TR-9

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AX5043 as RFIC?

6

since APRS(AFSK mod) and analog FM are listed in feature list, I'd recommend AX5043 as the RFIC which has **AFSK demod embedded** (vital for power saving by WOR mode) and...

radonyl

Estimated cost and time to build?

3

Hello, I'm interested in building one or two of these. About how much does it cost (in USD) to build one, and how long does it take? 73, KJ7RRV

kj7rrv

Considerations for adding on-board GNSS via a small GNSS SiP chip like the u-blox ZOE-M8B: [u-blox ZOE-M8B Datasheet](https://www.u-blox.com/sites/default/files/ZOE-M8B_DataSheet_UBX-17035164.pdf) Pro's: 1) Provides SPS accuracy (~3.5m) at extremely low power consumption (

KE7KUS

Move the connector closer to the edge of the PCB, so that it's not hidden below the display.

sp5wwp

How about adding a metal frame for RF PA heat dissipation and shielding?

sp5wwp

Both linear regs get warm, how about using DC/DC converters? I know it's an RFI issue ;-)

sp5wwp

@DO5RB: change the position of C86, as it disturbs the arrangement of the two 18650 cells

sp5wwp

Add a Bluetooth module to the v3 of TR-9

sp5wwp

Unify SWD header on TR-9 with HMI

3

As of 9ac1f05, the HMI board and the TR-9 share a different header layout for the SWD interface. Per a conversation with @sp5wwp, it would be nice to unify the...

tkuester

Power output

5

1. Power output is limited to 0.75W. At that power, the bias voltage is 2.9V. 2. There's a high pitched sound audible when PA is active. ALC circuitry works.

sp5wwp