Wednesday, March 2, 2011

Re: RE: [HamBrewers] Air Band Receiver

 

On 03/03/2011, Sandeep Lohia <sandeeplohia12@gmail.com> wrote:
> A simple SW AM reaceiver, most of them can be brought to air band,
> just replace PVC2J with FM gang and decrease the turns of oscilator
> coil mentaining the difference of 455 kcc. In totall there are three
> coils in single core for bandpass, oscillator and
> mixer/downconverter. One just needs to replace the gang and the
> antenna coil. However the selectivity/stability is not so good. For
> more professional design I saw somewhere in SMOVPO website. Adding
> a jfet preamp is always better it also increases sencivity. I have
> also seen a design somewhere by our very own VU2ZAP OM Raj, if I am
> not wrong. Which has also AGC stage, an advance design using SA 612
> but needs some alternations for VHF mostly with inducters one can
> understand easily, this is the best design ever seen. 73's VU3SXT
> message typd frm
> mobile phone in local train plz dnt mke issue with mistakes.
>
> On 02/03/2011, SATYAN VU3MES <satyansarath40@ovi.com> wrote:
>> hi
>>
>> if some one wants to listen only to airband transmission on vhf, there is
>> a very simple way by which you can do it provided you have a decently
>> sensitive fm radio. the technique is to listen to the image frequency by
>> peaking the IF transformers which are usually 10.7 mhz. if i want to
>> listen the chennai area control on 118.9 i should tune to 98.5 which is
>> less by double the IF frequency.
>>
>> i used to try this method long back when i was not having a proper radio
>> with airband coverage. the only drawback is the coverage will be upto
>> 128.7 mhz and not above that.
>>
>>
>>
>> 73s de VU3MES
>> chennai - india - qth location website.
>> http://www.findu.com/cgi-bin/find.cgi?call=vu3mes
>> http://www.qrz.com/callsign/vu3mes
>> http://www.satyansarath.param.mobi [mobile web page]
>>
>>
>>
>> ----- Original message -----
>> From: "Raj‎" <vu2zap@gmail.com>
>> To: HamBrewers@yahoogroups.com
>> Subject: RE: [HamBrewers] Air Band Receiver
>> Date: Wed, 02 Mar 2011 20:39:26 +0530
>>
>>
>>
>> A regen Rx with a front end pre-amp is quite OK. This stage blocks the
>> regen oscillation.
>>
>>
>> SA602/612 NE602/612 Etc.
>>
>>
>>
>> I once constructed Tony Van RoonÂ's rx and it worked. Apart from that
>> I have built couple of Regen Rxs – they tend to receive all
>> conversations simultaneously. Also, they are very dangerous because
>> they radiate via the antenna causing QRM and should not be used
>> anywhere near Airport – they can cause serious qrm to aircrafts in
>> range also.
>>
>>
>>
>> Rajesh K
>>
>> KC2KBY/VU3RGK
>>
>>
>>
>> -----Original Message-----
>> From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com]On
>> Behalf Of Vignesh Kumar
>> Sent: Wednesday, March 02, 2011 9:18 AM
>> To: HamBrewers@yahoogroups.com
>> Subject: [HamBrewers] Air Band Receiver
>>
>>
>>
>>
>> Hello Friends,
>>
>>                 I want to build a Simple Air Band Receiver. Can
>> anybody suggest AM receiver ICs for VHF band?
>>
>>
>>
>> --
>> Raj, VU2ZAP
>> Bangalore, India.
>>
>>
>>
>> ----------------------------------------------------------
>> Ovi Mail: Making email access easy
>> http://mail.ovi.com
>>
>>
>

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