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 VK5TM » Wed Mar 09, 2016 9:47 pm

DSCF0777.JPG


These appeared from somebody's cold dark storeroom a few days ago and landed on my bench.

Top one is a Philips School Radio/Pa system.

The bottom one, not sure, but possibly a pre-1960's Bland Radio PA/Radio/Gram unit.

Once the weather cools down some, I'll check them over to see what condition they are in electrically.
Expecting to have to replace a load of caps and resistors before they can be powered up.
Sent from my PC using my fingers.
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Re: What's on your Workbench?

Postby VK4UH » Sun Mar 13, 2016 8:06 am



First "turn" of the 1.2m Mesh dish for 23cms EME at VK4UH
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Re: What's on your Workbench?

Postby VK2ZRH » Sun Mar 13, 2016 10:11 am

Nice kit, KJ. :)

What's the tilt drive you have there ?
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Re: What's on your Workbench?

Postby VK4KHZ » Sun Mar 13, 2016 11:41 am

Great stuff Kevin - It looks fantastic!
I would love to have the space for a dish of that size for ISS HAMTV use. What are you using to drive and control the dish please?

Regards

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Re: What's on your Workbench?

Postby VK4UH » Sun Mar 13, 2016 2:22 pm

Hi all

The dish system above is based around a Yaesu G-5600B Azimuth-Elevation rotator combo and a custom/home built mounting ring to interface to the dish "rose" and with
a movable counter weight arm to balance the forward roll of the dish when the septum feed and mounting arms are attached.

The control box has provision for RS232 external control which eventually will allow for automatic tracking.

I intend to build a circular polarised septum feed for EME and an interchangeable "bowtie" linear feed for terrestrial use.

I'll post more info as I progress

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Re: What's on your Workbench?

Postby VK4KHZ » Sun Mar 20, 2016 8:09 pm

My portable ISS HAMTV receive system is now completed. The system comprises 1.6m solid petal dish, 2.3 - 2.4 Ghz helix feed, down converter, yaesu G-5500 rotator and all steered with SatPc32 software and LVB tracker.

The small custom built tower section is on wheels (which lock) to make it easy to move around. The entire system disassembles in less than 10 minutes and it takes around the same amount of time to reassemble making it ideal for on-site school demonstrations.

In hindsight the G5500 rotator was not the best choice for this work but it is OK. I have three G5500's and all of them behave differently however with some patience when calibrating they are now all are within +/- 3 degrees which is right on the limit for HAMTV work.



https://www.youtube.com/watch?v=lwKrLAx ... e=youtu.be
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Re: What's on your Workbench?

Postby VK1JA » Sun Mar 20, 2016 9:06 pm

Very nice setup, impressive that it can be setup and packed up so fast.

I'm wondering what your method is to get the best accuracy out of the G5500, is there a nack to the calibration other than what is listed in the manual - any way to take up a bit of the slack in the gears etc?

Have you thought about using the setup for eme?
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Re: What's on your Workbench?

Postby VK4KHZ » Mon Mar 21, 2016 6:06 pm

I have found that a perfectly balanced counterweight plays a big part in significantly reducing the backlash/slop in the G5500.
I have SatPC32 set to track at 1 degree increments and the amount of "slop" between the gears seems to be reduced once the counterweight is properly balanced. The calibration of the tracking interface is the bit I found the most frustrating (in my case an LVB Tacker kit distributed by Amsat) to get it and the G5500 perfectly calibrated, but with perseverance it is achievable.

I have not considered using this system for EME however that may well be a possibility.

The entire unit fits neatly in the rear of my Hilux and is relatively light weight.

Regards

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Re: What's on your Workbench?

Postby VK3PF » Wed Mar 23, 2016 5:06 pm

Hi all,

A new addition to the workbench. Picked up this afternoon and now listening to 40 m SSB. Hearing VK9CK on 15 m CW well earlier.
It is here for a couple weeks to prepare a review. I understand that the first shipment to arrive was a total of 10 units only.

