I/O board failure question

[Scott Strehle]

Has there been any failures to the I/O boards that have been reported?  I have two HL2's with I/O boards one for 9 months and 1 for about 6 months.  The other day the newest one started showing a very weak input signal.  I switched things around between the setups and could not find the problem.   Finally I removed the I/O board from the problemed HL2 and installed the jumper between the filter board and the main board and the problem went away.

The symptoms are  there is about 25 db of attenuation on the incoming signals they are there but only strong ones come in.  noise floor goes from -130db to -155db.  After I removed the I/O board signals and the noise floor came back to where the should be and the same as the other HL2.

 Any help would be greatly appreciated.  I do not use any of the functions of the I/O board other than the pure signal port right now but I would like to implement some amplifier and tuner functions in the future.

Thanks

Scott

KJ7RHP

[Martin Hertkorn]

Hello Scott,

i have exactly the same Issue, would be nice if somebody has an answer to this, i removed the I/O board, because of this.

Martin, HA3AN

[James Ahlstrom]

The IO board has two RX antenna inputs. If signals are low on one RX input, change the antenna to the other one to see if that helps.

Jim

N2ADR

[Martin Hertkorn]

Thanks Jim, but the main antenna port for send and receive is also attenuated if the I/O board is installed, 

after replace everything is fine, the same as Scott.

73 Martin

[Ed Grafton]

For giggles, untick the I/O board in Thetis. If that changes the issue, you may have a setting wrong.

[Martin Hertkorn]

I checked it, there is no difference, the signal is attuanated, if i remove the I/O it's ok, i checke the 3 Pins and the alignment of the board it seems everything ok, so i assume there the I/O Board is bad.

I order an new one, if that one is ok, then i know it's the board itself.

73 Martin

[Martin Hertkorn]

Hi there,

just an Feedback, the new I/O Board works perfekt, there’s no attenuated signal anymore,

the first board must have some failure, like Scott’s one.

73 de Martin

[Scott Strehle]

Good to know I was not going nuts. I will order another here to solve my problem hopefully.
Scott

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[Scott Strehle]

The saga continues.  I have not ordered another io board yet but have been using my second HL2.  Last night when I fires everything up my second HL2 now has the same symptoms.  I have not pulled the io board from it yet to confirm.  What did happen was that the power to my house had gone out yesterday.  I am thinking that maybe it was not a coincidence.  I had been powering the HL2 with a Rigol bench top power supply so i would think there was protection to the HL2 from a power spike but who knows.  When I get home tonight I will pull the IO board and confirm if the IO board is the failure.  My 40 meter noise floor had gone from S7 to S3.

Thanks 

Scott

KJ7RHP

[Scott Strehle]

I changed out the io board and tapped into the header board so I could run external pure signal. Everything works fine now. The io board was the problem again. I would like to figure out what is causing the issue though so I do not damage the HL2 board if the problem is on my side of things.

Scott

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