What's on your Workbench?

General discussion - When it doesn't fit anywhere else
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Re: What's on your Workbench?

Postby VK3YE » Sun Sep 09, 2018 12:27 pm

Variable inductor from corflute material - in this case used for a QRP antenna coupler

https://www.youtube.com/watch?v=NyKu0qKVA1I

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99 things you can do with Amateur Radio. Get involved in a new facet. 200 page Kindle ebook. $AU $5.99. Get yours at http://home.alphalink.com.au/~parkerp/99things.htm
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Re: What's on your Workbench?

Postby VE2OLM » Mon Sep 10, 2018 9:55 am

Building some 2.4 and 5.7 transverter from KUHNE ;-)
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Re: What's on your Workbench?

Postby VK1JA » Mon Sep 10, 2018 10:46 am

Work is slowly progressing with the 23cm LNA and 13cm transverter/lna projects.

The 23cm and 13cm lna's will be mounted in a carrier class enclosure. The 23cm lna is a G4DDK type with the 13cm lna being a minikits version. I've left space in the enclosure for either a pair of 2m/70cm lna's, or if I have space on the mast, a 9cm transverter - there're rumors that SG-Labs may be bringing out a 9cm transverter in the future!

The 13cm transverter project is based on the SG-Labs transverter, and will be run through a 30w pa from PyroJoseph (ebay seller), and all mounted in a 2RU rack case from Jaycar.

Both projects are waiting on parts to come in the mail - the mast mounted lna's just need two of the small 12v-24v buck boost boards (buying the locally means 5x the price) and the 13cm transverter is waiting on 2 DPDT realy boards to deal with the PA and LNA switching. All parts are on the slow boat from China so they might be here by mid October :( Does anyone have two of the 12v-24 buck boost modules they want to sell at a reasonable price? :(
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Re: What's on your Workbench?

Postby ZL3RC » Wed Sep 12, 2018 8:43 pm

This is a pic of the revamped ZL3TEN and ZL3SIX beacons.
Not on the work bench but it was while I was building it up.
Top down:
ZL3SIX exciter which consists of a Tait 162 TX section, cut out using a Dremel and a cutting wheel, modified to run on 50.040Mhz. It will generate about 45w flat out but is sitting at 25w to save power.
It was tuned for best power out efficiency which resulted in a figure of around 50% over all for the complete exciter.

ZL3TEN PA which is an old 27Mhz CB amp converted to class C capable of around 100w but currently running 25w

ZL3TEN Exciter which consists of a QRP-Labs TX kit to a small driver amp. This Exciter is very flexible in the modes it can generate and if you haven't looked at these as a beacon exciter I suggest you do as they are very cheap and you can even be GPS locked if you need too.

Two 12v SMPS 20A 1U high power supplies, only using one at present, side by side on one rack tray.

Power management panel with Voltage and current monitor on the left with a mains breaker and power meter, we have to pay for the power used, on the right.

The cabinet has a 230v temp controlled fan on the top and each PA has its own temp controlled cooling. The temp controlling of the cooling fans is to cut down on power consumption as left on 27/7 it just adds to the power bill unnecessarily.

ZL3TEN and ZL3SIX.jpg


Roger ZL3RC
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Re: What's on your Workbench?

Postby VK5ZD » Fri Sep 14, 2018 7:02 pm

Rebuilding my 122GHz transverter into a new enclosure.

IMG_20180914_182152.jpg
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Iain Crawford - VK5ZD
Munno Para West, SA - PF95ih
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Re: What's on your Workbench?

Postby VK2AAK » Wed Sep 19, 2018 11:35 am

Currently a mostly resurrected FT-726R. The unit is working but there is still some capacitor replacement to go as well as some final alignment. It's not bad though ... hearing the Dural (NSW) 2m beacon over a 235 Km path with just a 4 element yagi which is cut for the top of the band.
Also an IC-202 sitting on the bench waiting patiently. Again all working but waiting for an alignment.
FT726R.jpg
FT-726R current project
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Re: What's on your Workbench?

Postby VK3YE » Sun Sep 23, 2018 3:18 pm

Changing a quartz crystal's frequency with sandpaper



And attacking a ceramic resonator

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99 things you can do with Amateur Radio. Get involved in a new facet. 200 page Kindle ebook. $AU $5.99. Get yours at http://home.alphalink.com.au/~parkerp/99things.htm
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