IC7300s.jpg


Impressed so far - very easy to navigate. Sorry about the poor light in the image.

Cheers,

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Re: What's on your Workbench?

Postby VK5TX » Fri Mar 25, 2016 4:50 pm

Playing around with a VFO for my next ssb build. About 4MHz to low at the moment Image
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Re: What's on your Workbench?

Postby VK4REX » Mon Mar 28, 2016 12:35 pm

With the shift down in frequency on 3.4Ghz, I retuned the filter in my 3.4G transverter so that I could cover 3.395 thru to 3.405.
It's a lot sharper than printed filters at around 30Mhz wide at the 3dB points and only 3.2dB insertion loss. As it was I would have been losing power at 3.395Mhz.

3.4Ghz filter retuned.jpg


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Re: What's on your Workbench?

Postby VK3YE » Wed Mar 30, 2016 5:19 am

Build an audible VHF/UHF FM handheld transmitter tester in 10 min. Uses just 3 parts.

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Re: What's on your Workbench?

Postby VK3ZAZ » Wed Mar 30, 2016 10:27 am

Old CH5A vision coupler about to experiment with dual 2M 160W amps to learn about combiners and how efficient they are.

Dual HN in
Flange out
rated at 2x360 watts in and 750 peak vision out to the old 5A PA tube.
Image

Sweeps well at 144 mhz.
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$100 counter

Postby VK3ZAZ » Wed Mar 30, 2016 10:47 am

01-2.7 gHz
Timebase Frequency: 13MHz
OCXO
Short-term Stability: ±3×10-9 /S
Long-term Stability: ±2×10-9 /month
Temperature Coefficient: ±1×10-7 , 0℃ ~ 40℃


specs from here
http://toolboom.com/nfs/product/818791/file/Atten_F1000_F2700_User_Manual.pdf

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Good bad indifferent? :popcorn:
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Re: $100 counter

Postby VK3ALB » Thu Mar 31, 2016 8:23 am

VK3ZAZ wrote:01-2.7 gHz
Timebase Frequency: 13MHz
OCXO
Short-term Stability: ±3×10-9 /S
Long-term Stability: ±2×10-9 /month
Temperature Coefficient: ±1×10-7 , 0℃ ~ 40℃

Good bad indifferent? :popcorn:


Maybe.

If you're interested in precision measurements you won't be able to easily connect this to a GPS reference which is normally 10MHz. That may not be a problem if the OCXO is set to 13MHz. Yes you could trim the OCXO if it's out but some of these meters have the OCXO between the from panel and the main PCB so you can't easily get to the adjustment. After all of that you've identified that it is a $100 counter so you know not to expect lab quality performance.
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Re: What's on your Workbench?

Postby VK4JAM » Thu Mar 31, 2016 9:51 am

This looks similar (with the same specifications) to the frequency counter that I have been using for a few years, and I paid a similar amount of $$$ for it off e-bay.

I have found it a good piece of kit for general amateur use. The stability of my unit is good and within specification - I referenced this against a rubidium standard to check this.

I agree with Lou, you get what you pay for. There are better "lab quality performance" counters out there, but they cost a lot more.
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Re: What's on your Workbench?

Postby VK5LTD » Sat Apr 02, 2016 8:18 pm

Two little projects completed today- made Heil headset adapters for TS-830S & Uniden 2020. so actually off my workbench and in my shack - + working
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Re: What's on your Workbench?

Postby VK3NFI » Tue Apr 12, 2016 10:43 pm

Got tired of the rats nest coax not knowing what was what.......

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73's
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Re: What's on your Workbench?

Postby VK3JUG » Fri Apr 15, 2016 8:15 am

Very nice just the thing to keep my OCD happy. Have you thought of marketing them to others i sure like me others will want them now.
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Re: What's on your Workbench?

Postby VK3YE » Sat Apr 30, 2016 2:26 pm

Not my workbench but a great EEVblog video on a 105 year old radio builder in Sydney.

https://www.youtube.com/watch?v=4cU7zCx_liM

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