What's on your Workbench?

General discussion - When it doesn't fit anywhere else
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VK7DR
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Re: What's on your Workbench?

Post by VK7DR » Sun Sep 29, 2013 2:47 pm

Was on the bench - finished now.
DSCF0129.JPG
DSCF0124.JPG
Rob (Robert G Heyward)

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VK4EA
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Re: What's on your Workbench?

Post by VK4EA » Sun Sep 29, 2013 6:18 pm

23cm FM ATV transmitter
ImageUploadedByTapatalk1380442671.336894.jpg

Cheers,
Peter
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Cheers,
Peter
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VK5TX
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Re: What's on your Workbench?

Post by VK5TX » Wed Oct 02, 2013 7:22 pm

Image

PCB ready my SOTA amplifier.

Ben

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Re: What's on your Workbench?

Post by VK3YE » Mon Oct 21, 2013 8:36 pm

As happens when space gets tight, some corners were cut and the rig became DSB rather than phasing SSB (the phasing module saved for a later project).



After some good contacts it was taken to the beach yesterday. Weather was sultry with a few spots of rain however BOM was not indicating thunderstorms. However mid-QSO the receiver suddenly stopped. I happened to be touching the rig and felt a tingle - unusual for a wire 20m long and 8m high.

The squid pole was hastily collapsed, the sky darkened, the wind whipped up, then the rain and a hundred dripping beachgoers clutching towels and eskies dashed up the steps as fast as if the bay had caught fire.

The value of a station that can be packed up in 5 minutes and a home that can be reached in ten proved itself, and after some brief probing the static blown BC548 RF preamp transistor was replaced.
-------------------------
Peter VK3YE http://www.vk3ye.com

NEW FOR 2019! Illustrated International Ham Radio Dictionary. 200 page Kindle ebook. $AU $5.99. Get yours at http://home.alphalink.com.au/~parkerp/dictionary.htm

VK4YMB
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Re: What's on your Workbench?

Post by VK4YMB » Tue Oct 22, 2013 10:48 pm

Just completed a 23cm DVB-S DATV - based on the BATC Digilite project.
IMAG0010.jpg
Cheers, Andrew VK4YMB

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Re: What's on your Workbench?

Post by VK3ALB » Wed Oct 23, 2013 5:15 pm

2.4GHz transverter with 30W PA from Pyrojoseph under the PCB.
13cm transverter.jpg
Lou - VK3ALB

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Re: What's on your Workbench?

Post by VK7JG » Wed Oct 23, 2013 5:51 pm

Hello Lou.

I hate neat work benches :-( .

I noticed that you are using a the small switch mode low voltage regulator .
I tried using one of these to supply 7.2 Volts for a supply to a GP300 portable that I used as a UHF ink to a 2M KL150 repeater .
Unfortunately when supplying the 1.5A load to the GP300 I experienced at least 3dB desense to the 2M repeater . The crud was coming from the switching regulator. Eventually I installed a three terminal 8Volt regulator and fitted a diode in series with the DC supply to drop the volts to around 7.4 Volts .

I possibly could have fixed the problem by shielding the unit , I also notice on the MIniKits web site there is an optional bypas cap fitted across the Variable resistor . You may not have a problem however it could cause you some grief as I experienced..

Regards.,
Joe
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VK3ALB
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Re: What's on your Workbench?

Post by VK3ALB » Wed Oct 23, 2013 6:09 pm

Hi Joe,

You weren't supposed to see the mess. :lol:

The 24V supply is only supplying the coax relay and some control stuff on the PA. I can't detect any noise in the RX if I cycle the power to the supply and I'll be testing the TX at the club on Friday night with Chas. You can bet if there's any noise I'll know about it.

Not sure what you mean about the bypass cap across the pot. Looking at the EME 166 page now and can't see any mention of it.
Lou - VK3ALB

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Re: What's on your Workbench?

Post by VK7JG » Wed Oct 23, 2013 7:17 pm

http://www.minikits.com.au/new-stock/LM2596-PSU-01

Hi Lou .
Have a look at the circuit C4 "option" this may have fixed my problem.

