[NLRS] Power on 5760 MHz

[Ray Johnson]

John

I have to apologize about the 5760 power amp effort

Doug, N0NAS, provided me with one of the many NorTel 6 GHz power amps to 
measure and modify for 5760 as a potential 10 Watt solution. I did some 
early measurements on the stock design and was able to easily get 4 
Watts CW. The original design was for continuous duty operation with 
very low distortion at the +32 dBm power level -- It is capable of much, 
much more.......

Gary (LJC) provided data sheets on the FETs used and it appears that 
something like 10-15 Watts should be no  problem--The key issue will be 
what your end usage will be which will determine how much of the 
original heat sinking should be kept for reliable operation. I intend to 
just use the inner assembly for lightweight roving applications..

I got called up to work full time  so I haven't had an opportunity to 
complete these measurements--If you can wait till after the holidays, I 
should have full RF, DC and temperature data for these amps. They sure 
are nicely built and look to be an excellent solution for any mainstream 
5760 application...I think that Doug has a reasonable supply of these 
amps  for sale... I think he also has the classic Avantek Telcom amps 
for sale too.

Stay tuned for more info..

Ray Johnson  WB0EBG




tosca005 at umn.edu wrote:
> My 5760 transverter is an older 10 mW Down East Microwave model. I have a 
> few options for boosting the power up to a more competitive level, but 
> while browsing the listings on eBay, I came across a few items that looked 
> appealing to me and might interest other folks in the same boat as I:
>
> Item 400182916307, a pair of PC boards for a RFMD/Sirenza 4.9-5.9GHz 1Watt 
> SZA-5044Z RF MMIC Power Amplifier in 4mmx4mm QFN Package -- $11.99 for the 
> pair, has "more than 10 available", has sold 110 of them so far.
>
> Item 260605336283, a package of 5 of the MMIC chips that fit on the above 
> boards -- $13.99 for the set of 5, 3 sets available, 5 sold so far.
>
> These would provide about 22 dbm maximum output power at 5760 MHz, so a 
> noticeable bump from 10 mW (10 dbm), but still pretty low. So why bother? 
> Because the next item below needs 18 dbm in to produce a pretty healthy 5 
> watts or 37 dbm of output power.
>
> Buy 5 of the board sets and 2 of the MMIC sets and you could build 10 
> boards... Strange choice of grouping the sales if you ask me. And of 
> course, you would need to add the various chip caps, chip resistors, chip 
> inductor, and SMA in and out connectors, and be comfortable with surface 
> mount components (which I'm not). But could be a group project if a number 
> of people wanted assembled boards and someone in the group wanted to tackle 
> it for those of us less adept at assembling microwave components...
>
> Then, I also saw the following item that would nicely complement the above 
> pre-driver boards to bring them up to a genuine 5 watt level:
>
> Item 250983172827, a 4.8-6.7 GHz 5W Power Amplifier M/A-com MAAPGM0060 -- 
> from the spec sheets, it appears that 18 dbm in would give the 37 dbm (5 
> watt) output that the part is capable of generating, and since the prior 
> item could provide up to 22 dbm, it seems that 5 watts from 10 mW is 
> doable. Unfortunately this last item is selling for $120, whereas the prior 
> ones are priced low enough to entice me to experiment. As far as I can 
> tell, this item is just the module itself, so a board would need to be 
> created to use it.
>
> Anyone want to offer comments on these items? Or is everyone else already 
> at power levels above a watt or 5 on this band?
>
> 73 de W0JT/5
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