[HomeBrew] Looking for sweep circuit

[John Marshall]

Loren,

How about the sweep circuit in the W7ZOI/K7TAU QST article "A Spectrum 
Analyzer for the Radio Amateur"?  The article appeared in QST for 
August and September, 1998 (sweep circuit in August).  This design 
doesn't have a separate blanking output, but the waveforms are shown on 
W7ZOI's Spectrum Analyzer page.  Looks to me like the negative-going 
part of the sawtooth could be used with a comparator to generate a 
blanking pulse.  If you don't have the magazine, the article can be 
downloaded from the ARRL web site:

http://www.arrl.org/tis/info/pdf/9808035.pdf  and
http://www.arrl.org/tis/info/pdf/9809037.pdf

Here's another example without a separate blanking output:
http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=6198

Here's another one with no blanking output but it does include a 
separate sync signal for a scope input:
http://www4.tpgi.com.au/users/ldbutler/sweepgen.htm

Hope this helps.  Let us know what you're building!

John, KU4AF
Pittsboro, NC

On Apr 7, 2005, at 1:17 PM, Loren Moline WA7SKT wrote:

> ** Please do NOT cross-post messages when posting to HOMEBREW **
>
> Hello,
>
> I am planning on building sweep generators using Minicircuits VCO's 
> and am looking for a sweep and blanking circuit to control same.
>
> I know I need a sawtooth wave generator and a circuit to blank the 
> output during retrace. Anyone have a predesigned circuit? I can design 
> my own but why reinvent the wheel.
>
> Loren
>
>
>
> Loren Moline WA7SKT  CN86cx
> Member: ARRL, Pacific Northwest VHF Society #151
> 2 Meter EME initials = 55
> 2 Meter EME with 4 X K1FO - 12's, RG-218 7/8"  coax,  IC-820H, and 
> 380W from TE Systems 1452G
>
>
> Hello,
>
> I am planning on building sweep generators using Minicircuits VCO's 
> and am looking for a sweep and blanking circuit to control same.
>
> I know I need a sawtooth wave generator and a circuit to blank the 
> output during retrace. Anyone have a predesigned circuit? I can design 
> my own but why reinvent the wheel.
>
> Loren
>
>
>
> Loren Moline WA7SKT  CN86cx
> Member: ARRL, Pacific Northwest VHF Society #151
> 2 Meter EME initials = 55
> 2 Meter EME with 4 X K1FO - 12's, RG-218 7/8"  coax,  IC-820H, and 
> 380W from TE Systems 1452G
>
>
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