Share:
Notifications
Clear all

HDMI RF Modulator

 
mfd70
(@mfd70)
Trusted V-Ratter Registered

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.

IMG 0254
IMG 0253
IMG 0252
IMG 0250

ReplyQuote
Topic starter Posted : 11/12/2019 9:13 pm
Nuvistor liked
Nuvistor
(@nuvistor)
Famed V-Ratter Registered

Can you disconnect the internal supply and use an isolated wall wart type in its place?

Anyway it’s working as stated.

Frank

ReplyQuote
Posted : 11/12/2019 9:26 pm
mfd70
(@mfd70)
Trusted V-Ratter Registered

@nuvistor

This had crossed my mind as I may put it in the attic and would rather that it didn't catch fire. Especially if I could power the Chromecast too from a single supply.

ReplyQuote
Topic starter Posted : 11/12/2019 9:56 pm
RichardFromMarple
(@richardfrommarple)
Trusted V-Ratter Registered

I've been thinking of getting one of these, there are some cheaper HDMI modulators on sale but seem to be VHF only.

ReplyQuote
Posted : 11/12/2019 11:35 pm
Till Eulenspiegel
(@till)
Famed V-Ratter Registered

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.

Till Eulenspiegel.

ReplyQuote
Posted : 12/12/2019 9:58 am
Nuvistor
(@nuvistor)
Famed V-Ratter Registered

Link to previous thread about your CTC7.

https://www.radios-tv.co.uk/community/colour-television/rca-ctc7-late-version/

Good photos of the chassis.

Frank

ReplyQuote
Posted : 12/12/2019 12:34 pm
Till Eulenspiegel
(@till)
Famed V-Ratter Registered

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.

Till Eulenspiegel.

ReplyQuote
Posted : 12/12/2019 7:58 pm
Nuvistor liked
Lloyd
(@lloyd)
Noble V-Ratter Registered

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.

 Regards

Lloyd

ReplyQuote
Posted : 12/12/2019 8:24 pm
RichardFromMarple
(@richardfrommarple)
Trusted V-Ratter Registered

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.

ReplyQuote
Posted : 12/12/2019 11:08 pm
mfd70
(@mfd70)
Trusted V-Ratter Registered

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.

ReplyQuote
Topic starter Posted : 14/12/2019 11:39 pm