21-03-2018, 05:40 PM
Hi.
Jeffrey I'd say there is little in it to be fair but with the "soft, medium and sharp" switch in the Medium or sharp positions there is notable improvement overall on the picture. The gratings are still visible but the higher frequency ones do appear clearer on "sharp".
I've made a small error in my first post and it's resolving the 5.25Mhz (625 line test card C, converted) they are just visible on Franks converter, the set needs to be spot on though, on the Aurora they are not visible.
I include some photo's off screen, I really need to do this with my proper digital camera on manual, at least it does give some idea.
This is test card "C" 625 lines converted by the Hedghog to 405 lines on Channel 9
This one is feeding the video from the Hedghog into a broadcast standard modulator on CH11, the fine pattern is digital noise from the Imogen test card generator.
This is the test card fed to a later Aurora SCRF and outing on CH5
This is the inbuilt PM5544 test card outing from the Hedghog on CH9
Again sorry for the rather poor pictures but as can be seen there is little difference, the Modulator on both the Hedghog & Aurora do a good job, the broadcast modulator on CH11 is very good and without the pattern from the Imogen gives the best resolution on 405 of all the other sources.
Looking carefully you can see that the result from the aurora is slightly flatter.
I will do a video over the next few days with my decent camera although it is limited to 4 minutes, should be long enough to give a reasonable test.
Looking quickly at the waveforms all seems correct but I'll look in depth tomorrow, although Jeffrey of course is the expert here.
Jeffrey I'd say there is little in it to be fair but with the "soft, medium and sharp" switch in the Medium or sharp positions there is notable improvement overall on the picture. The gratings are still visible but the higher frequency ones do appear clearer on "sharp".
I've made a small error in my first post and it's resolving the 5.25Mhz (625 line test card C, converted) they are just visible on Franks converter, the set needs to be spot on though, on the Aurora they are not visible.
I include some photo's off screen, I really need to do this with my proper digital camera on manual, at least it does give some idea.
This is test card "C" 625 lines converted by the Hedghog to 405 lines on Channel 9
This one is feeding the video from the Hedghog into a broadcast standard modulator on CH11, the fine pattern is digital noise from the Imogen test card generator.
This is the test card fed to a later Aurora SCRF and outing on CH5
This is the inbuilt PM5544 test card outing from the Hedghog on CH9
Again sorry for the rather poor pictures but as can be seen there is little difference, the Modulator on both the Hedghog & Aurora do a good job, the broadcast modulator on CH11 is very good and without the pattern from the Imogen gives the best resolution on 405 of all the other sources.
Looking carefully you can see that the result from the aurora is slightly flatter.
I will do a video over the next few days with my decent camera although it is limited to 4 minutes, should be long enough to give a reasonable test.
Looking quickly at the waveforms all seems correct but I'll look in depth tomorrow, although Jeffrey of course is the expert here.