They are a great device . Unfortunately I have replaced mine.

73
Joe.

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Re: What's on your Workbench?

Post by VK4EA » Tue Oct 29, 2013 7:04 pm

uploadfromtaptalk1383037356087.jpg
Image

New BATC DTX1 digital ATV transmitter, nice pictures received.
Cheers,
Peter
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Re: What's on your Workbench?

Post by VK3YCQ » Thu Oct 31, 2013 6:40 pm

One end of a pair of do-it-yourself LFA yagis. OK, so it's not really a workbench but it will have to do.

Ian
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Re: What's on your Workbench?

Post by VK2ZRH » Sat Nov 02, 2013 2:36 pm

Rogers Beer_standup.jpg
Time to chill :)

73, Roger Harrison VK2ZRH

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Re: What's on your Workbench?

Post by VK4REX » Sat Nov 02, 2013 4:57 pm

Finally finished the transverter controller. This allows me to switch between my 7 transverters plus an external unit which will be a HF amplifier, 6 and 2 meter amplifier all controlled by the FT817 band data and the band select switch on the controller.
The LCD display shows the IF frequency used, the RF frequency (1296 to 47Ghz), and monitors the voltage, current drawn and displays the relative RF out for each of the transverters (the RF out data is scaled for each transverter in software). Also displays the GPS data for the location in addition to supplying the 1PPS data for the frequency disciplined reference oscillator. Been a lot of work but a lot of fun being able to switch between 7 bands in seconds.

This hobby has many facets and lots of fun to be had.

Rex
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Tvtr controller 5.jpg
Tvtr controller 6.jpg
Tvtr controller Rx 3.jpg
Tvtr controller Tx 4.jpg

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Re: What's on your Workbench?

Post by VK2ZRH » Sat Nov 02, 2013 5:15 pm

Wow, Rex. THAT is truly awesome!

73, Roger Harrison VK2ZRH

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Re: What's on your Workbench?

Post by VK4REX » Sat Nov 02, 2013 5:46 pm

Thanks Hairy

Reminds me of our old days of 6 Up magazine -- it's the same old Rex

Rex

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Re: What's on your Workbench?

Post by VK2ZRH » Sun Nov 03, 2013 5:30 am

Ah, yes, Rex. But nostalgia ain't what it used to be :mrgreen:

73, Roger Harrison VK2ZRH

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Re: What's on your Workbench?

Post by VK2OMD » Sun Nov 03, 2013 6:47 am

VK4REX wrote:Thanks Hairy
...
Or was it HA1RY... exotic DX!

Owen

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Re: What's on your Workbench?

Post by VK4REX » Sun Nov 03, 2013 7:26 am

Nothing exotic bout Roger !!!!!

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Re: What's on your Workbench?

Post by VK3ALB » Wed Nov 06, 2013 11:10 am

What do I have on my workbench? A dodgy coax relay :(

On the recent VK5/VK3 activity day the relay in my 2.4GHz transverter failed. Luckily the circulator in the PA saved me from further dispair. The 28V relay seemed to work fine on the bench at 24V and many power cycles showed the contacts were OK yet in the field the relay failed to close on TX.

What went wrong?

The relay seemed to have something wrong with the coil but I haven't been able to prove exactly what it is. The supply voltage is very critical and at anything under 24V the contact closure becomes intermittent. After being energized for 5 minutes the relay becomes very hot to the touch. At that point regadless of the supply voltage the contacts will not close correctly until the relay has cooled down. I suspect that the relay heated up sitting in the sun all afternoon and on the first TX it just failed to close.

I pulled a new Transco 28V relay out of the drawers and tested it the same way. Very little temperature rise after 15 minutes and reliable contact closure down to 15V.

A bargain purchase may not always be what it seems.
18G relay.PNG
Lou - VK3ALB

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Re: What's on your Workbench?

Post by VK2OMD » Wed Nov 06, 2013 12:23 pm

VK3ALB wrote:What do I have on my workbench? A dodgy coax relay :(
Lou, are you quite sure that it is not a pulse latching relay?

Owen

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