New HL2 user transmit issue

[KC3KOP]

Hello everyone,

My name is Ian - KC3KOP. I purchased the HL2 back in December 2025. I believe the T/R relay is buzzing horribly. This happens when I go into a dummy load or antenna. I have shut off the PA and tested for power at RF1. I currently do not have a meter to read that low accurately, but my meter on 5W range does have meter deflection when I put the HL2 in transmit. I have tried SDR console, SparkSDR and Thetis software so far with no success. I have tried the software on 3 different machines with different Ethernet cords. I plugged them in straight to the computer and a then into a network switch. With some basic network logging, the HL2 is using 44Mbps running 192k sample rate. I have pinged the HL2 and the following: 

32bytes of data sent, time less than 1ms TTL=128

I will take it apart this weekend and take pictures of the board. I do have a microscope with a camera so I can take picture of an area if needed.

 

I followed the instructions in this link https://github.com/softerhardware/Hermes-Lite2/wiki/Hardware and did not find any problems.

 

This is my first time posting and I am following tests and instructions from these links

https://github.com/softerhardware/Hermes-Lite2/wiki/Repair

https://github.com/softerhardware/Hermes-Lite2/wiki/No-Transmit

 

YouTube links to my Hermes Lite transmit issue.

Thetis https://www.youtube.com/watch?v=6F5svpJnh8w

Spark SDR https://www.youtube.com/watch?v=uEtFsAXg_-E

Thank You for any help

73

Ian – KC3KOP

[Volker E.]

Hi,

i have the same issue specially on 40m. 

When i lower the power for tuning, the problem most time is gone.

You can set the power for tuning settings in Thetis -> setup -> transmit -> tune section

I have no idea why this happens....

73
Volker, DL1VE

[Volker E.]

I have an idea....

How much voltage do you use? Maybe low voltage can be the problem. 

When i use my lifepo and the voltage drops to 12V i get often this problem. 

I think with the power supply and 13.8V i never had this issue.

73

Volker, DL1VE

[KC3KOP]

Thank You for the Reply.

I have adjusted the Tuning Power, I have it backed down in hopes that this issues does not ruin the board. I will work on trying a different power supply. At this point I am losing faith that this will solve it. I spent the weekend running my Flex at 100w off the same power supply. I measure 13.70VDC the plug. Center pin is positive. I have installed inline 3A fuses between the power supply and the hermes.

Thank you for the help

73

Ian

[Mike Lewis]

Did changing the latency setting improve anything?

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[Steve Haynal]

Hi Ian,

What is the temperature, current draw and SWR reported by software (preferably Quisk) during your TX attempts into a dummy load? Can you post a screenshot of your software filter settings?

Do you feel comfortable connecting a dummy load directly to the HL2 via the pins on the header? This is to determine if the problem is with the N2ADR board or the HL2.

If we can't figure out the issue, I will authorize a warranty return or exchange with Makerfabs.

73,

Steve

kf7o