[hpsdr] Penny: power shortfall

[Chris Smith]

Frank

I've had a look at the CCI AN779L kit but it looks horribly complex  
for a driver stage. http://www.communication-concepts.com/an779L.htm

I prefer the look of the K5OOR SDR 5W Amp kit as it's less complex  
(and costly). http://www.hfprojectsyahoo.com/sla5wamp.html

Phil Harman reminded me of an article he published in RadCom last July  
with a driver stage which would fit the bill. Unfortunately there  
doesn't appear to be a PCB for it and I'm not a fan of 'dead bug'  
construction.

I am inclined to curb my impatience and wait for the Pennywhistle kit  
assuming it will materialise in the same time-frame as Alex. In this  
way the whole shooting match will be HPSDR.

The AN762-140 amp driven with 500mW should produce around 14W  
(assuming the claimed power gain of 14dB) which should get me a few  
contacts while I wait for the 'real thing'.

All I need is some decent weather and a little assistance to get my  
multi-band vertical installed and I can start making some on-air tests.

Thanks to everyone who responded to my query.

73
Chris G4NUX

On 13 Jan 2009, at 12:45, Frank Brickle wrote:

> Chris --
>
> If you do go ahead with that, please let me know. I'm putting  
> together a DC-to-daylight rig based on the USRP and am prepared to  
> confront the power gap on the HF TX side now :-)
>
> 73
> Frank
> AB2KT
>
>
> On Tue, Jan 13, 2009 at 7:30 AM, Chris Smith <chris at vspl.co.uk> wrote:
> Hi Frank
>
> Many thanks for that. The amplifier I have is that based on  
> Motorola's AN762 with a pair of MRF454s. The kit came from  
> Communications Concepts!
>
> Cheers & 73
>
> Chris G4NUX
>
>
> On 13 Jan 2009, at 12:21, Frank Brickle wrote:
>
>> Chris  --
>>
>> I'd been wondering approximately the same thing, and was reminded of
>> <http://www.communication-concepts.com/hf_amplifiers.htm>
>> especially the AN779L.
>>
>> 73
>> Frank
>> AB2KT
>>
>>
>> On Tue, Jan 13, 2009 at 7:01 AM, Chris Smith <chris at vspl.co.uk>  
>> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Guys
>>
>> I know this a bit off topic but I would appreciate your help.
>>
>> Penny, as an exciter, produces 0.5W. I have an amplifier which will  
>> produce 100W if driven with approx 10W. Does anyone have a simple  
>> circuit for an amplifier which will produce approx 10W from 0.5W  
>> drive?
>>
>> I suggest you contact me directly rather than clutter the  
>> reflector. :-)
>>
>> Thanks
>>
>> 73
>> Chris G4NUX
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>>
>>
>> -- 
>> Designing software that works on the assumption that everyone will  
>> have your client is like designing a society on the assumption that  
>> everyone will just be honest. -- Paul Graham
>
>
>
>
> -- 
> Designing software that works on the assumption that everyone will  
> have your client is like designing a society on the assumption that  
> everyone will just be honest. -- Paul Graham

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