SXA Portophone VHF handy

SXA portophone is a 6 channel VHF handy available in junk for approximately Rs.300. I bought 2 nos recently. It needs 2 crystals. I have been looking for information on crystals and tuning information of SXA.
Recently Allen Antony, SWL, provided with me all the necessary information.

Tx crystal frequency= f/8
where f is the desired transmission frequency
Rx crystal frequency = (f – 10.7) /3

It seems there are 2 versions of SXA available one with 2 watt and the other with 5 watt power output.
These set were used by Kerala police ( probably some 10 years back). I am yet to trace the manufacturer.
I have scanned and made a jpeg from the sheets Allen has provided. He has also given me detailed handwritten notes on tuning the set for Amateur band. I am yet to try it. I will post details as soon as I do it.
A big thanks to Allen for the help.
The transmitter layout is here and the receiver here

Update: 27 April 2008

The original design of SXA portaphone is by design. There is an article on SXA in the Elektor magazine December 2007 issue. The handies that I have , are manufactured by West Bengal electronics corporation.

My friend Allen (VU3AUZ) has successfully converted the SXA to cover the entire 144-146 band with a DDS VFO.

I have seen service manual of SXA during once of the hamfests. I would love to get hold of a copy.


  1. Dear Nakesh,

    I am a Ham (VU2KDS). I am also trying for the crystals for SXA, discussed about them with VU2RM. He suggested to try with Andhra Electronics. Please let me know the tuning proceidure. If I get the crystal source I will inform you. Please send a mail so that we can correspond each other the developments.

  2. sir
    i am from mumbai and currently studying electronics engineering !
    i will be giving the lic. exam soon
    i would like to know if there are still some of these SXA,s available…

  3. Crystal is available.Calling Frequency-145.500mhz,and repeater for kollam,trivandrum pathanamthitta districs are available.


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