Wideband FM receiver 50-70MHz - Electronic Circuits Projects Diagrams Free

stickpin · 13th June 2008, 06:37 PM

The only circuits i can find is the TDA7000 chip which are awful.

I need good audio wideband FM receiver (able to pass MPX stereo and RDS) and tunable from about 50-70MHz.

Anyone good with radio receivers? really need a bit of help with this, i thought starting with the TDA7000 would be a good choice but obviously not. I see circuits for these and they use alot of coils, there seems to be quite a bit to them.

Thanks

Papabravo · 13th June 2008, 06:49 PM

Were are you going to find a wideband FM signal with stereo to listen to? That spectrum will go dead in about 8 months when Analog TV broadcasting in the US comes to an end.

stickpin · 13th June 2008, 06:53 PM

Quote:

Originally Posted by Papabravo

Were are you going to find a wideband FM signal with stereo to listen to? That spectrum will go dead in about 8 months when Analog TV broadcasting in the US comes to an end.

Basically, i am only familiar with transmitters.
If you get me

illiraj55 · 13th June 2008, 07:09 PM

i want hi range fm transmitter near 300v dc used & fm /am receiver all bad receiver how give me idea & circut

kchriste · 14th June 2008, 03:35 AM

Why not just modify a standard FM receiver (88-108Mhz) to receive on 50-70Mhz by changing the 1st LO frequency (To say 60.7-80.7Mhz) and rebuild the RF front end? That way you'd avoid all the coils, etc in the IF section at least.

Papabravo · 14th June 2008, 07:17 PM

Quote:

Originally Posted by stickpin

Basically, i am only familiar with transmitters.
If you get me

Would those transmitters be of the unlicensed variety?

stickpin · 19th June 2008, 11:07 PM

Quote:

Originally Posted by kchriste

Why not just modify a standard FM receiver (88-108Mhz) to receive on 50-70Mhz by changing the 1st LO frequency (To say 60.7-80.7Mhz) and rebuild the RF front end? That way you'd avoid all the coils, etc in the IF section at least.

sounds like quite a possible idea. However i'm not good on my radio receiver theory atall.
bit stuck!

Mikebits · 19th June 2008, 11:32 PM

With little knowledge of RF circuits, your attempt to reverse engineer a radio would be futile. Your best bet is to purchase a FM receiver kit. For example:
http://www.hobbytron.com/pdf/fr146E.pdf
Even to tweak this kit you will need some RF knowhow to adjust the input circuits and VCO components, but it is possible. Perhaps if you study the circuits, and see if you can come up with values needed to operate at the range you want. I am sure there are peeps here that could assist you once you have studied what needs to be done.
Here is the link for the mixer IC.
http://www.nxp.com/acrobat_download/...ets/SA602A.pdf

I have to ask, why 50 MHz ?

stickpin · 23rd June 2008, 12:03 AM

Quote:

Originally Posted by Mikebits

With little knowledge of RF circuits, your attempt to reverse engineer a radio would be futile. Your best bet is to purchase a FM receiver kit. For example:
http://www.hobbytron.com/pdf/fr146E.pdf
Even to tweak this kit you will need some RF knowhow to adjust the input circuits and VCO components, but it is possible. Perhaps if you study the circuits, and see if you can come up with values needed to operate at the range you want. I am sure there are peeps here that could assist you once you have studied what needs to be done.
Here is the link for the mixer IC.
http://www.nxp.com/acrobat_download/...ets/SA602A.pdf

I have to ask, why 50 MHz ?

cheers.
why 50MHz?
covers a good distance with not much power
fairly wideband
the band is pretty clear

thats basically it.

**Nigel Goodwin** · 23rd June 2008, 08:48 AM

Quote:

Originally Posted by stickpin

cheers.
why 50MHz?
covers a good distance with not much power
fairly wideband
the band is pretty clear

thats basically it.

And do you have a licence to use that band?.

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13th June 2008, 06:37 PM	(permalink)
stickpin	Wideband FM receiver 50-70MHz The only circuits i can find is the TDA7000 chip which are awful. I need good audio wideband FM receiver (able to pass MPX stereo and RDS) and tunable from about 50-70MHz. Anyone good with radio receivers? really need a bit of help with this, i thought starting with the TDA7000 would be a good choice but obviously not. I see circuits for these and they use alot of coils, there seems to be quite a bit to them. Thanks Last edited by stickpin; 13th June 2008 at 06:38 PM.

13th June 2008, 06:49 PM	(permalink)
Papabravo	Were are you going to find a wideband FM signal with stereo to listen to? That spectrum will go dead in about 8 months when Analog TV broadcasting in the US comes to an end. __________________ We never have time to do it right; but we always have time to do it over.

13th June 2008, 07:09 PM	(permalink)
illiraj55	i want hi range fm transmitter near 300v dc used & fm /am receiver all bad receiver how give me idea & circut

14th June 2008, 03:35 AM	(permalink)
kchriste	Why not just modify a standard FM receiver (88-108Mhz) to receive on 50-70Mhz by changing the 1st LO frequency (To say 60.7-80.7Mhz) and rebuild the RF front end? That way you'd avoid all the coils, etc in the IF section at least. __________________ --- The days of the digital watch are numbered. ---

19th June 2008, 11:32 PM	(permalink)
Mikebits	With little knowledge of RF circuits, your attempt to reverse engineer a radio would be futile. Your best bet is to purchase a FM receiver kit. For example: http://www.hobbytron.com/pdf/fr146E.pdf Even to tweak this kit you will need some RF knowhow to adjust the input circuits and VCO components, but it is possible. Perhaps if you study the circuits, and see if you can come up with values needed to operate at the range you want. I am sure there are peeps here that could assist you once you have studied what needs to be done. Here is the link for the mixer IC. http://www.nxp.com/acrobat_download/...ets/SA602A.pdf I have to ask, why 50 MHz ?