[R-390] Spectrum Analyzer

[Mark Johnson]

Sorry, my previous post...I mis read - the models I stated are for the Spectrum Analyzer....For a Sweep Gen, I use the HP 8601a and a Heathkit IG-1275. I like the Heathkit as it goes low in frequency and like all Heathkits, it's easy to fix and get parts for. 
 
>From experience, always use a capacitor, (.01 mmf), in line with the output of the generator. I once blew a non replaceable HP IC in a previous HP-8601a I had due to voltage being put back into the generator due to my mistake!
 
Mark V Johnson VE3DJU/VE3LU
 
> From: mvjohn at sympatico.ca
> To: brloper at gmail.com
> Date: Mon, 14 Mar 2011 14:33:11 +0000
> CC: r-390 at mailman.qth.net
> Subject: Re: [R-390] Spectrum Analyzer
> 
> 
> I have an older HP 141T with the 8553B RF section and the HP 8552B IF section. I see them at hamfests, complete for around $300 to $500 depending on condition. 
> 
> Mark V Johnson VE3DJU/VE3LU
> 
> 
> 
> 
> Date: Mon, 14 Mar 2011 09:17:14 -0500
> Subject: Re: [R-390] Spectrum Analyzer
> From: brloper at gmail.com
> To: mvjohn at sympatico.ca
> CC: tshoppa at wmata.com; r-390 at mailman.qth.net
> 
> I wanted a sweep generator because I thought it would be more useful, this thing just happened along. Any recommendations on a good inexpensive sweep generator?
> 
> 
> On Mon, Mar 14, 2011 at 9:03 AM, Mark Johnson <mvjohn at sympatico.ca> wrote:
> 
> 
> I have an older HP spectrum analyzer; got it cheap, and use it for looking at transmitter outputs - harmonics etc. 
> 
> I bought some good quality RF attenuators; expensive little beastie's, that allow me to reduce a typical 100 watt transmitter down to a few milliwatts, then feed directly into the spectrum analyzer. Gives a nice view of the signal output. I agree with the previouse posting - if i had to prioritze, I'd keep my O'scope and sweep generator before the Spectrum analyzer....
> 
> Mark V Johnson VE3DJU/VE3LU
> 
> > From: tshoppa at wmata.com
> > To: brloper at gmail.com; r-390 at mailman.qth.net
> > Date: Mon, 14 Mar 2011 09:23:51 -0400
> > Subject: Re: [R-390] Spectrum Analyzer
> 
> 
> 
> > 
> > Many surplus spectrum analyzers are not (by nature) HF spectrum. Many of the ones you'll see on the surplus market are VHF/UHF range. They can be adapted to HF with an upconverter.
> > 
> > If you want to see how squirrely a typical 40's/50's/60's/70's ham transmitter looks during keying it might be of some use :-). Most likely, you do not want to know! Almost all screen tube PA's and drivers of that era will show some parasitic oscillation during keying.
> > 
> > For receiver alignment etc. a sweep generator is far more useful than a spectrum analyzer. Here on this list we tend to focus on the lab-type HP equipment but realistically a Sencore-type TV/Radio service shop-oriented unit will do fine.
> > 
> > Tim.
> > 
> > -----Original Message-----
> > From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Ben Loper
> > Sent: Monday, March 14, 2011 9:15 AM
> > To: r-390 at mailman.qth.net
> > Subject: [R-390] Spectrum Analyzer
> > 
> > I found a good deal on a spectrum analyzer, but I'm wondering how much use
> > it will be working on boat anchors. Are there many alignment procedures
> > that would benefit from a spec analyzer or should I pass on it.
> > 
> > 
> > 
> > “A fire has burned my hut to the ground -- how much better to see the moon!"
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> 
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