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RF component help — Parallax Forums

RF component help

KB3JJGKB3JJG Posts: 95
edited 2005-07-17 08:18 in General Discussion
Greetings all,

I just received 1 el cheapo rf setup that I got off ebay. There is no documentation and the seller does not answer technical questions. I really need help identifying·Vdd,Vss and Data on the receiver.· Apparantly this can be used a a virtual wire at 2400 baud, I have played with serin/serout a bit so once It connected properly I am sure I can figure it out but any tips are appreciated!

Some Bullets from the auction of they help!
  • Single 5V operation
  • TTL/CMOS data input level
  • accept any user defined format



This is for a stamp to stamp (both BS2)·application on a budget as I prepare for baby kb3jjg in a few weeks, thanks in advance for any and all help!

73 de KB3JJG



Some pics
rf1.jpg


rf2.jpg

rf3.jpg

Comments

  • Robert KubichekRobert Kubichek Posts: 343
    edited 2005-07-12 21:35
    On the receiver, the antenna is marked, the ground is next to it judging by the backplane,
    the other 2 are the power and data out, cross reference the IC to trace for the data out and power in....
    Also look for any caps to determine positive negitive traces...
    Looks like a saw osc transmitter, and possibly pl receiver...

    What are the power requirements, Volts/milliamps???

    Good luck!

    Bob N9LVU scool.gif
  • mmmm Posts: 56
    edited 2005-07-14 23:04
    Those look like some of the older style MING 300 MHz or 400 MHz AM data transmitter and receiver pairs. Goggle MING and you should be able to find a data sheet on them.

    Mike WB8VLC/7
    Northern AZ.
  • KB3JJGKB3JJG Posts: 95
    edited 2005-07-15 15:56
    Thanks for the tips!! I will give it a shot this evening and post my results!

    PS. Do I need any resistors when using something like this, I am not so knowledgeble in the electronics side of this hobby.
  • mmmm Posts: 56
    edited 2005-07-15 18:25
    As I remember the transmitters ran off of 3 to 12 volts, with 5 volts being optimum. Higher voltage gave slightly longer range. The receivers as I remember are 5 volts and they were made to be 0 to 5 volt output level so they could work with the HOLTEX encoder decoder pairs or the older Motorola encoder decoders.
  • NewzedNewzed Posts: 2,503
    edited 2005-07-15 18:53
    KB3JJG, how did you get those pictures into your post instead of as an attachment?

    Sid
    W4EKQ
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-07-15 19:43
    They were already availible on the net. Looking at the source for this page, he got them from www.anim8or.org
  • KB3JJGKB3JJG Posts: 95
    edited 2005-07-17 08:18
    Paul Is half correct, I did get them from anim8or.org, but they werent readily available, I had to put them there (anim8or.org is one of my websites),· then I just used the add image button to hotlink to the images.· They origionally came from the e-bay auction where I got the items.

    I am looking for info on these parts now, I will post my results!


    ·
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