So here you have it. Kari, oh2gqc, has finally gone cyber…
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.
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.
After spending some time Googling I decided to open the mathing unit to see if there was a problem there.
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.
CAT control via RS232 works fine with ‘real’ serial cable. Does not work with ‘brand QWERTY’ USB to serial adapter.
With this new converter CAT works just fine.
This completes the PA100 assembly and test.
Now off to work some DX…
All the required parts are included as is common with Elecraft kits.
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.
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.
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.
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 …
How hard can it be?
Well, the reflex-tube’s diameter is larger than it’s hole in the cabinet.
So some filing…
…and sandpapering ( is that a word ? ) …
…was required for a snug fit.
Next up: Putting it all together.
Today I have been productive. All four filters are now glued and soldered together.
Each filter was tested as well:
The crossover filter now looks much like some gastly mutated spider.
All these wires are required because of the mid- and higrange control switches.
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.
Here is the first crossover filter assembled on a piece of cardboard with ample amount of hotglue.
Initial test of filter usign a 1,5 volt battery as signal source.
Now this is the difficult part. How to drill holes straight and properly centered?
Trying to accompish this with this weird looking rig. ( Handcraft is definetly not where I excel … )