# Float/Fix postcard base error **URL:** \ **Category:** GPS/GNSS\ **Created:** [March 23, 2025, 8:18pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152 "2025-03-23T20:18:00Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 23, 2025, 8:18pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/1 "2025-03-23T20:18:01Z")
I am using 2 postcards, with lora radios, I have set low bandwith mode on the base and set defaults to logging and not turned on extra nmea messages over default. I find that most times my rover will either be in float or if it does get a fix it will age out to 120 seconds and drop out. How can I fix this? ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 23, 2025, 9:21pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/2 "2025-03-23T21:21:22Z")
So I’m wondering if my backyard maybe the signal is just not good enough. I have power lines and a tree and I’m remembering a time I tried to do static with a Trimble and couldn’t get a good static observation downtown. I’m using a survey tripod and multiband antenna. The longer it’s been cooking the longer I’ve seen fixes hold. ---
**Author:** ![rftop](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/rftop/32/6121_2.png) [@rftop](https://community.sparkfun.com/u/rftop)\ **Post date:** [March 23, 2025, 11:37pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/3 "2025-03-23T23:37:07Z")
I just read this on the Quectel forum: > The maximum allowed time for injecting base station data into LG290P module is every 5 seconds ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 23, 2025, 11:39pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/4 "2025-03-23T23:39:26Z")
okay needed to copy off sd card to another place. Got a rinex made. now will it process is the next question. ---
**Author:** ![rftop](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/rftop/32/6121_2.png) [@rftop](https://community.sparkfun.com/u/rftop)\ **Post date:** [March 23, 2025, 11:47pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/5 "2025-03-23T23:47:15Z")
The “maximum” statement isn’t extremely clear. The LG290P can operate with Corrections older than 5 seconds. It can also operate with 1 second corrections. I’m afraid it’s not all that useful of a comment 🫣 ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 23, 2025, 11:47pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/6 "2025-03-23T23:47:58Z")
I am wondering if my backyard just causes it to kick in and out of rtk solution. Might need to try a big open field next. ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 24, 2025, 12:17am UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/7 "2025-03-24T00:17:54Z")
Well I’ve now tried esp now and it works 1 second holding rtk, so the question is what Lora needs to function. ---
**Author:** ![dilshana](https://avatars.discourse-cdn.com/v4/letter/d/f4b2a3/32.png) [@dilshana](https://community.sparkfun.com/u/dilshana)\ **Post date:** [March 27, 2025, 2:23pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/8 "2025-03-27T14:23:48Z")
How is your testing area? Does the rover antenna have a clear, unobstructed view of the sky? ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [March 27, 2025, 3:17pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/9 "2025-03-27T15:17:56Z")
My testing area is my backyard based on reading and using espnow I have determined it’s the Lora link crashing from being flooded. I have not tried using a fixed channel as was suggested to me so I will try that next. ---
**Author:** ![dou2468](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/dou2468/32/8841_2.png) [@dou2468](https://community.sparkfun.com/u/dou2468)\ **Post date:** [March 30, 2025, 6:02pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/10 "2025-03-30T18:02:07Z")
I try in big open space and the base crashed for overheating maybe(feel very hot the baby helical base antenna) or the postcard has a problem working like base, when use like rover everything its ok, but in base mode crash, some times go from casting to xmitting and restart again. ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [April 1, 2025, 3:24am UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/11 "2025-04-01T03:24:44Z")
I’m using the survey antenna on a pole for more accuracy. But I ordered some stick on heat sinks. Might be time to build a bigger case. I will say I solved my Lora issue and now can get 2 postcards to talk to each. ---
**Author:** ![Jeff\_Post](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/jeff_post/32/9117_2.png) [@Jeff\_Post](https://community.sparkfun.com/u/Jeff_Post)\ **Post date:** [April 29, 2025, 4:27pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/12 "2025-04-29T16:27:45Z")
Congrats on getting RTK communication to work. would you share your configs? I am having no luck after about 4 attempts. I am using the LoraSerial Radios (Custom firmware for one-way communications: [SparkFun\_LoRaSerial/Firmware/LoRaSerial/LoRaSerial.ino.SparkFun\_LoRaSerial.bin at tinker · cturvey/SparkFun\_LoRaSerial · GitHub](https://github.com/cturvey/SparkFun_LoRaSerial/blob/tinker/Firmware/LoRaSerial/LoRaSerial.ino.SparkFun_LoRaSerial.bin)). From the LEDs on the LoraSerial units it seems that data is being transmitted and received. When I look at the output in a serial terminal from the LoraSerial I think the data looks ok ( I am a newb with RTK and I am not sure what a RTCM message looks like but I have read that it is binary… so I am hoping that the mix of gibberish and readable sentences are a good sign) . I have a portability shield on both the base postcard and the rover postcard. I give the base 10 minutes to survey in and it usually gets to a mean of 1/3 - 1/4 of a meter. after the 10 mins the shield on the base indicates it is sending corrections. Radios on both sides blink happily. Rover never indicates it a getting any correction data. Accuracy varies 1.25 Meters + on the display. No white LED anything. at this point I am thinking that the rover is not getting the corrections from the UART the LoraSerials are plugged into. in the field I generally use the Wifi Config screens but there is just not enough info or I am confused about ports/radios / correction data usage from the postcard perspective. Everything is on the latest firmware. ---
**Author:** ![AORPLS](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/aorpls/32/7355_2.png) [@AORPLS](https://community.sparkfun.com/u/AORPLS)\ **Post date:** [April 30, 2025, 11:25pm UTC](https://community.sparkfun.com/t/float-fix-postcard-base-error/64152/13 "2025-04-30T23:25:36Z")
First thing first I had to do was disable most the nmea messages in base mode on the one postcard, I then had to make sure the TX wire on the rover was disconnected because there is no flow control, i was able to hit 2000 feet with default radio settings. It was intermittent but I did not have LOS very good either. Also make sure the baud rate is correct.