardingyour device371 + Mobile APP will get info from onboarding server. If MAC address doesn’t appear, it means the network connection of 320 320 321 - MobileAPPwillget info fromnboarding server. If MAC address doesn’t appear, it means the network connection of mobile to onboarding server might have issue.[[image:image-20220506141159-2.png||height="422" width="202"]] [[image:1651817529289-461.png||height="423" width="199"]]373 + mobile to onboarding server might have issue. 322 322 323 - [[image: 1651828250802-391.png||height="421" width="197"]] [[image:1651828262668-768.png||height="416" width="196"]](% style="display:none" %)375 + [[image:image-20220506141159-2.png||height="426" width="204"]] [[image:1651817529289-461.png||height="423" width="199"]] 324 324 377 + [[image:1651828250802-391.png||height="437" width="205"]] [[image:1651828262668-768.png||height="433" width="204"]] 325 325 379 + 326 326 5. Check onboarding status 327 327 328 -You can check from mobile: 382 + You can check from mobile: 329 329 330 - [[image:1651828391664-884.png||height="413" width="197"]] [[image:1651828401011-970.png||height="412" width="193"]] (% style="display:none" %)384 + [[image:1651828391664-884.png||height="413" width="197"]] [[image:1651828401011-970.png||height="412" width="193"]] 331 331 332 -You can also see the hotspot status in below link: 386 + You can also see the hotspot status in below link: 333 333 334 -https:~/~/explorer.helium.com/hotspots/**//<(% class="mark" %)YOUR_HOTSPORT_KEY(%%)>//** 388 + https:~/~/explorer.helium.com/hotspots/**//<(% class="mark" %)YOUR_HOTSPORT_KEY(%%)>//** 335 335 336 -Example: 390 + Example: 337 337 338 -Green Synced means hotspot works normal. 392 + Green Synced means hotspot works normal. 339 339 394 +(% style="text-align:center" %) 340 340 [[image:1651828427715-679.png||height="374" width="635"]] 341 341 342 342 ... ... @@ -343,9 +343,18 @@ 343 343 ===== 2.4 Set the Port Forwarding ===== 344 344 345 345 ((( 346 -Helium Hotspots may not work if the Hotspot is behind a firewall or uses an incompatible NAT type. Other times it may be because of a router configuration or the internet is offline. This article aims to help resolve any issues you may have.401 + Helium Hotspots may not work if the Hotspot is behind a firewall or uses an incompatible NAT type. Other times 347 347 ))) 348 348 404 +((( 405 + it may be because of a router configuration or the internet is offline. This article aims to help resolve any issues 406 +))) 407 + 408 +((( 409 + you may have. 410 +))) 411 + 412 +(% style="text-align:center" %) 349 349 [[image:1651828514449-658.png]] 350 350 351 351 ((( ... ... @@ -353,15 +353,15 @@ 353 353 ))) 354 354 355 355 ((( 356 -Note: Please refer to more detailed Settings 420 + Note: Please refer to more detailed Settings 357 357 ))) 358 358 359 359 ((( 360 -[[https:~~/~~/docs.helium.com/troubleshooting/network-troubleshooting/>>url:https://docs.helium.com/troubleshooting/network-troubleshooting/]] 424 + [[https:~~/~~/docs.helium.com/troubleshooting/network-troubleshooting/>>url:https://docs.helium.com/troubleshooting/network-troubleshooting/]] 361 361 ))) 362 362 363 363 ((( 364 -[[https:~~/~~/www.youtube.com/watch?v=GKusVC7ovrE>>url:https://www.youtube.com/watch?v=GKusVC7ovrE]] 428 + [[https:~~/~~/www.youtube.com/watch?v=GKusVC7ovrE>>url:https://www.youtube.com/watch?v=GKusVC7ovrE]] 365 365 ))) 366 366 367 367 ... ... @@ -369,27 +369,35 @@ 369 369 370 370 ===== 3.1 LoRa frequency configuration ===== 371 371 436 +(% style="text-align:center" %) 372 372 [[image:1651828687205-178.png||height="323" width="657"]] 373 373 374 374 440 + 375 375 ===== 3.2 Check the LoRaWAN serveraddress ===== 376 376 443 + 444 +(% style="text-align:center" %) 377 377 [[image:1651828703680-156.png||height="349" width="672"]] 378 378 379 379 380 380 ===== 3.3 Check Miner configuration ===== 381 381 450 +(% style="text-align:center" %) 382 382 [[image:image-20220506181408-1.png||height="451" width="513"]] 383 383 384 -**Note: Check the Region and Height, the default height is greater than 1, if it is 1 please Click the mid button of Update, and then wait 10mins to check here,**453 +**~ Note: Check the Region and Height, the default height is greater than 1, if it is 1 please Click the mid** 385 385 455 +**~ button of Update, and then wait 10mins to check here,** 386 386 457 + 387 387 ==== 4. Installation of Antenna ==== 388 388 389 389 ((( 390 -HP0D use Fiber Glass Antenna. 