Hermes lite bais fail

[Robert Larivee]

Hello, I recently purchased a Hermes Lite 2. This isn't my first purchase; the previous ones worked perfectly. I received the one I ordered recently, and everything seems to be working, but the bias is unstable. It constantly stays at 1825 mA. I'm using two recommended software programs, but I can't resolve the issue; they display an error. What can I do to fix this problem? I'm writing to you to start! Thank you in advance for your help.

[Steve Haynal]

Hi VE2KTF,

What two software programs are you using to measure the bias? Does the bias change when you adjust it via software and just not stick? I am trying to determine if it is a bias measurement problem or bias setting problem.

73,

Steve

kf7o

[Robert Larivee]

I am unable to adjust the bias of the Hermes Lite with either software; it always remains at 1825mA

[Steve Haynal]

SparkSDR. hl2setup_win

I am unable to adjust the bias of the Hermes Lite with either software; it always remains at 1825mA

Hi VE2KTF,

Please remove the HL2 from the enclosure and try again. This is eliminate shorts from the enclosure.

Please share pictures of the top and bottom of your HL2, especially around the hole which applies pressure to the board/enclosure heatsink. Damaged or stripped components in this area can cause the problem you are seeing.

Refer to the HL2 schematic found at:

http://hermeslite.com/

With a regular volt meter, what voltage do you measure at points bias0 and bias1? What is the low and high voltages for bias0 and bias1 and the min and max software adjustment settings?

73,

Steve

kf7o