[VHFcontesting] Re: Powering microwave amps from portable supplies

[gmills at frontiernet.net]

In a related question: 

What RF level are people driving the Avantek PA's with to get the rated 
output? 

Thank you, 

Greg - K2LDT 


PS - I disabled the onboard power supply, and run it with a -12 V and +10.5 
V switchers. 


kr7o at vhfdx.com writes: 

> I am looking at incorporating a 10w Avantek 5.7G and one of the 3.4G 
> Toshiba amps into my portable microwave station and I am curious as to 
> what other people are using for regulated supplies for the odd and in some 
> cases fairly critical voltages needed to power these amps.  In the case of 
> the Avantek, I am talking about the modified units requiring +10.5v and 
> -12v, and of course the 12.6v for the Toshiba amps. 
> 
> For portable operations I typically use two 12v deep cycle batteries that 
> will range in voltage between 11.5v and 13v over the course of the 
> discharge cycle.  -12v shouldn't be a problem, but I haven't found zeners 
> or other voltage regulators of the proper voltage and current ratings for 
> the other voltages.  12.6v is even more of a challenge without some sort 
> of DC-DC converter (but again I haven't found any surplus converters that 
> match the needed conditions). 
> 
> I could always build an AC power supply for the proper voltages, but then 
> I need to carry a potentially noisy inverter (and the overhead necessary 
> to power that).   Resistive voltage dividers are a possibility, but still 
> do not provide the level of regulation that appears to be needed to 
> protect these devices, and also waste precious battery stores. 
> 
> So, what is everyone using to supply these amps.  Hopefully I am missing 
> something simple here. 
> 
>  
> 
> 
> 73, Robert KR7O/YB2ARO, DM07ba/OI52ee  (ex.  N7STU)
> kr7o at vhfdx.com 
> 
> www.vhfdx.com (Norcal WSWSS activities & KR7O/YB2ARO homepages) 
> 
>  
> 
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