Hello everybody

So here you have it. Kari, oh2gqc, has finally gone cyber…

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80-Meter Magnetic Loop Antenna

No rain today so I finally managed to raise my 80 meter mg-loop  to an upright position.

Loop

80 meter loop

  • Circumfence 8 meters
  • Diameter about 2,5 meters
  • Tube diameter 30 mm
  • Faraday type feed loop made out of coax cable
  • Vacuum variable capacitor  ~ 10 – 350 pF

The performance of this loop remains to be seen as today the 80m band seems to be pretty much dead.

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Cushcraft R7 vertical back in service

This is my good old Cushcraft R7 vertical. I got this second hand some 10 years ago. It has now been unused for a couple of years until this spring I decided to give it a go agein.

Cushcraft R7 on my back yard

Unfortunately it turned out that there was no match on any band.  Only one reconance point was found and even that was well above the 7 MHz band.

Now what?

After spending some time Googling I decided to open the mathing unit to see if there was a problem there.

Control box’

No obviouus problem was found. It is evident that the provious owner had used way too much power as the balun toroid ( the one on the left ) had run very very hot at some time. The circuit board  was brown under the toroid, the cable tie holding the toroid in place was melted and even the plastic box was somewhat bent.  All the connectors had some corrosion in them as well.

I took the circuit board out, resoldered all solder joints and cleanded the connectors.

This helped and now there is a nice dip on every band except on 28 MHz.

During testing I managed to contact Japan on 20 meters using JT9 and 20W output so the good old R7 is still going strong.

28MHz still not working but nobody’s there anyway so it is not that bad.

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KPA100 Assembly

Some resistors and RF chokes in place

Most capacitors, relays and resistors installed.

Voltage checks; all values nominal.

Almost all components installed.

All components installed

Final adjustments and checks. Everything FB.

Testing serial communication

CAT control via RS232 works fine with ‘real’ serial cable. Does not work with ‘brand QWERTY’ USB to serial adapter.

Ready to go.

With this new converter CAT works just fine.

New USB to RS232 converter

This completes the PA100 assembly and test.

Now off to work some DX…

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KPA100 Part inventory completed

All the required parts are included as is common with Elecraft  kits.

They’re all there.

Most parts I have put into small bags by component values. Having parts sorted out this way makes assembly easier. If I run out of some capacitor value for example, then I know that I’ve made an error earlier and can go back and fix it.  Of course it is better to follow the ‘measure twice, cut once’ prinicple but mistakes can ( and will ) happen.

 

 

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New Ham project

While age I ordered the KPA100 PA -kit for my Elecraft K2. I never got around to building it until now when I want to computer control the K2.  KPA100 kit also includes the KIO2 feature which enabes computer control with RS232 cable ( remember RS232 ? ).

So, the build project has now started. It will probably take a long time to finish the build but then again I’m in no hurry.

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My new pride and [j|t]oy

Here it is, my new toy, the Icom IC-7300 HF transceiver.

This is a very nice rig indeed. I’m not going to repeat all the feratures it has as many reviews of this baby can be found on the Internet and in ham magazines.

IC-7300 is the same size as IC-730 of yesteryear.

It is amazing how much features can today be crammed into a small package. This is all thanks to advances in digital technologies.
The IC-7300 is actually a dedicated computer but the ‘look and feel’ is just like that of an analog radio.

Way to go, Icom!

Can’t wait until they come out with the new IC-7610 …

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Fitting a round peg into a round hole

How hard can it be?

Well, the reflex-tube’s diameter is larger than it’s hole in the cabinet.

Reflex-tube

It’ won’t fit, Beavis!

So some filing…

file

First use file…

…and sandpapering ( is that a word ? ) …

sandpaper

…then apply sandpaper…

…was required for a snug fit.

..and it's done!

…and it’s done!

Next up: Putting it all together.

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Spiders have multiplied!

Today I have been productive. All four filters are now glued and soldered together.

Four filters

Four filters

Each filter was tested as well:

Filter under test

Filter under test

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Ugly spider

The crossover filter now looks much like some gastly mutated spider.

All these wires are required because of the mid- and higrange control switches.

Crossover filter

I really should have designed a prited circuit board for the filter…

Ugly as ig may seem, it does work however.

Here’s a clip taken when testing the filter.

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The Crossover Filter

Here is the first crossover filter assembled on a piece of cardboard with ample amount of hotglue.

Crossover filter

Crossover filter

Initial test of filter usign a 1,5 volt battery as signal source.

Filter under test

Filter under test

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