ERA 88MHz

Short update: today 10/12 i had a fast and unofficial response from a technician of the local dept of ERA that has no direct responsibilty for the  national transmitter system. IT was clearly a transmitter problem


RE: 88 FM transmission format errors solved and new corrections added in my text

>It took just 2-3 weeks to restore the transmission bugs of ERA First Program 88 MHZ transmitter , after the new political party took place in the government. This was the only FM station out of 65 in my town Thessaloniki suffering from this double problem.
>Two problems happened : background bassy sound plus impulse noise when heard in narrow filtered radios based in Silicon Labs DSP as Degen and Tecsun that made it sounded as garbled . As tested with my SDR there were a few stations with even higher bandwidth that didn't cause any reception problems in any of these radios!
Now both bugs removed and the station is hear properly as all other stations in the band.This happened last September.

Two days ago I received the following reply form a ‘electronics engineer’  :

-This can be a problem with poorly designed DSP and SDR radios

Short Reply :impulse noise is added from the loss of information from filtering a wide band FM signal.

Long reply :This happened many time to me as engineer on satellite TV antennas when tuning to poor wide band TV signals of 36 MHz. As far you narrow down the pass band, the siganal could clear from the noise while new sparkles are introduced in the intense video colours. This technically is called impulse noise

Nearly The same happened with the Silicon Labs DSP used in all Tecsun and Degen radios. Its filter is quite narrow less than 100 kHz There is not an info on the chip's spec guide. This is my estimation from my long practice with them older times. I cold receive moderate signals at every  50 kHz..

Nevertheless this  'engineer' insisted strongly that the problem is caused by the poor design of Degen and Tecsun radios  and poorly designed SDR receivers.He also  insisted that any well designed radio must reduce transmitter faults. 
His logic is totally flawed and that's why:

-why ALL other stations in the band are heard clearly together with the broadband stations? I can receive more than 66 in the town ! 

-why only this transmitter was  heard with garbled audio ?
-And why it happened only to this state transmitter ad not on any others?

-If the problem was in the radios then why the engineers did the service?
He didn't reply to these questions !

I m open for any more discussion on this topic