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Topic: PCI MAX 3000+ v1 high pitch tone
maxmaxxed

Replies: 8
Views: 5278
PostForum: PCI MAX transmitters   Posted: Fri May 17, 2013 7:48 pm   Subject: PCI MAX 3000+ v1 high pitch tone
If it helps, there is a "bodge cap" on the back of the board (across earth and what seems to trace back to pin 7 of the atmel). If I lift this, the tone increases in volume. The primary freq ...
Topic: PCI MAX 3000+ v1 high pitch tone
maxmaxxed

Replies: 8
Views: 5278
PostForum: PCI MAX transmitters   Posted: Fri May 17, 2013 12:39 pm   Subject: PCI MAX 3000+ v1 high pitch tone
I've removed the card from the PC and it's running on a linear bench PSU.

Once the transmitter is running, I've even disconnected the USB feed, but the tone is still apparent.

Disabling stereo o ...
Topic: PCI MAX 3000+ v1 high pitch tone
maxmaxxed

Replies: 8
Views: 5278
PostForum: PCI MAX transmitters   Posted: Thu May 16, 2013 6:52 pm   Subject: PCI MAX 3000+ v1 high pitch tone
Thanks for the info.

I'm running the unit on an external, linear bench PSU. The problem was also apparent when running on the PC PSU.

It is frequency dependent. 91.7 is clean, 92.5 has the tone. ...
Topic: PCI MAX 3000+ v1 high pitch tone
maxmaxxed

Replies: 8
Views: 5278
PostForum: PCI MAX transmitters   Posted: Wed May 15, 2013 11:49 pm   Subject: PCI MAX 3000+ v1 high pitch tone
Thanks Marco.

I'm think I'm being a bit slow but it's not clear to me which component to remove referencing your PDF.

Here's an annotated picture of the components I think your PDF refers to - ...
Topic: PCI MAX 3000+ v1 high pitch tone
maxmaxxed

Replies: 8
Views: 5278
PostForum: PCI MAX transmitters   Posted: Wed May 15, 2013 6:08 pm   Subject: PCI MAX 3000+ v1 high pitch tone
Hi,

I'm experiencing the same issue on my V1 PCI3K unit discussed in the thread "PCI MAX 3000+ v2 high pitch tone" http://www.pcs-electronics.com/phpBB2/viewtopic.php?t=2597

The tone i ...
Topic: MPX and frequency correction
maxmaxxed

Replies: 2
Views: 2729
PostForum: PCI MAX transmitters   Posted: Wed May 15, 2013 6:01 pm   Subject: MPX and frequency correction
Thanks Marko.
Topic: MPX and frequency correction
maxmaxxed

Replies: 2
Views: 2729
PostForum: PCI MAX transmitters   Posted: Mon Apr 29, 2013 6:39 pm   Subject: MPX and frequency correction
I'd like to feed an externally generated mpx signal into my PCI MAX 3000. Can someone please recommend the best point? Ideally I'd like the option of keeping the internal RDS encoder.

I notice my u ...
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