HL2 I/O Board Interface with RF Power Tools LPF Board

[av8to...@yahoo.com]

All:

I am planning on using Jim Veatch's MRF101AN Eval Board along with the T/R Switch and LPF Board for a standalone setup for my HL2. I have the I/O Boad for the HL2, and wondering if anyone has worked with interfacing the I/O Board to the 7 Band LPF Board using BCD?

If there has been any progress along these lines, I would like to hear from you. 

73

Rich, AJ3G

[Tim ZL3PIE]

Hi Rich,

I'm in the process of finishing a half kitset half homebrew amp using Jim's eval board, filter board and TR/SWR board. My approach was to design a controller board to control all functions of the amp, such as band switching and monitoring temps,  volts and current etc. This is based on a 8 bit AVR (ATmega4808) and it speaks to the PC via USB serial. I'm hoping to add direct CAT control for band switching, failing that I'll use a python script to sit between Thetis and my amp control board.

 I don't have an IO board, but that could possibly substitute for a amp control board. Having a amp control board is handy though because I can do stuff like overcurrent protection, SWR protection. thermal protection etc.

Cheers,

Tim ZL3PIE

[Richard Miller]

Hi Mike:

Thanks for sending over this information. I just reviewed the code, and I think I can modify it for my needs. I have a spare LPF Board with the BCD Decoder and Relays here (No LPF Components Populated), I think I can use this to test the modifications I need to make.  I will be also using HR-500, which tomorrow I will review those notes to make sure I do not have a pin conflict. 

Rich, AJ3G

On Feb 25, 2025, at 2:51 PM, Mike Lewis <k7...@hotmail.com> wrote:



I and others have custom firmware that puts out BCD. In my case I use it for VHF bands 6M and higher to control transverters.  It is easy, you can modify the example I linked to how you need it.   I also force the Aux RF on for split IF.

 

K7MDL2/HL2_IO_BOARD_BCD: BCD and PTT outputs for the HL2 IO board designed by N2ADR. VHF band focused, modify to suit your needs.

 

• Mike K7MDL

 

From: 'av8to...@yahoo.com' via Hermes-Lite <herme...@googlegroups.com>
Sent: Tuesday, February 25, 2025 11:11 AM
To: Hermes-Lite <herme...@googlegroups.com>
Subject: HL2 I/O Board Interface with RF Power Tools LPF Board

 

All:

 

I am planning on using Jim Veatch's MRF101AN Eval Board along with the T/R Switch and LPF Board for a standalone setup for my HL2. I have the I/O Boad for the HL2, and wondering if anyone has worked with interfacing the I/O Board to the 7 Band LPF Board using BCD?

 

If there has been any progress along these lines, I would like to hear from you. 

 

73

 

Rich, AJ3G

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[Colin Larsen]

Hi Tim and all

Tim, I'm likewise using the 100w eval board from Jim as well as the TR switch and the 7 band filter. I've gone down the route of using the S21RC SSPA version 2.x lite controller - somewhat modified. The main processor is an Arduino nano so 
modifying the code for my use is relatively simple. The project has a Nextion 3.5" touch screen. Hopefully I'll have it up and running soon :)

https://github.com/s21rc/ldmos_sspa_controller_v2.1_lite

https://s21rc.net

73

Colin

ZL2FL/ZL2ARL

Wellington