[hpsdr] PS results on 6M with LDMOS

[Mike Seguin]

Tnx Helmut. I did mistype the NXP part #. I used a BLF178, not 177....

Mike

On 2/7/2014 1:21 PM, Helmut, DC6NY wrote:
> Fine job Mike, congrats!
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: hpsdr-bounces at lists.openhpsdr.org
> [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Mike Seguin
> Gesendet: Freitag, 7. Februar 2014 18:43
> An: apache-labs at yahoogroups.com; hpsdr at lists.openhpsdr.org
> Betreff: [hpsdr] PS results on 6M with LDMOS
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Howdy all,
>
> I'd like to report on a few tests here on 6M using Pure Signal and a HB
> LDMOS amp.
>
> My test setup is a bare Hermes board in an ANAN-10 case. On 6M, the Hermes
> output is 250 mW. My first test was closed loop with just the Hermes to
> verify everything was operating as expected. Firmware is 2.5 and Software is
> mRX 3.28 PS.
>
> The LDMOS Amp uses an NXP BLF-177. It is good for a kW+ on 6M. It has
> serious gain. In my tests, 1/2 watt in gives 300 watts out. That is the
> level where I ran the tests.
>
> This screen shot is the bare Hermes setup looped back to itself with the
> sample set at 1 dB below ADC overload. All subsequent measurements were also
> set at the same 1 dB below ADC overload. (watch any wrap of the following
> URL's)
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/Herme
> s1.PNG
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/Herme
> s.JPG
>
> Screen shot of the bare Hermes with PS active is here:
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/Herme
> s2.PNG
>
> Next is a shot of the LDMOS amp @ 300 watts without PS
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/LDMOS
> _300W.PNG
>
> Next is the amp with PS active
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/LDMOS
> _300W_PS.PNG
>
> Here are a couple of shots of the AMP setup on the bench. I used a Bird
> sniffer on the output of my wattmeter to feed back to the Hermes.
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/LDMOS
> 1.JPG
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/LDMOS
> 2.JPG
>
> The next step is to insert a 10 dB Class A driver I have to boost the Hermes
> to fully drive the LDMOS amp. Hope to have some screen captures of that
> soon. I first need to characterize it with the Hermes. This is the driver:
>
> http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/drive
> r.JPG
>
> Tnx to all involved in rolling out PS!
>
> Mike
>

-- 

73,
Mike, N1JEZ
"A closed mouth gathers no feet"


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