[Hallicrafters] (no subject)

[Rob Copeland]

He he he come up with something controversial and it turns the world upside
down. :)

DW:
When you have a chance maybe you could look at these links below and give me
your opinion on the processor I am proposing and the example project link as
well. I would really appreciate some detailed feedback on this from you. :)



TO  ALL: I appreciate the comments good or bad. This is what I wanted to do.
Now back to the question at hand. Is there any one here that would be
interested in being involved in this open source project? If so please email
me at: rob at v6spider.com and I will go over the details of what I propose. I
think there is a need for this. If you want to check out the processor you
can go here:
http://www.analog.com/en/prod/0%2C2877%2CAD9854%2C00.html

or if you want to look at a simple signal generator that was built using
this processor you can go here:
http://www.inthelight.co.nz/electronics/dds.htm

The project that I am proposing will be better than the example above.

Thanks!
Rob


-----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 5:33 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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