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70 MHz amplifier

70 MHz PA Project

 

A while ago, I received by mail, a 4 meter PA kit, which I am going to assemble when time and health permits.

I got it from www.dutchrfshop.nl, and the price was right for my wallet, ~60 Euro including tax.

Actually, I'm quite excited about this, as it's the first time I'm playing with a relatively expensive MOS-fet, an SD2931-10. Let's hope the blue smoke is kept secure inside. :o)

Below are the Pcb's, very nice one's, goldplated and beautiful.

One for the PA, and another for the low pass filter.

 

Things are moving forward now ...

 

Så skal der bygges 4 meter pa-trin. :o)

Jeg faldt tilfældigvis over en Hollandsk hjemmeside, www.dutchrfshop.nl, som havde en del spændende, og jeg faldt for dette sæt.

~60 Euro incl. tax, (vi kalder det moms), så får man et sæt inclusive lavpasfilter. Mosfet'en er brugt, men garanteres i orden, og der skulle kunne opnås 150 Watt med den.

Printene er MEGET lækre, med gennemplettering i guld, som virker rigtig gennemtænkt.

Selvfølgelig må vi ikke køre mere end 25 Watt, men jeg skruer nok ned for exciteren. ;-)

Mere følger, når jeg får tid og energi til at kaste mig over det.

 

2-3-2015.

 

Lidt er der da sket, det går langsomt, men sikkert.

Jeg havde en lækker køleplade liggende imellem mine godt og vel 100Kg i kælderen. Jeg skyder den til 0,6K/W, baseret på en med samme profil, halv længde.

Nu venter jeg bare på den 48V Psu, som er på vej fra Kina, det ta'r den tid det ta'r. :o)

Der skulle osse lige bores et par huller, og skæres 3mm gevind.

 

Well, I had some energy left, så I decided to heat up the soldering iron.

I have a LOT of heatsinks in the basement, and this one is guaranteed to keep the fet cool.

Based on a similar profile, I estimate this to be aprox. 0.6 K/W.

I'm waiting for a 48V Psu from China, I guess it takes a few weeks more. Patience is needed when you buy from China, but things are cheap, and that's important. :o)

In the meantime, I drilled some holes, and cut threads. (3mm)

23-03-2015.

The PSU is in my hands now, but energy is failing, I haven't got any further, but "one of these days" :o)

 

Life is truly strange....

 

When I was young, I was a dreamer.

Now i need pills to sleep.

 

Borrowed from Storm P.

Så kom PSU'en, men min energi er lig nul, så det får vente med fortsættelsen.