[R-390] Spectrum Analyzer

David C. Hallam dhallam at knology.net
Mon Mar 14 10:50:14 EDT 2011


I would agree that a sweep generator is more useful for receiver work.

I do a lot of work with Johnson Invader transmitters and have found that 
my spectrum analyzer has saved me hours of work.  The spectrum analyzer 
was very useful in stage alignment as it was a revelation that maximum 
output did not correspond to the best signal.  Just a slight tweaking of 
mixers and drivers could really affect the signal.

David
KW4DH

On 3/14/2011 9:23 AM, Shoppa, Tim wrote:
> 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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