[Amps] 4z4rb amps

Bill Turner dezrat at outlook.com
Wed Jul 2 19:00:09 EDT 2014

Thank you, Baruch. Just what I wanted to know.  I might suggest that you 
include much of this information in your ads. I'm sure it would help sales.

73, Bill W6WRT
dezrat at outlook.com

------------ ORIGINAL MESSAGE ------------On 7/2/2014 1:27 PM, Baruch 
Zilbershatz 4z4rb wrote:
> Hello Sir!
> Amps are made for 160-6m
> Slight trade off to et the right balance in power/bandwidth so there is
> about 10% drop on 6
> As for duty cycle
> If the boards are mounted as needed on a proper heat sink with a good sized
> copper heat spreader with 10mm thick and air is directed on fins as well on
> top of board to cool the magnetic
> I was able to run the amps for a long

>   time
> Cores are large and many thus an average rise of core temperature is also
> controlled
> As a result I have not seen core failure or saturation and far away from
> curie point
> Also the use of many cores gives better IMD and far better results than
> using A single very large tube or core
> Also as seen in ON9CVD study on Magnetics
> I also tested the 2kw board with 2x blf188XRS  on a full copper heat sink
> with clamping the devices and not just using 4-40 screws at the tabs
> Results are very good and when ran at 1600w out F2 and F3 were way down and
> very known 10-11 MHz distortion of LDMOS was down too
> Hope this clears a bit the subject
> Thanks
> Baruch 4z4rb
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Bill Turner
> Sent: Wednesday, July 02, 2014 11:04 PM
> To: amps at contesting.com
> Subject: Re: [Amps] 4z4rb amps
> ORIGINAL MESSAGE:          (may be snipped)
> On 7/2/2014 11:37 AM, Baruch Zilbershatz 4z4rb wrote:
>> All my amps are LINEAR
>> Class AB
>> Seems to be much confusion
>> Current readings are Avg
>> And not class C
>> Bias is set for class ab and is tracking thermally and regulated Thanks
> and
>> 73's
> Thank you, Baruch. May I ask two questions?  What is the bandwidth of
> your amps?  160-6 meters? And what is the duty cycle? I realize duty
> cycle depends on cooling, but assume very good cooling, what duty cycle
> for full power?
> Thank you,
> 73, Bill W6WRT
> dezrat at outlook.com
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