VHF crystal-controlled "surveillance" transmitter - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th October 2012, 04:02 PM   #1
diyAudio Member
 
Join Date: Oct 2012
Default VHF crystal-controlled "surveillance" transmitter

I found the schematic on www.radio-circuits.com (BBG) and proceeded to build the unit. John S. Wilson Jr. designed this one. I assembled it using parts from Dan's Small Parts and Kits, Radio Shack, and ebay. It took about 4 evenings to finish. In addition to the schematic I added a 2.5mm jack for the mic, RG174 coax lead to an SMA connector for the antenna. The antenna is just a SMA male with a RG174 pigtail. The crystal is a 16Mhz unit from a local surplus store. The coils need to be hand wound but aren't too difficult. All seems to work well.
http://i113.photobucket.com/albums/n...g?t=1351089630
BBG-#1.jpg
  Reply With Quote
Old 24th October 2012, 04:37 PM   #2
diyAudio Member
 
firechief's Avatar
 
Join Date: Sep 2008
Location: Near Seattle Wa
Ok - this is fun stuff. Please post the schematic or a link to it. How many times are you multiplying?
__________________
"You can keep your insurance baby nothing is guaranteed" -Tom Petty
  Reply With Quote
Old 24th October 2012, 05:09 PM   #3
diyAudio Member
 
Join Date: Oct 2012
The circuit multiples the crystal freq 10x. John Wilson's notes say that he gets a 5x increase from Q3/4 and a x2 increase from Q5. The crystal is a 16Mhz and the final freq should be right at 160Mhz.

Here's his schematic. I added the parts directly onto it so it's easier when I build.

John's website is also at www.bugplan.com.
Attached Files
File Type: pdf bbg.pdf (568.2 KB, 68 views)
  Reply With Quote
Old 24th October 2012, 10:03 PM   #4
diyAudio Member
 
Join Date: Oct 2012
Oops. I meant to say that I added the part number information onto the schematic.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
3-way with big (10") woofer and monitor (6.5"+1") on top like "Tarkus" proxii Multi-Way 16 30th October 2012 01:43 PM
"Digitally controlled" Class D chipamp Blinddot Class D 1 14th January 2011 06:15 PM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 07:42 PM
Crystal Controlled Turntable Power Supply peranders Analogue Source 36 31st May 2004 08:33 AM
"Digital" headphone amp from Crystal/Cirrus peranders Headphone Systems 0 19th April 2002 08:36 AM


New To Site? Need Help?

All times are GMT. The time now is 07:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2