[sdiy] Transformer question ( skin effect )

[Harry Bissell]

seems the same issues would apply to (lets say) any mobile gear.

Didn't you ever play your synth at the beach ???   :^)

(anyway, most threads blow over pretty quickly, its no more OT than some
of the more esoteric "C" threads...)

H^) harry


----- Original Message -----
From: Graham Atkins <gatkins at blueyonder.co.uk>
To: Barry Klein <Barry.L.Klein at wdc.com>
Cc: xyzzy at sysabend.org, synth-diy at dropmix.xs4all.nl
Sent: Mon, 11 Apr 2011 18:23:06 -0400 (EDT)
Subject: Re: [sdiy] Transformer question ( skin effect )

If you don't mind me saying guys, this is a bit Radio Ham, a hobby I  
gave
up years ago due to boredom (The people not the gear.......)

Not very Synth DIY

Graham

On 11 Apr 2011, at 19:31, Barry Klein wrote:

> http://www.mfjenterprises.com/Product.php?productid=MFJ-4416B
>
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tom Arnold
> Sent: Monday, April 11, 2011 11:06 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Transformer question ( skin effect )
>
>> Some things I wonder about without checking into it...
>> Your problem is only a Transmit mode problem - you don't
>> need the boost during receive as it is a much lower power mode.
>> So noise developed for the boost is only during TX and probably
>> not much is sensitive to it then.
>
> Yes, in fact this board has an RF sense circuit, which is fine as  
> long as
> you have enough voltage to run the reciever, which drops out around  
> 11volts.
> Battery is rated down to 10.5 ( actually 10.1 I found ) so a lot of  
> life
> left that I can use otherwise.
>
>> You may just be able to utilize a large capacitance bank and
>> large guage wiring to get the boost you want compared to what
>> you are starting with.  Maybe look into cap banks used for these
>> outrageously loud car stereos.  All those design and implementation
>> techniques would apply to your problem/goal.  Pulling power out
>> of the bank may give you a lower source impedance source and
>> be a big help vs just a battery source.
>
> That would give me current, but I need the voltage to be Alternator  
> level
> and not Battery level. Only drawing 17amps or so on the one radio.   
> Just
> need to keep te voltage up to the efficient range for its outputs.   
> And I
> want to make sure it'll be okay if I forget to turn off my APRS rig  
> and it
> happens to transmit a beacon while I'm on HF.
>
>> Lastly, why in the heck do you need more than the ~100W a
>> typical XCVR has?  Are you bringing a linear out with you to
>> the beach??  Maybe just work on making a better antenna?
>
> This is my mobile rig. A mobile whip on 80m is not the most  
> efficient thing
> in the world so I'm trying to make the radio as happy as possible.
>
> -- 
> -----------------------------------------------------------------
> - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
> - SynthGeek        -  "...is it a virus, a drug, or a religion?"
> - AF6YW            -  Juanita Shrugs. "What's the difference?
> --------------------         -- Neal Stephenson,  Snow Crash
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-- 
Harry Bissell & Nora Abdullah 4eva