461 + HP0D use Fiber Glass Antenna. 391 391 ))) 392 392 464 +(% style="text-align:center" %) 393 393 [[image:1651832158606-882.png]] 394 394 395 395 ((( ... ... @@ -397,10 +397,19 @@ 397 397 ))) 398 398 399 399 ((( 400 - Userneed to connect antenna cable’s SMA connector to the HP03 and connect N-Type connector to antenna and install as below:472 + 401 401 ))) 402 402 403 403 ((( 476 + User need to connect antenna cable’s SMA connector to the HP03 and connect N-Type connector 477 +))) 478 + 479 +((( 480 + to antenna and install as below: 481 +))) 482 + 483 +((( 484 +(% style="text-align:center" %) 404 404 [[image:1651832205608-998.png||height="349" width="198"]] 405 405 ))) 406 406 ... ... @@ -407,57 +407,65 @@ 407 407 ==== 5. SSH Access for Linux console ==== 408 408 409 409 ((( 410 -IP address: IP address of HP0D or hostname of HP0D (Such as dragino-63920a) 491 + IP address: IP address of HP0D or hostname of HP0D (Such as dragino-63920a) 411 411 ))) 412 412 413 413 ((( 414 -Port: 22 495 + Port: 22 415 415 ))) 416 416 417 417 ((( 418 -User Name: **root** 499 + User Name: **root** 419 419 ))) 420 420 421 421 ((( 422 -Password: **Randomly generated ((% class="mark" %)found on device’s label(%%) )** 503 + Password: **Randomly generated ((% class="mark" %)found on device’s label(%%) )** 423 423 ))) 424 424 425 425 ((( 426 - Afterlogging in, you will be in the Linux console and can enter commands as shown below.507 + 427 427 ))) 428 428 510 +((( 511 + After logging in, you will be in the Linux console and can enter commands as shown below. 512 +))) 513 + 514 +(% style="text-align:center" %) 429 429 [[image:1651832284160-991.png]] 430 430 431 431 432 432 ==== **6. How to change the Wireless function of HP0D** ==== 433 433 434 -The wireless function is configured as AP by default and the web page does not support configuration, if you want to configure it as client connection mode, you need to configure it manually in Linux CIL.520 + // The wireless function is configured as AP by default and the web page does not support configuration, // 435 435 522 +// if you want to configure it as client connection mode, you need to configure it manually in Linux CIL.// 523 + 436 436 ===== **6.1 Access the Linux console.** ===== 437 437 438 -Follow the previous step of Step 5. 526 + Follow the previous step of Step 5. 439 439 440 440 441 441 ===== 6.2 Install the package of network-manager. ===== 442 442 443 -Run commands: 531 + Run commands: 444 444 445 445 (% class="box infomessage" %) 446 446 ((( 447 - apt update 448 - apt install network-manager 535 + apt update 536 + apt install network-manager 449 449 ))) 450 450 451 451 [[image:image-20220507140730-1.png]] 452 452 453 453 542 + 454 454 ===== 6.3 Reboot the device. ===== 455 455 456 -Run command: 545 + Run command: 457 457 458 458 (% class="box infomessage" %) 459 459 ((( 460 - reboot 549 + reboot 461 461 ))) 462 462 463 463 [[image:image-20220507140814-2.png]] ... ... @@ -464,11 +464,11 @@ 464 464 465 465 ===== 6.4 Check the wireless type ===== 466 466 467 -Run command: 556 + Run command: 468 468 469 469 (% class="box infomessage" %) 470 470 ((( 471 - iw dev 560 + iw dev 472 472 ))) 473 473 474 474 [[image:image-20220507140941-3.png]] ... ... @@ -475,91 +475,112 @@ 475 475 476 476 ===== 6.5 Connect the WiFi. ===== 477 477 478 -Run command: 567 + Run command: 479 479 480 480 (% class="box infomessage" %) 481 481 ((( 482 - nmtui 571 + nmtui 483 483 ))) 484 484 485 485 [[image:image-20220507140953-4.png]] 486 486 487 487 577 + 488 488 ==== 7. Trouble Shootings ==== 489 489 490 490 ===== 7.1 How to get a wallet address? ===== 491 491 492 -Download the helium Hotspots APP on the Apple or Google Play store to generate own wallet. 