Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 8th December 2007, 06:05 PM   #1
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
Default Sig gen for FM alignment, diy?

I want a signal generator for high quality FM tuner alignment. I know the Sound Technology units are supposed to be common, but I never see any come up for sale. I don't do much RF, but have an HP3200B, an old Heathkit IG-42, and a Tektronix 191. Can any of these be beaten and coerced into doing the job? Is there some other semi-affordable unit besides the S-T I should look for? Can anyone suggest a diy circuit specific to the purpose? I can build about anything, but I don't want it to become another multi-year project to finish! Thanks
  Reply With Quote
Old 8th December 2007, 07:24 PM   #2
rdf is offline rdf  Canada
diyAudio Member
 
rdf's Avatar
 
Join Date: Jun 2004
Location: big smoke
Hi Conrad. The ST boxes show up on Ebay regularly, generally in the $300 range for a good one. I already have too many boxes and wonder if something like this:

http://www.aareff.com/1wpllkit.htm

in combination with PC analysis software wouldn't work for most basic setup needs. It's one of the few kits with specs, and they look pretty good.
__________________
Ears aren't microphones.
  Reply With Quote
Old 8th December 2007, 08:39 PM   #3
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
HP8640B is a well-liked one.

I don't know what sort of features you are wanting or needing. But you might want to check http://www.govliquidation.com , using the Advanced Search features to specifiy the nearest warehouses that participate in the big monthly test equipment auctions, and also specify the sale number for one of those TE sales (especially after it's close-enough to the sale date for it to be fully lotted).

You could probably pick up several AUL SG-1144/U units for the minimum bid, and might luck out and get something like an HP 8640B, cheap-enough; probably in the $100 to $250 range, but with no guarantees. (I've actually got a half-dozen or so probably-not-quite-working-perfectly SG-1144/U AM/FM/CW sig gens left over, here. I just hate the thought of packing and shipping them, or even just looking at them.)
__________________
The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
  Reply With Quote
Old 8th December 2007, 09:18 PM   #4
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
The pcb kit is really neat, but the HP unit looks like just what I need, and there's a bunch on eBay. No doubt after Christmas when I have the money, there won't be any to be had, but I'll put it on my watch list. Thanks!
  Reply With Quote
Old 8th December 2007, 10:14 PM   #5
TerryC is offline TerryC  United States
diyAudio Member
 
Join Date: Jun 2005
Location: WA-USA
I purchased the article download for this kit a while back, but don't do enough FM work to justify building it. It looks pretty decent...


http://www.elektor.com/magazines/200...er.58268.lynkx
  Reply With Quote
Old 9th December 2007, 02:43 AM   #6
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default Re: Sig gen for FM alignment, diy?

Quote:
Originally posted by Conrad Hoffman
I want a signal generator for high quality FM tuner alignment. I know the Sound Technology units are supposed to be common, but I never see any come up for sale. I don't do much RF, but have an HP3200B, an old Heathkit IG-42, and a Tektronix 191. Can any of these be beaten and coerced into doing the job? Is there some other semi-affordable unit besides the S-T I should look for? Can anyone suggest a diy circuit specific to the purpose? I can build about anything, but I don't want it to become another multi-year project to finish! Thanks


Wanna borrow my Sencore SG165? I picked one up on EBay a couple years back.
  Reply With Quote
Old 9th December 2007, 04:46 PM   #7
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
Very generous Jack, but I've a need to own! In fact, I've got a bid in on one of those right now. I'm still lusting after the HP unit, and if I get one of those, I can probably sell off my other RF generators. All the other generators are just LC oscillators, and I can't believe there isn't some simple way to add limited FM capabilities with a varactor diode or something.
  Reply With Quote
Old 15th December 2007, 06:57 PM   #8
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
Well, an HP 8640B should be on its way to me soon. No idea of the condition, but it went for less $$ than the Sencore SG165 did, and I am an HP snob.
  Reply With Quote
Old 15th December 2007, 09:17 PM   #9
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Conrad, that is shocking. I thought the 8640's went for $600 or so.

I have a 3336B Synthesizer from HP and I use it all the time.

I bought my Sencore for less than $30.
  Reply With Quote
Old 15th December 2007, 09:58 PM   #10
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
IMO, the best time to buy test equipment is during the holidays, on friday night, or whenever you think people aren't paying attention. I think the SG165 went for around $160 or $180. An eBay search of completed will bring it up.
  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
DIY Time Alignment. clipto333 Car Audio 32 4th January 2011 05:48 AM
QB5 Alignment bigboy Multi-Way 1 19th September 2008 09:16 AM
Using MJK´s alignment tables VelluPiri Multi-Way 2 23rd October 2006 02:22 PM
Alignment Type teodorom Multi-Way 4 17th May 2004 11:21 AM


New To Site? Need Help?

All times are GMT. The time now is 10:27 PM.


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