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Cristar_Ingram

Contributor

Registered: 2019-07-06

Posts: 5

[solved] RDV4.01 LF antenna problem

Hello,

Just after I got the new rdv4.01, I set it up.
I followed the instructions of RRG repo.
But the hw tune says LF is unusable. Can't read LF tag either.

The problem is definitely not firmware (flashed the latest twice)

After several manipulations I think I figured out the problem.
Actually I have to bend  the antenna to make it working :

                                                                  |
                                                                  |
     -----------            LF                                  |
    |            |    ----------------                           ▼
    | usb      |=========================
     ----------- ▲                                   HF
                  |
                  |
                  |
     
With sufficient pressure (but not too much, I won't break it), I could achieve 80 V in the configuration F = 125 Q = 14
It is strange because I used a bipmeter between PWR and RAW and it beeps clearly when the PM3 is off.

I suspect a bad connection enter the main board and the antenna even with a good clamping of screws.
Maybe the screws are not conductive enough or the antenna is faulty.
Should I clean the connectors even more ?

I'm not sure of what to do because it is the brand new antenna system which has not been tested by many people yet.

Last edited by Cristar_Ingram (2019-07-10 17:52:34)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,537

Website

Re: [solved] RDV4.01 LF antenna problem

Interesting,

How do you put the antenna?  Over the pcb or under the pcb?
Is there any material on the connector plates (screw holes) ?  There is the yellow protective pads that might have been in the way.

Normally assemble the antenna above pcb using the screws firm,  but not crasy hard.

Cristar_Ingram

Contributor

Registered: 2019-07-06

Posts: 5

Re: [solved] RDV4.01 LF antenna problem

I did the tests in the same config than the PM3 was sent to me: Antennas above PCB.
I checked pictures on https://sneaktechnology.com/product/001/ , it was correct
Nothing to obstruct contact.

But now I'm almost fixed, my hardware had definitely a problem:
After several attempts of hw tune, a resistor (I think it is) came to burn , and some IC were abnormally hot.
So I'm turning to Lab401 to manage it.

Still, thank you for your support !

iceman

Administrator

Registered: 2013-04-25

Posts: 9,537

Website

Re: [solved] RDV4.01 LF antenna problem

Sounds like an good idea to RMA it.

Cristar_Ingram

Contributor

Registered: 2019-07-06

Posts: 5

Re: [solved] RDV4.01 LF antenna problem

You were right !
Now I have a perfect voltage on LF when hw tuning
Thank you again for your spontaneous answer.