[VHFcontesting] [NEWSVHF] 222 Activity Night TODAY! Be there or be square!

[Fred Stefanik]

Let me clarify prices and shipping....single boards $75 plus $10 for
shipping.  Double boards $150 shipped.  I only want to ship to USA
addresses.
Thanks and 73
Fred
N1DPM

On Wed, Jun 23, 2021 at 3:28 PM Fred Stefanik <n1dpmfred at gmail.com> wrote:

> Well since Dave has difribulated activity on 222 and now there's growing
> interest I wanted to pass along a way to possibly increase your signal.
> I have a number of amplifier boards removed from VHF TV broadcast service.
> These were pulls from Thomcast / Thales transmitters.  These boards have a
> BLF278 as the active FET and easily make 250 to 300W for each FET.  They
> take about 4 to 5 watts to in for 300 out.  The boards have 2 independent
> amplifier circuits and FETs on each.  They are VERY EASY to put on 222 and
> a few more mods make them work on 2 meters.  These are just the boards with
> a FET....no heatsink, box, relays etc...  I can provide the documentation
> for either band.  I'm looking to get $75 per amplifier plus shipping. If
> you want a double board I'll sell those for $150 shipped to you as I
> don't have to cut them in half.  This is a working amplifier board with a
> tested FET for less than the cost of the FET itself.  Let me know if any of
> you are interested in any of these.  Maybe it'll help make 222 a noisier
> place to be!
> 73
> Fred
> N1DPM
>
> On Tue, Jun 22, 2021, 10:45 AM David Olean <k1whs at metrocast.net> wrote:
>
>> It is Tuesday and that means that there will be all sorts of activity on
>> 222 MHz. If you want to check out the latest update to your 222 setup,
>> tonight is THE night to check it out. KA2LIM in western New York will be
>> checking out some mods that he made, and I will be trying out version 3
>> of my high voltage power supply. Version 1.0 was just ugly and crude.
>> Version 2.0 was very pretty and used 12 X 2200 MFD 550 volt electrolytic
>> capacitors in a big capacitor bank.  After having a very robust arc
>> event that took out my HV fuse, I calculated the energy stored up in
>> those capacitors, and decided that I had gone overboard a little bit. I
>> mean 183 MFD at 5500 volts does seem a bit big!  1600 joules of energy
>> is not trivial.  I also had a failure of one of the 12 equalizing /
>> bleeder resistors, and that got me to thinking that using a bunch of low
>> voltage capacitors in a high voltage power supply was not a good idea.
>> Yeah, I know, everybody does it, but I felt more comfortable having a
>> single high voltage rated capacitor and a honkin' 200 watt wire wound
>> bleeder resistor.  Hence Version 3.0!  I now have a 30 MFD at 5 KV non
>> PCB capacitor installed along with an 80 Kohm 400 watt bleeder
>> arrangement all set for this evening on 222 MHz.
>>
>> Yes, I know that there are many areas of the country where activity is
>> rather sparse. All it takes is two stations to get on and make a
>> contact.  With the availability of chat pages now, it is a simple matter
>> to find someone at a suitable distance and try a difficult sked over an
>> un believable distance. You might surprise yourself.  I know that
>> Marshall, K5QE (Bless his soul) gets on for Tuesday night, and has no
>> local activity, so he tries to drum up a meteor scatter, EME, or tropo
>> scatter sked every Tuesday.  We need many more stations to be active in
>> out of the way places to try to extend our collective range. This is how
>> we can maximize our stations. Try something difficult! 900 miles is a
>> good meteor scatter distance. Tropo scatter can work out to 400-600
>> miles depending on your station and whether you can catch a tropo peak.
>> Last week, I managed to work KO4YC at 525 miles while running 80 watts
>> here. I don't know how Cornell managed to copy my flea power, but he did!
>>
>> I will be QRV at about 7 PM (2300 UT) on 222.1 or thereabouts. Try to
>> make an appearance and make a contact or two. It should be showery along
>> the East coast, so it is a good time to be inside and on the radio.
>>
>> Dave K1WHS
>>
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>