Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Help me to make a 800 Mhz oscillator

Status
Not open for further replies.

twilight

Newbie level 4
Joined
Jan 12, 2006
Messages
5
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,283
Activity points
1,329
For my project i need to make a osc. for 800 Mhz.

I want to use the J310 fet, bud i cant find out the max freq. of this device?


Please help me, masters...:D


thnx, greetings Fred.
 

E-design

Advanced Member level 5
Joined
Jun 1, 2002
Messages
2,014
Helped
507
Reputation
1,016
Reaction score
407
Trophy points
1,363
Activity points
14,195
Re: Osc 800mhz?

Depending on your application, a 800Mhz osc can be easily made using a common MMIC amp (MAR series from Minicircuits and others) and resonator. For the resonator you have a wide choice according to stability and noise performance: ceramic, lumped-LC, coax line, microstrip etc.
 

twilight

Newbie level 4
Joined
Jan 12, 2006
Messages
5
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,283
Activity points
1,329
Re: Osc 800mhz?

Manny thanks for the reply's.

I have the schematic, here as attachment, its from an orginal transmitter from Italy. This transmitter works on 800-900 Mhz.

Is this oscillator working streat on 800Mhz, or is it a mulitiplier...

Thnx Gr. Fred.
 

throwaway18

Advanced Member level 2
Joined
Jun 9, 2005
Messages
596
Helped
101
Reputation
202
Reaction score
24
Trophy points
1,298
Location
Kent, UK
Activity points
8,365
Osc 800mhz?

I can't tell from that schematic. We don't know the inductance of the strip lines.
If there is a mutiplier then it is further down the circuit. The part of the circuit you have shown just contains an oscillator and a buffer amplifer.
 

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
4,979
Helped
1,503
Reputation
3,004
Reaction score
1,341
Trophy points
1,393
Location
Turkey
Activity points
30,021
Osc 800mhz?

There must not be multiplier itslef. If the tank circuit is resonated at 2nd or 3rd harmonic, the oscillator may work lower frequencies.Because every oscillator creates harmonics less or more...
 

artem

Advanced Member level 4
Joined
May 22, 2003
Messages
1,350
Helped
126
Reputation
252
Reaction score
32
Trophy points
1,328
Location
Turkey
Activity points
13,461
Osc 800mhz?

i have seen wheather forecast ballon with one element telemetry transceiver . I did not know the frequency but its output was directly connected to 1/4 grond plane antenna about 8 cm length ~ 32 cm wave length.
may be i am wrong.
 

twilight

Newbie level 4
Joined
Jan 12, 2006
Messages
5
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,283
Activity points
1,329
Re: Osc 800mhz?

thnx for the idee's...

i want to build this j310 schematic, and whe will see whats happening...


Second choice is the bf970 oscilator, this one runs well on 800mhz... bud makes some noise....shame... (and obsolete component..)


GR, Fred.
 

kevinj

Advanced Member level 4
Joined
Jan 19, 2006
Messages
118
Helped
8
Reputation
16
Reaction score
4
Trophy points
1,298
Activity points
2,233
Re: Osc 800mhz?

check it. vco.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top