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Stereo decoding problem

D

dxer2_2000

Up until now, I've been testing the FM setup using my high end Sony tuner & hadn't noticed any problems. However, other receivers ARE having problems decoding the stereo - some switiching slowly between mono/stereo (over a minute or more) & others not getting stereo at all.

Pioneer Car radio w/ super Tuner III - intermittent stereo.
Sanyo boombox - no stereo
Pioneer F-204 AM/FM tuner - intermittent stereo.
Sony ST-SA5ES tuner & Marantz A/V surround Receiver - No problems.

Could this be due to phasing problems from the RDS encoder? - I attempted to turn down the injection level via its potentiometer but it didn't appear to drop much. Unfortuneatly, I don't have access to professional measuring equipment to confirm.

Other than that, things are running nicely!

AEV-4500 RDS encoder connected via MPX input (BNC)
Australian Made 10W stereo TXer - internal Digital stereo encoder.

dxer2_2000
 
> Up until now, I've been testing the FM setup using my high
> end Sony tuner & hadn't noticed any problems. However, other
> receivers ARE having problems decoding the stereo - some
> switiching slowly between mono/stereo (over a minute or
> more) & others not getting stereo at all.
>
> Pioneer Car radio w/ super Tuner III - intermittent stereo.
> Sanyo boombox - no stereo
> Pioneer F-204 AM/FM tuner - intermittent stereo.
> Sony ST-SA5ES tuner & Marantz A/V surround Receiver - No
> problems.
>
> Could this be due to phasing problems from the RDS encoder?
> - I attempted to turn down the injection level via its
> potentiometer but it didn't appear to drop much.
> Unfortuneatly, I don't have access to professional measuring
> equipment to confirm.
>
> Other than that, things are running nicely!
>

You didn't mention how you are syncing the RDS to the 19kHz pilot of the stereo generator. If they aren't synced, this may explain your problem.

An Innovonics monitor may be worth the investment. Compared to the TFT monitors, it is not as fancy, but is a lot cheaper!

> AEV-4500 RDS encoder connected via MPX input (BNC)
> Australian Made 10W stereo TXer - internal Digital stereo
> encoder.
>
> dxer2_2000
>
 
> You didn't mention how you are syncing the RDS to the 19kHz
> pilot of the stereo generator. If they aren't synced, this
> may explain your problem.

The AEV automatically syncs with the pilot. I've done an adjustment to the Stereo output board in the TXer to compensate.

dxer2_2000
 
> > You didn't mention how you are syncing the RDS to the
> 19kHz
> > pilot of the stereo generator. If they aren't synced, this
>
> > may explain your problem.
>
> The AEV automatically syncs with the pilot. I've done an
> adjustment to the Stereo output board in the TXer to
> compensate.
>
> dxer2_2000
>

Sounds like you need to put a scope or monitor on the thing to see what is going on. You definitely are having pilot carrier issues of some sort. Does the issue go away when you disconnect the AEV?
 
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