Recommended replacement for Omron TR relay?

Todd Boyden

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May 28, 2025, 11:34:50 PMMay 28

to Hermes-Lite

My HL2 from January 2024 is stating to have the failing/sticking relay issue that causes weak receive. I can see a couple threads on here over time talking about fixing it, but I'm not finding a recent part recommendation.

If anyone has a recommendation, let me know and I'll get one ordered. Thank you!

Follow up question: My N2ADR filter board also has Omron relays, are those also prone to failure?

Richard Miller

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May 29, 2025, 2:15:20 AMMay 29

to Todd Boyden, Hermes-Lite

Todd:

A quick look at the BoM shows the original Hermes Lite 2 part (not MakerFabs) can be located here:

- https://www.digikey.com/en/products/detail/kemet/EC2-3NU/4291108?s=N4IgTCBcDaIMwE4EFoCMqAMAWMyCsyAcgCIgC6AvkA

A closer look at MakerFabs assembled boards it appears they are using this part:

- https://www.mouser.com/ProductDetail/Omron-Electronics/G6S-2-DC3?qs=G2FLTrz6JYj8Zl2wrHdJrg%3D%3D

I certainly would not be inclined to change all the relays unless you suspect a problem. That being said I did get into a batch of bad OMRON Relays (different part number) on a High Power LPF assembly used in a 600W HF Amplifier, which prompted me to change all of them on that assembly.

Since it would be unlikely the Hermes Lite 2 and the LPF Filter board are of the same lot, I would leave well enough alone unless you experience problems with the N2ADR board. Removing those relays can be a real pain without the proper tools.

73

Rich, AJ3G

On May 28, 2025, at 11:34 PM, Todd Boyden <toddbo...@gmail.com> wrote:

My HL2 from January 2024 is stating to have the failing/sticking relay issue that causes weak receive. I can see a couple threads on here over time talking about fixing it, but I'm not finding a recent part recommendation.

If anyone has a recommendation, let me know and I'll get one ordered. Thank you!

Follow up question: My N2ADR filter board also has Omron relays, are those also prone to failure?

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Steve Haynal

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Jun 1, 2025, 11:14:52 PMJun 1

to Hermes-Lite

At one point there was a US-based who bought a bunch of compatible relays. We was sending them to people as needed. Use the GUI interface to search this list:

https://groups.google.com/g/hermes-lite

73,

Steve

kf7o

J P Watters

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Jun 2, 2025, 1:13:57 AMJun 2

to Hermes-Lite

Todd,

I sent you a pair of relays via USPS, with tracking and USPS location updates to your email.

From what I have heard and seen, most of the issues with Omron Relays has been in Europe, with only a couple instances here stateside.

..jpw J P Watters

KC9KKO

Morris, IL USA

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Todd Boyden

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Jun 2, 2025, 12:37:49 PMJun 2

to Hermes-Lite

Thanks all for the help! I'll keep you posted on my repairs :D

Todd Boyden

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Jun 6, 2025, 5:43:03 PMJun 6

to Hermes-Lite

Relay replacement was a success! I have reliable receive back. Thank you all for your support!

As part of my early diagnostics I removed D1 on advice from another thread. Should I order and install a replacement D1 diode?

Steve Haynal

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Jun 7, 2025, 7:48:34 PMJun 7

to Hermes-Lite

Hi Todd,

I'm glad your TR relay replacement was successful. I recommend reinstalling D1 as it does provide some high voltage protection for the sensitive ADC.

73,

Steve

kf7o

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