mcHF TCXO error: MCP9801 not present

-
Since December 2018 the MCP9801 chip is an option in the mcHF. However, the printed circuit is still routed, only missing the component MCP9801 that is not mounted in factory.

If you want to avoid the delay at startup with the M0NKA software or the "SENSOR!" error message on the display with the USHDR Software, soldering the MCP9801 chip is easy








The TCXO field value show an abnormally high temperature because MCP9801 has just been soldered to the printed circuit and remains hot.

The MCP9801-M chip in SOP-8 format can be purchased for € 0.72 on Aliexpress.

https://www.aliexpress.com/item/32831010653.html?

Comments

Post a Comment

Popular posts from this blog

MiniPA-70 and MINIPA-100 step by step

-
Image
The difference between transmitting with 5 or 12 watts of power in practice will not reach half a unit "s" in a remote receiver, however, that can be the difference in critical conditions to achieve a QSO. But the mcHF behaves much better emitting with its nominal power of 5 Watts, that's why a "help" in the form of linear amplifier is a better option when necessary. MINIPA-70 or MINIPA100 is a good  and unexpensive "help". My recommendation is first separate the supports of the transformers T1 and T2 (cut them from the printed circuit) and then solder the components of small size. Leave the fan and PTT connector for the end. These connectors prevent solder other nearby components and can easily melt due to excess heat. In this way the transformer T2 is built. The two small metal tubes are the half turn of the primary. Use a 100 Watt flat tipped soldering iron to build T1 and T2 and solde their brackets to the printed circuit board. Con
Read more

Modification in mcHF V06 to make accessible the jumper P6 on UI-board

-
Image
The P6 jumper, located near the MCU, allows you to write the bootloader for the first time (in a new MCU) or also to replace the bootloader when necessary. The problem is that jumper P6 is located on the inside face of the UI board. It is highly recommended to "extend" the jumper towards the edge of the UI board. In this case, I stuck a waste of a female connector with glue and made the male jumper by joining two pins of a male connector. In this way you can rewrite the bootloader without having to disarm almost completely the transceiver.
Read more

mcHF V06 TX-RX antenna switching: Pin diodes vs Relay

-
Image
See also related post. mcHF V06 TX-RX relay antenna switching as implemented by Wolfram PY2BND This is the modification that I just made in my mcHF V06, inspired in df8oe RF-04/05/06-H-029   upgrade. In my case, I had to make the modification due to failure of pin diode D3. Clic here to see the df8oe modification Click here to see "The pin diode circuit designer' Handbook" The variant has been to connect a G6S-2 signal relay as a switch of the antenna signal, but taking care that capacitor C81 is earthed in TX mode. Else, in RX mode, the antenna is isolated from PA out. In this way, the shunt function of D4  pin diode is emulated. Protection by diodes 1N4148 -or similar- has always been discussed because the intermodulation effect that would cause an incoming strong signal exceeding 500 mV .Unlike df8oe, I used an NPN transistor to pilot the relay. Now switching transition between RX and TX is done the way that the RX band-pass is complet
Read more