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Thread: Low band VHF receiver (kit) needed

  1. #1
    Senior Member Studio1's Avatar
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    Default Low band VHF receiver (kit) needed

    Hi guys,

    What I need is a simple receiver - kit is fine - that will receive 72 - 76 MHz NFM or there abouts, WITH a squelch.
    I know the TDA7000 IC will do this and I think there is a kit, but they're like $80+ and I can't justify that sort of loot for this "once-only" project.

    I'm hoping someone's got one, or something that will do the job, just laying around, and don't have a need for it any more.
    I'm prepared to pay a realistic price for something.



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    Cool

    Quote Originally Posted by Studio1 View Post
    Hi guys,

    What I need is a simple receiver - kit is fine - that will receive 72 - 76 MHz NFM or there abouts, WITH a squelch.
    I know the TDA7000 IC will do this and I think there is a kit, but they're like $80+ and I can't justify that sort of loot for this "once-only" project.

    I'm hoping someone's got one, or something that will do the job, just laying around, and don't have a need for it any more.
    I'm prepared to pay a realistic price for something.


    How about this one? $11.00 Delivered.

    http://cgi.ebay.com.au/New-Compact-AM-FM-TV-VHF-Radio-Receiver-TECSUN-R202T_W0QQitemZ370186262053QQcmdZViewItemQQptZLH_D efaultDomain_15?hash=item370186262053&_trksid=p328 6.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318

    Features :

    • AM/FM/TV Receiver
    • MANUAL TUNING
    • BUILT-IN SPEAKER
    • EARPHONE JACK
    • COMPACT AND PORTABLE
    Specifications :
    • FREQUENCY
      • AM 525 - 1610kHz
      • FM 64-108MHz
      • TV 2-5(VHF.CH)
    • SENSITIVITY
      • FM < 10ÁV
      • AM < 1mV/m

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    Cool

    His on line store has more choice. And the link above not working.



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    Senior Member Studio1's Avatar
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    Quote Originally Posted by beer4life View Post


    How about this one? $11.00 Delivered.

    http://cgi.ebay.com.au/New-Compact-AM-FM-TV-VHF-Radio-Receiver-TECSUN-R202T_W0QQitemZ370186262053QQcmdZViewItemQQptZLH_D efaultDomain_15?hash=item370186262053&_trksid=p328 6.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318

    Features :

    • AM/FM/TV Receiver
    • MANUAL TUNING
    • BUILT-IN SPEAKER
    • EARPHONE JACK
    • COMPACT AND PORTABLE
    Specifications :
    • FREQUENCY
      • AM 525 - 1610kHz
      • FM 64-108MHz
      • TV 2-5(VHF.CH)
    • SENSITIVITY
      • FM < 10ÁV
      • AM < 1mV/m
    Mmm good suggestion there Beer, but two minor drawbacks:

    1) No squelch
    2) The FM will be wideband, I need narrow.

    Thanks for the heads-up anyways.

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    Default

    TDA7000's and TDA7010's are dirt cheap. About $5 each. There are a couple of other motorola chips more suited to NBFM where the TDA7000 is really a WBFM chip.

    You might care to have a look at super regenerative receivers. Simple single transistor radios. Very sensitive, easy to build, slightly tricky to align and tune.

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    second hand scanner? Should be able to get an old cheapie VHF/UHF scanner for less than $50 somewhere out there.

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    E band FM92 and program for what you want

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    Thanks for the suggestions guys.

    I forgot to add that I need something small and compact - a circuit board about the size of a pack of cigarettes would be good.
    So this eliminates options such as a scanner or RT, and it needs to be tuned with a pot, rather than have a display and push button tuning.
    I didn't think it would be so hard to find such a thing.

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    Well NBFM tuning with a pot is prone to drift and you'd have to be constantly retuning to stay centred on your frequency.
    Dick Smith used to have a VHF high band RX kit with 10-turn pot varactor tuning that could possibly be adapted to your 70-80 MHz requirements, but its still three times larger than what you require.

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    Single frequency studio or does it need to be adjustable ?

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    Quote Originally Posted by trash View Post
    Single frequency studio or does it need to be adjustable ?
    Need to tune between 74 - 77 Mhz ideally. Not a hugely wide spread.

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