Hi Oyvind,

At 11:52 AM 7/30/97 +0100, you wrote:
>I'm planning on designing a "channels in use" indicator
>for R/C purposes. I know there are commercial units for
>sale, but they are expensive.
>
R/C=???

>I have some ideas, but I'd like to hear other suggestions
>on how to implement this.
>I'm going to use an LCD module and a 16C84 for simplicity.
>I have interfaced this module to the '84 earlier, so that part will be
>easy.
>The hard part is obviously the RF design, and I wonder if anyone
>has any cheap and clever ideas on this.
>I live in Norway, and the RF frequency in question is 35.xxx MHz.
>The channel spacing is 10 kHz.
I made a 10Meter FM transceiver years ago, It is not cheap and clever
design but do works, I used Two Motorola ICs, one is for LO OSC PLL
a MC145162, it works fine unfer 60MHz,Easy to realize 10kHz step
around 35MHz . The other IC is for Receiving a MC13135 complete
dual conversion FM receiver with a RSSI can be used for carrier detect.
Datasheet upon these two ICs can be found on Motorola web.
More you can also try to find some local Radio Amateurs to help you,
I worked a lot of Norway Hams on HF band. :)



Jerry Meng, BA1FB

mailto:ba1fb@qsl.net
http://www.qsl.net/ba1fb