582 +// // Download the helium Hotspots APP on the Apple or Google Play store to generate own wallet. 493 493 494 494 495 495 ===== 7.2 Onboarding ~-~- Unable to access Web-UI ~-~-> Miner ===== 496 496 497 497 ((( 498 -User can login the HP0D, able to access other Web Pages except miner page .588 + User can login the HP0D, able to access other Web Pages except miner page 499 499 ))) 500 500 501 501 ((( 502 -If you first boot the device where you need to wait for 10 mins for initialization connection to Helium server. 592 + If you first boot the device where you need to wait for 10 mins for initialization connection to Helium server. 503 503 ))) 504 504 505 505 506 506 ===== 7.3 Onboarding ~-~- Some parameters in miner page show timeout ===== 507 507 598 +(% style="text-align:center" %) 508 508 [[image:image-20220506182042-2.png||height="250" width="516"]] 509 509 601 +(% style="text-align:center" %) 510 510 [[image:1651832455372-647.png||height="224" width="520"]] 511 511 512 -HP0D is establish connection to Helium server and not finished. And you might see above. 513 513 514 - Itmightrelateto thenetworkwheremightupto10mins.605 + HP0D is establish connection to Helium server and not finished. And you might see above. 515 515 607 + It might relate to the network where might up to 10mins 516 516 609 + 517 517 ===== 7.4 Onboarding – Bad Gaterway ===== 518 518 612 +(% style="text-align:center" %) 519 519 [[image:1651832583790-633.png]] 520 520 521 -This is caused by the process leads too long which just need to refresh the page. 615 + This is caused by the process leads too long which just need to refresh the page. 522 522 523 523 524 524 7.5 Onboarding ~-~- Why did QR Code generate is aways fail? 525 525 620 +(% style="text-align:center" %) 526 526 [[image:image-20220506182424-3.png]] 527 527 528 -((( 529 -This may be related to the current block height, if the device is synchronizing to the latest height or if the device block height is much lower than the current height as the above picture like '1 1', the QR code generation may fail. 530 -))) 623 + This may be related to the current block height, if the device is synchronizing to the latest height or if the 531 531 625 + device block height is much lower than the current height as the above picture like '1 1', the QR code 532 532 627 + generation may fail. 628 + 629 + 533 533 ===== 7.6 Onboarding ~-~- Why is the QR Code not quite the same as the manual? ===== 534 534 632 +(% style="text-align:center" %) 535 535 [[image:1651832742262-209.png||height="297" width="365"]] 536 536 537 -Please ensure that you enter the correct wallet address and that your network is up and running, the user can click the button of ‘Clean’ to re-generate the QR Code.635 + Please ensure that you enter the correct wallet address and that your network is up and running, the user can 538 538 637 + click the button of ‘Clean’ to re-generate the QR Code. 539 539 639 + 540 540 ===== 7.7 Onboarding – MAC address is ‘Unknown’ after scan QR Code ===== 541 541 642 +(% style="text-align:center" %) 542 542 [[image:1651832811038-780.png||height="462" width="216"]] 543 543 544 -If you see the MAC Address shows the ‘Unknown’ where is due to the provision error, please contact us to help you solve.645 + If you see the MAC Address shows the ‘Unknown’ where is due to the provision error, 545 545 647 + please contact us to help you solve. 