HDMI RF Modulator
I ordered one of these cheap modulators from China that are on ebay, amazon etc. It's arrived so I gave it a go, it works well and will cover VHF bands, UHF and the cable S bands. Sound carrier spacing can be changed also. The PSU looks a bit suss, not a proper fuse in sight but probably no worse than most Chinese stuff, OK for workshop use but its not earthed and there is about 60Vac leakage on the case. The plan is to insert it into my RF distribution with a Chromecast for an extra analog channel.
Can you disconnect the internal supply and use an isolated wall wart type in its place?
Anyway it’s working as stated.
I've been thinking of getting one of these, there are some cheaper HDMI modulators on sale but seem to be VHF only.
Recently bought an HDMI to analogue converter with the 61.25Mhz VHF output, American channel A3. It works fine but isn't really any use with UK spec 625 PAL TVs because it doesn't do UHF. But to prove it works it was connected up to a Labgear "Televerta" VHF to UHF converter.
However, it will be useful for my American sets because it does NTSC colour so now I'll have a reliable signal source for my RCA CTC7 CTV.
Hi Frank, the CTC7 chassis is presently out of the cabinet. I'll refit it and try out the HDMI converter in NTSC mode. With no input signal the converter generates colour bars. There's a spare CTC7 chassis upstairs sans line output transformer. Could be used for a construction project. It's the early production version which employs two 5U4 valves for HT rectification. Later chassis have silicon rectifiers.
That modulator looks very similar to one I bought a while ago to use with my Motorola 7VT2 TV, good modulator, and could be set to many different frequencies. I might have to upgrade to the HDMI version! I can connect the workshop PC to it and run YouTube straight into it.
I've also got the version with 3 RCA sockets, as well as the wide frequency spread the sound separation can be set for 4.5, 5.5, 6 & 6.5 MHz.
I've also got the cheaper VHF only type, this has an external PSU and a remote control, it works well, it's a pity there is not a UHF version. I may get the RCA version that looks similar, I could use it to connect my vision router to the RF distribution.