[hpsdr] Automatic Tuner Unit

[Glenn Thomas]

Interesting wrinkle. Note that the Z-100 (not Z-100Plus) has no such 
limitation in its spec, though it may share the limitation in reality.

Presumably the power limitation for PSK is based on thermal performance 
- the toroidal cores get too hot. If so, perhaps you need a higher power 
tuner. Check out LDG, MFJ, SGC or Tokyo Hy-Power. For example the LDG 
AT-200ProII is rated at 250 watts for most modes, 75 watts for 
PSK/digital. http://www.ldgelectronics.com/c/252/products/17/3/2.

A thermal problem doesn't say very good things about tuner efficiency. 
Perhaps, instead of a higher power ATU, a tuner with air core coils is 
called for. This seems likely to be physically bigger than a comparable 
ATU with toroidal inductors.

73 de Glenn

On 9/14/2012 8:58 PM, Aivars Straupe wrote:
> ***** High Performance Software  Defined Radio Discussion List *****
 >
 > Look here Glenn: http://www.eham.net/reviews/detail/8234 Review with
 > two stars. Yes, other hams say it is OK, but if I'd like to use PSK
 > :-( Not in contests, at least time by time...
 >
 > OK anyway, I don't drop idea about manufactured ATU at all. Are there
 > any cheap and strong atu on market?
 >
 > 73!!!
 > Aivars.





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