Board-dat/IDD/IDD1013-DAT/IDD1013-DAT.md
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@@ -117,10 +117,15 @@ notice the differences of pin CLK and D
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### Jumper Setup for E-line
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- solder pins on E-18 and add jumper
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-- solder pins on E-SEL1 and add jumper
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+- ~~solder pins on E-SEL1 and add jumper~~
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![](2024-03-01-13-44-43.png)
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+Updated by customer:
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+
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+- 1) putting a jumper to E-18;
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+- 2) consider the panel as 64x64 and set number of panels to 2 instead of 1.
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+
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## ref
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- [[CCO3546-dat]]
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Board-dat/OPM/OPM1168-dat/OPM1168-dat.md
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@@ -13,6 +13,16 @@ https://www.electrodragon.com/product/wireless-charge-receiver-board-qi/?attribu
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- seconds two pads right = - negative GND
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+
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+## charge current
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+
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+Where
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+- IBULK is the programmed battery charge current during fast charge mode. When referring to the application diagram shown in Figure 32,
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+- RILIM is the sum of RFOD and R1 (the total resistance from the ILIM pin to PGND).
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+
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+https://www.ti.com/lit/ds/symlink/bq51050b.pdf
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+
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+
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## ref
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- [[OPM1168]]
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Shipment/weight-dat.md
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@@ -0,0 +1,5 @@
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+
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+# weight-dat
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+
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+- 1KG = 20 usd
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+- 100g = 2 usd
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Tech/Network-dat/RF/RF-DAT.md
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@@ -9,9 +9,32 @@ Sub-1GHz
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+### UHF
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+UHF is a range of radio waves which allows a radio or television receiver to produce a good quality of sound. UHF is an abbreviation for 'ultra-high frequency'.
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+Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).
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+
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+Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range.
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+
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+Lower frequency signals fall into the VHF (very high frequency) or lower bands.
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+
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+
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+### DMR Radio
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+
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+Digital Mobile Radio (DMR) is a digital radio standard that allows for two-way radios to work together on the same network.
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+
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+The European Telecommunications Standards Institute (ETSI) created DMR in 2005. DMR equipment works between 30 MHz and 1000 MHz, with two categories of frequencies:
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+- Very High Frequency (VHF): 30 MHz to 300 MHz
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+- Ultra High Frequency (UHF): 300 MHz to 1 GHz
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+
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+DMR is a TDMA mode (Time Division Multiple Access) that allows multiple users to share a frequency channel by dividing the signal into different time slots. DMR can cover distances ranging from a few hundred meters in indoor settings to several kilometers in outdoor environments.
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+
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+When buying a DMR radio, you can consider things like: Battery life, Power output, Range, License.
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+
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+Programming DMR radios can be complex, so it may be helpful to get sample codeplugs from a local club to get started.
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+
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### REF
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-- [[RF]]
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+- [[RF]] - [[rf-voice]]
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