Hi Chris,
Thanks for your advice!
We are staying low power so 40-50db should be enough, we're aiming for a
total TX power of around 30-32dbm.
We'll just see how it goes.
And Chris, I really have to complement you for sticking with this project
for 3 years, I've been keeping an eye on it since it started. I hope you're
rewarded well for your persistence!
Daniel VA7DRM
Daniel Mundall
On Mon, Feb 16, 2015 at 11:28 AM, Chris Testa <tes...@gmail.com> wrote:
> On Mon, Feb 16, 2015 at 10:03 AM, Bruce Perens <br...@perens.com> wrote:
>
>> Hi Daniel,
>>
>> I think Chris has been working for 3 years with his CMX991 based radio
>> design and we hope we'll be able to sell the board turn we're about to
>> send in. I concur with Glen's assessment that the data sheets are only
>> half of the information you need and not even accurate in that half.
>>
>>
> Yes it's taken me a long time, but I was learning a lot of the RF from
> scratch; I got my license 3 years ago too.
>
> My experience with the CMX991's PLL was that it was noisy enough to hear
> it in CW. That wasn't acceptable for me. I'm not sure how good the
> CMX994's PLL is in comparison, but I'm using an ADF4360-7 as my IF PLL
> instead.
>
> For DC offsets: The modulator is spec'ed for carrier and sideband
> supression of 40-50 dBc, if I'm reading it correctly. That's because
> there's 0 dBm fundamental output, and carrier and sideband are anywhere
> between -40 and -50 dBm. That's okay for SSB @ <25W, but if you want to
> amplify higher you'll want that at 60 dBc.
>
> Bruce just posted slides on his Hamcation talk, with some annotations on
> my latest schematic to the list; you may find some of it useful.
>
>
>> Also, good test equipment proved essential. I spent a lot on an RF lab.
>>
>>
> I think this was the main issue I had at the start. If you can't see what
> you're making or what's happening, you don't have a very good shot of
> getting it done. A spectrum analyzer & rf signal generator are a must.
> The more tools you have, the easier it is to set up the appropriate tests
> to answer those questions that aren't in the datasheet.
>
>
>> Ours is a more ambitious project, but I think it would be fair to say
>> you could work on this for a year. You'll learn a lot during that time.
>> I hope you stick with it.
>>
>>
> The direct conversion option from CML sounds really interesting. Good
> luck!
>
> Testa KD2BMH
>
>
>> Thanks
>>
>> Bruce
>>
>>
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