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]
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 Roon'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.
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