546 546 649 + 547 547 ===== 7.8 Onboarding – MAC address is being refreshed after scan QR Code ===== 548 548 549 -After scan QR Code, Mobile APP will connect Helium onboarding server and provide the public key/ wallet address to onboarding server. Server will return the match MAC address for this hotspot.652 +// // After scan QR Code, Mobile APP will connect Helium onboarding server and provide the 550 550 551 - Ifyoudon’tseeMACaddress,makesureyourmobile hasgoodinternet connection.654 + public key/ wallet address to onboarding server. Server will return the match MAC address 552 552 656 + for this hotspot. 657 + 658 + 659 + If you don’t see MAC address, make sure your mobile has good internet connection. 660 + 661 +(% style="text-align:center" %) 553 553 [[image:1651832880009-473.png]] 554 554 555 555 556 556 ===== 7.9 HP0D Web ~-~-> Miner ~-~-> Version shows ‘short’ ===== 557 557 558 -This is caused by the server connection delay, which does not affect the normal use. 667 + This is caused by the server connection delay, which does not affect the normal use. 559 559 669 + 670 +(% style="text-align:center" %) 560 560 [[image:1651832959907-357.png]] 561 561 562 - 563 563 ===== 7.10 Mobile APP crash after scan the QR Code? ===== 564 564 565 565 * Make sure you have input the correct Wallet address to generate QR Code. ... ... @@ -567,37 +567,44 @@ 567 567 * Make sure your mobile app’s relevant permission are enabled. 568 568 * Known: The Android 11 version may cause this kind of issue. 569 569 680 +1. 681 +11. Why the frequency/region is not the same what I purchased? 570 570 571 - =====7.11Whythefrequency/regionsnotthesame what Ipurchased? =====683 +//Each HP0D is inspected and configured prior to shipping.// 572 572 573 - EachHP0D isinspectedandconfiguredprior toshipping.685 +//If your HP0D Web-UI – Miner region is not the same with the shell labels, please contact our support team that will solve this issue for you.// 574 574 575 -If your HP0D Web-UI – Miner region is not the same with the shell labels, please contact our support team that will solve this issue for you. 576 576 688 +1. 689 +11. Can use the frequency to a region where is not support? 577 577 578 - =====7.12Can usethefrequencyto aregionwhereis notsupport?=====691 +//Please make sure that the region supports this frequency, you can confirm the appropriate frequency through this link// 579 579 580 -Please make sure that the region supports this frequency, you can confirm the appropriate frequency through this link 581 - 582 582 [[https:~~/~~/docs.helium.com/lorawan-on-helium/frequency-plans>>url:https://docs.helium.com/lorawan-on-helium/frequency-plans]] 583 583 584 584 585 -===== 7.13 Can change the frequency of the HP0D Miner? ===== 696 +1. 697 +11. Can change the frequency of the HP0D Miner? 586 586 587 -We do not recommend doing this, it may damage your device 699 +//We do not recommend doing this, it may damage your device// 588 588 589 589 590 -==== 8. Supports ==== 591 591 592 -If you are experiencing issues and can’t solve, you can send mail to 593 593 594 -[[support@dragino.com>>mailto:support@dragino.com]] 595 595 596 - Withyour question as detail aspossible. We will reply and help you in the shortest.705 +1. Supports 597 597 707 +//If you are experiencing issues and can’t solve, you can send mail to// 598 598 599 - ==== 9.OrderInfo====709 +[[//support@dragino.com//>>mailto:support@dragino.com]] 600 600 711 +//With your question as detail as possible. We will reply and help you in the shortest.// 712 + 713 + 714 + 715 + 716 +1. Order Info 717 + 601 601 **HP0D-XXX** 602 602 603 603 **XXX**: Frequency Band ... ... @@ -605,9 +605,8 @@ 605 605 * 868: For Bands: EU868,IN865 606 606 * 915: For Bands: US915,AU915,AS923,KR920 607 607 725 +1. Manufacturer Info 608 608 609 -==== 10. Manufacturer Info ==== 610 - 611 611 **Shenzhen Dragino Technology Development co. LTD** 612 612 613 613 Room 202, Block B, BCT Incubation Bases (BaoChengTai), No.8 CaiYunRoad ... ... @@ -615,7 +615,7 @@ 615 615 LongCheng Street, LongGang District ; Shenzhen 518116,China 616 616 617 617 618 - ====11. FCC Warning====734 +1. FCC Warning 619 619 620 620 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: 621 621