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Leak TL which decoder?

Discussion in 'classic' started by Linnovice, Jan 26, 2021.

  1. chartz

    chartz If it’s broke fix it!

    For those who want to do an amusing experiment...
    Take a Trough Line and another tuner next to it and be amused to be able to change the other tuner's stations with the Leak and note the 12 Mhz (not 10.7) difference on dials!
    This little experiment actually checks the presence of IF quick and dirty. Then grab the frequency counter and the scope...
  2. ersel

    ersel Member

  3. Linnovice

    Linnovice pfm Member

    Oh dear. I’ve just caught up with the thread again. It got very volatile.

    I’ve still got my TL in the background whilst fettling in my workshop. Very comforting it is too.

    I’ve very recently updated the DAC in my listening room and, coupled with a Bluesound Node 2, it’s producing some superb internet radio. That’s thrown another cat in the pigeons scenario.

    I have come to one solid conclusion though. I’ve spent months/years mucking about tweaking and changing units. In the end though. Does it really matter what you listen on? When you get to a reasonable level the music sounds good. Not as good as being there but good enough to allow one to enjoy it. Instead, I think, a lot of people get hung up on listening to their system and completely loose the enjoyment of the music!

    I suppose that is the marketing man’s dream on a Friday afternoon
  4. FrancisClement

    FrancisClement pfm Member

    I have just stumbled across the thread and the strong feelings piqued my interest because I have one of Tim De Paravicini's blue boxes that was built by himself. In addition, somewhere in the attic there is a Troughline Stereo Tuner that Tim modified for use with his decoder!! Give me a day or 2 to search and will try to put the two pieces together and have a good listen. It will not settle any disputes but I can compare the results with a NAT 01!!

    Big John likes this.
  5. FrancisClement

    FrancisClement pfm Member

    I put it all together and had a long listen both in a Naim system and also via STAX SR 404 Signatures. The sound quality is truly excellent but the criticism is that co channel interference is poor. I need to set up a better aerial but the results are very encouraging. Tim de P certainly made a truly excellent decoder and the Troughline is a good source to go with it. Is it a NAT 01? - I don't know as I need to put it on the STAX set for a while and use the aerial that the Troughline used. BTW the aerial was a George Johnson invention!!
    Big John likes this.
  6. George J

    George J Herefordshire member

    Goodness that takes me back! I made several variants of aerials for VHF-FM in the old days.

    I did not invent them! But I did make two types based on 75 and 300 ohm designs - a copper pipe di-pole and a copper pipe formed into a circle with a tiny gap connected to 300 ohm ladder line to connect to my then Trough-Line Two. I cannot remember the precise dimensions now, but I looked up the references in print in reference books [remember those!] and especially the 300 ohm ring worked superbly. It was scaled to tune best at 93 M/cs for Radio Three [from the Ridge Hill mast, Much Marcle, Herefordshire]. I remember it was about 1012 mm in diameter.

    Nowadays I have a simple 75 ohm wire di-pole. After much experimentation, I lengthened the di-pole arms again to optimise for 92.7 M/cs for Radio Three from the very powerful Sutton Coldfield mast. For a while I ran this horizontally, which brings a small degree of directionality to the reception. One day I turned it vertical, having discovered that Sutton sends in both vertical and horizontal polarity. The advantage of a vertical aerial is that it is much less obtrusive and works just as well. I have mine suspended from a hook, and it has a small wooden block attached at the bottom which keeps it absolutely plum. It also returns to where it should be if disturbed. Being thin wire it has now completely de-kinked after a couple of years.

    I have the di-pole on an east-facing wall catching Sutton Coldfield at a bearing of approximately 047 degrees [ie. north-east], though this is no longer relevant using the aerial vertically.

    I use this old tuner daily. It will be sixty-four years old in a few months!

    I love reading threads like this. Thanks to everyone posting here.

    Best wishes from George
    Last edited: Apr 1, 2021
  7. FrancisClement

    FrancisClement pfm Member

    I have set up the aerial properly with 26 km line of sight to the radio mast. The tuner needs to be allowed to warm up of course and then the fluorescent bands on the strength meter almost touch in local mode. The results are really pleasing with excellent sound quality and no hash and the tuner rejects the stations close to the intended signal properly.

    OK I am in Spain but the Spanish Radia Classica gives some really excellent live music - classical, jazz, flamenco etc. Sound balance is excellent and stereo image is very good. So there you have it, a real bargain when you consider the £50 for the tuner and probably £300 for the EAR decoder. On top of that there seem to be no plans to remove FM in Spain. Do I sell the Troughline or the NAT 01????????

  8. TheDecameron

    TheDecameron Unicorns fart glitter.

    FM Yagis seem to be almost extinct. My remaining one is about 14 years old and has been battered by storms from the sea a hundred yards away in all that time. Some of the elements are waggling about in the wind now, so I bought an Antiference 5 element replacement on Amazon. Just need to get it fitted next as my days of going up on the roof are over I think.
    Last edited: Apr 6, 2021

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