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ON3VNA's Ham Shack - Johan Pollet

Johan Pollet
Technician Class
Ham Since 2009

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My Ham Radio Interests
All Digital modes.
Software defined Radio.

DJ-596 VHF-UHF Portable transceiver.
RTL-SDR : DVB-T stick based SDR receivers.

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ON3VNA Updated Profile - 4/15/2018 5:59:29 AM

ON3VNA's Blog Post - 3/22/2014 8:38:41 AM

Automatic Rotor with MMC2120MG chip

Shame on me, finally after 4 years on the desk. It's alive the compass.

It is connected to an Arduino that interfaces with HRD-Rotator and simulates an Idiom Press rotor.

Next step is the motor controller part but for that i need some connectors that i don't have so must go shopping first.

Hopefully it will not take 4 years this time HI.

73 de ON3VNA
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ON3VNA's Blog Post - 11/13/2012 7:09:39 AM

HF convertor arrived for the RTL-SDR "El Cheapo"

Last night the HF convertor arrived for the RTL-SDR devices. It can also be used for funcube.
Will post some pictures later on after some testing.

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ON3VNA's Blog Post - 10/28/2012 2:06:39 AM

30m Digi modes

Yesterday was fun, was able to run some digi modes that are seldom used. It requires some skill to differentiate all the modes by the view on the waterfall and the sound of it.
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ON3VNA's Blog Post - 10/24/2012 3:34:11 AM

Back in service

After a year of all kind of troubles we are back in the air.

Also made a clean up off the shack, was needed HI.
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ON3VNA is Connected to the following - 11/7/2010 9:07:46 AM

ON3VNA's Blog Post - 11/7/2010 9:07:46 AM

DS1085 is finally working with ATMega16

Today got it finally doing what it had to do, generating frequency as was requested.

This opens new area's:

- Home brew antenna analyzer.
- Hoe brew SDR receiver based on the DS1085.

This calls for a celebration, with a cool drink, let's call it a beer.

73 de ON3VNA
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ON3VNA's Blog Post - 7/4/2010 4:58:57 AM

Automatic Rotor with MMC2120MG chip

After Murphy 's hit on my digital compass some brainstorming was done. I have a 125 € rotor with 3 wires old fashion HI, but we could make it new fashion with with the usage of the compass chip.

Let's add a keyboard for entering the bearing , add an ATMega16 as controller with RS-232 interface to the rotor controller program of HRD (Ham Radio Deluxe), add a rotary encoder for those who prefer to turn knobs i.s.o. using the keypad add a 6 digit 7- segment display (Recovery from a never finished project from elektor) showing the current bearing and the bearing where to go to.

Basic diagram has been drawn, now to find time to make it in detail.

Let's first check if we can get the communication up and running between the ATMega16 and the MMC2120MG chip, because the data sheets of this chip are very mystic.
If we can get this working we can continue with the other parts of the automatic rotor.

To be continued.
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ON3VNA is Connected to the following - 6/21/2010 11:08:13 PM

ON3VNA's Blog Post - 6/21/2010 11:08:13 PM

Murphy hits my digital compass

This weekend Murphy passed by. When checking the direction of the magnetic loop mounted on the antenna rotor, the digital compass hitted the ground and resulted in ..... of course
the lcd display of the compass broken into 4 parts.

This brought me up to the following idea:

Let's check whats in that digital compass that has costed me 15 Euro.

What if we could use this compass to mount on the antenna rotor in order to get the bearing ?

What if we trow in some controller hook it up to HRD-antenna rotor software and reuse for an automated antenna controller?

To be continued ...
Comment from WD0GOF 6/25/2010 9:29:59 PM
Have you heard of O'Mally's axiom to Murphy's law.


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ON3VNA's Blog Post - 6/15/2010 11:47:04 PM

Magnetic Loop 160m-20m

Finally got all parts fixed into one magnetic loop.
Now adays its not so easy anymore to find variable aircapacitors, but a fellow HAM gave me one out of an old radio.

Last saterday was construction afternoon: putting all the tubes together. Some of the construction fixed with tie raps because could get to the right store... XYL always find something the change your plans.

The capacitor i received goes from 25pf up to 500 pf and it is a dual, so can be put parallel or in serie.

I used a gamma match i.s.o. small coupling loop, because i still had some 6mm Cu tube available and it was just in the range i would need for constructing the gamma match.

Up to now the magnetic loop is located in my office installed on a tripod, in order to be able to turn it around.

The other antenna's i have are wire dipoles on the attic with a 1:1 balun.

Compared to that it seems a gain of one point on the reception signal.
Also yesterday evening on 20m i was able to contact Tenerife island from the first trial with the magnetic loop, something that wasn't possible with the wire dipoles.

At this moment in time 160m is not possible because the capacitor doesn't cover that, there is need of one extra capacitor ....

80-40-30-20 m are working.

Next step will be adding a electrical motor for positioning the capacitor.

To be continued.
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ON3VNA Joined My Ham Shack - 3/8/2010 1:22:58 AM

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