BATC Forum

Hello All,

I am busy to make tests in DBVT 2MHZ bw with the board but I cannot receive the stream on HIDES HV110 receiver.
All tested, last firmware flashed but no way.

I am using the 1.23 version.

Any idea ?

73's ON8GE

Hi

I'm running DATV Express V1.23 on Win 10; video source is vMix. Receiver is a Hides UT-100D with BDA Viewer+

Pictures below of what works and what BDAViewer+ reports:

Hope that helps

Dave
G8GKQ

Thanks a lot, I think I made mistake in SR rate......... I will try.

Can you make screenshot of your SI Table please ?

HI

Here's the SI Table and the system tab

Dave
G8GKQ

BTW, TX and RX running on the same PC.

Dave

Hello Dave,

I tried 4 hours with all parameters combination, no way. Signal is present, but Quality = 0.
RX used HV-110

Pierre

Hi Pierre.... some comments made recently by Phill GW8BVI on GB3ZZ chat line re use of vMix and DATV Express may be relevant.... Good luck..

Hi Pierre,

Please read some of the info here, one of Ken's updates....

http://www.batc.org.uk/forum/viewtopic. ... guo#p11391

Charles has noted that with the right USB2 chipset all is well on DVB-T, I have the same problem,

others may not.

Without buying a new machine, I am using the original Linux program running Ubuntu on a spare Pc.

It uses lower bit rates, so quality not there, but does not have the same pressure on USB2 through put.

https://datv-express.com/CustomPage/Downloads ... DATV-Express v2.03 32-bit i386 DEB or v2.03 64-bit AMD DEB.

You may know some of this but it may help others.

73

Peter

Hi Pierre ON8GE,

On DATV-Express for Windows, the DVB-T protocol USB-traffic has a tendency to “overload” the computer USB-bus-architecture on a slower PC and can even “overload” some newer PC’s that have a poor USB-bus-architecture design. The DVB-T USB-loading is very close to the real-world throughput limits of a USB-2 bus. Charles G4GUO who has performed much DVB-T testing with DATV-Express explains that if the DVB-T USB-traffic to the DATV-Express board can not keep up with the protocol bit-rate/symbol-rate, it creates short drop-outs in the transmission that can upset some DVB-T receivers. In the referenced posting of the 2016-12-01 “DATV-Express report”, Charles reported that “Only one of his three 64-bit computers running express_DVB_Transmitter [Windows] software would allow the UT-100B to lock on his signal.

Also, running vMix on the Windows increases the CPU loading and USB-data-traffic loading. I found that even running DVB-S protocol with vMix on my old (2009) dual-core-3GHz Dell 32-bit notebook caused drop-outs in the transmission and (if I remember correctly) would create receiver freezes every few seconds. I came to suspect that my old dual-core Dell notebook had a low-cost and NOT-high-performance USB-2 bus architecture. As G4GUO describes it, my old Dell had the "wrong USB-2 chip-set". Since I purchased a faster Dell 64-bit notebook (i7 four-core CPU at 3.10 GHz], my DVB-S/vMix drop-out issues have disappeared and I transmit 2 MHz channel-bandwidth DVB-T on Win10 without problems to my HiDes UT-100B receiver…achieving a quick LOCK and without any problems.

What is the speed of the computer that you are using? What Windows operating system are you using?

73…de Ken W6HHC