David Lions wrote:

> I would like to add the functionality of a VCR, but without the tape
> deck part.

  Second hand VCRs with crook transport are a "dime a dozen".  Cadge
from the video shop repair department.  Garage Sales.

> There must be a lot of old TV's that could use a device like this.

  Matched by lots of dead VCRs.

> I have absolutely no idea about TV transmission.

  That's a *very good reason* to do the above ;-)  All the following
will be on the understanding you want to learn about TV, not because
it is practical to make your own VCR.  Except from a kit, like the E-A
Teletext Decoder etc., but that's only if you want to spend money.
Cheaper to buy new VCR!  (Less than $400 at Big W)

> I understand that it's transmitted on a carrier frequency, but I will
> have to look up the frequencies for my area

  Try the Dick Smith cattledog.

> (we use PAL standard, and I need to get VHF and UHF channels).  Is
> there a world standard for the frequencies they transmit on?

  Might be, but we wouldn't use it here! :<*)

> Am I on the right track?  It might be easier to make a VCR out of
> coconut shells like on Gilligan's Island.

  Now you're getting the idea!

> Can I buy a pre-built module etc?

  It's called a VCR!  See above (i.e., second hand machine; E-A project)

> Then comes the remote control bit.  I can get an old remote control
> from a broken VCR somewhere - which will have a nice case and buttons.

  Vorlac had some a while back.

> For the power switch is it better to use a relay or a triac to switch
> on the TV?

  Much to be said for a relay.
--
  Cheers,
        Paul B.