[Hallicrafters] (no subject)

[Bill Gerhold]

Cleaver planning?  Like in chop chop.  Hows that?

K2WH

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of DW Holtman
Sent: Tuesday, May 23, 2006 8:33 PM
To: Hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] (no subject)

Rob,

I think it is a great idea. One feature that would be great is if it is 
possible to program in a sweep function. For example, sweep from 445 to 
465 KHZ to align If transformers. The output could be looked at on a 
scope and adjust for the nicest looking band pass. I have two 
generators, both I really like. One is the trusty old Urm-25D and the 
other is a HP 8640B

My concerns are  phase noise,  harmonics, leakage and accurate 
calibration coming from a digital generator.

But, all is possible with some cleaver planning.

Best,
DW Holtman
WB7SSN


Rob Copeland wrote:

>I am a web developer/ electronics tinkerer and I am willing to donate some
>of my time to this project. If there really is a need and there are people
>interested. I am looking to create a modern version of an RF Signal
>Generator that is designed to go down to 10Kc and up to at least 100Mc,
>AM/FM with modulation and xtal ouput, built in Freq counter, super stable
>digital output with automated freq sweep with adjustable ratio and speed,
>all the features that someone would need to work on old radios as well as
>new ones in the ham world.
> The processor I am proposing is here:
>  
>
>>http://www.analog.com/en/prod/0%2C2877%2CAD9854%2C00.html
>>
>>Someone has already designed a RF signal
>>generator using this processor and you can see their project here:
>>http://www.inthelight.co.nz/electronics/dds.htm
>>    
>>
>
>Any Takers? :)
>
>Rob
>-----Original Message-----
>From: hallicrafters-bounces at mailman.qth.net
>[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Jim Brannigan
>Sent: Tuesday, May 23, 2006 1:45 PM
>To: Rob Copeland; Hallicrafters at mailman.qth.net
>Subject: Re: [Hallicrafters] (no subject)
>
>
>Rob etal,
>That query certainly got the juices flowing!
>The URM-25's and the like are good generators, but are heavy, bulky, prone
>to drift and are at an age where they need as much TLC as the BA's they are
>used to service.
>
>Your idea is a good one, but you need to consider some of the attributes of
>an RF generator that make it a great Signal generator:
>
>The box must be extremely well shielded (double or triple). There can be
>only one outlet for the RF, the end of the coax.
>The signal needs to be a clean sine wave with minimum harmonics.
>The output must be adjustable, down to a level less than the sensitivity of
>the best receiver.
>
>Jim
>
>
>
>  
>
>>Hi All,
>>
>>I have scoured the Internet and noticed that modern signal generators are
>>extremely pricey. I have also noticed that most of them are not designed
>>specifically for shortwave use. So I am wondering if it would be benefical
>>start a open source project to build a modern RF signal generator that is
>>affordable and specifically designed for SW use. Anyway, I am thinking
>>this
>>processor:
>>http://www.analog.com/en/prod/0%2C2877%2CAD9854%2C00.html
>>
>>would be great for this purpose. Someone has designed a RF signal
>>generator
>>using this processor you can see their project here:
>>http://www.inthelight.co.nz/electronics/dds.htm
>>
>>It is fairly simple although I think it could be better. With a built in
>>Freq Counter, maybe a 100kc Freq. Sweep with variable speed.
>>
>>Thoughts...????
>>
>>Rob
>>    
>>
>
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