Originally Posted by jvvh5897
One of these new ZAT-970A b was brought to me for testing the other day..
A while back, looked at one of the ZAT-970s in a white box .
The tuner was labeled DARQ59-6R-E:
Inside the shield was:
S3W - 3 lead Transistor, maybe BFG31R
R25- 3 lead Transistor, low noise VHF/UHF
R25-3 lead Transistor, low noise VHF/UHF
TDA6509ATT, Phillips PLL, 3-band Mixer Oscillator
CS5797 32 lead
A77000 2QN2 16 lead
Sanyo Semicon Device LA77000V
Monolithic Linear IC VHF Band RF Modulator USA, CH-3,4
3234 8 lead
==== Other components outside Tuner shield ======
8 lead, 8-pin serial BIOS chip
27.000 MHz xtal
*Large 104 pin device, covered in heatsink) maybe demodulator, 26 pins per side (4 sides)
Hynix H5DU2562GTR-E3C, 256 Mb DDR
* Without removing the heat sink, Guessed the large device, might be Realtek RTD2885S (demodulator)
Did a bit of bench testing:
The tuner, having apparently three separate bands (VHF-Lo, VHF-Hi, and UHF) rejected FM and cross-band signals better than the ZAT-950 and the ZAT-970 (both version with Microtune wideband tuner). You all probably know that later versions of the ZAT-970 used the Microtune wideband tuner, whereas the earlier 970s used the Sanyo tuner.
Was hoping the demodulator in the white box 970 might have improved over the very good Auvitek unit (apparently used in all the early versions). But, have not been able to make a direct comparison in a difficult multipath scenario.
Seems to be no relationship of this particular ZAT-970 to earlier versions ZAT-950 or ZAT-970s