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Taurus receiver ready for test

Taurus receiver board is ready for test

Today the receiver is ready in his first stage. So far known the mods are used and the first QSO is recorded (see *.mov). The next step is de finetuning to hear the stations more easy, have to check the filters and potmeters!

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Back of PCB Motorola

Motorola GM950 small RS232 Interface

Today I have finished the small RS232 interface to manage the Motorola GM950 UHF/VHF transceiver. This small interface will cost you about 10 Euro, and will give you much fun ! I had made the PCB layout on the test board, the design is so small that you can easy do this (see picture). The …

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hamradio

Rotor management extra info by PE1ANS

The rotor soft- and hardware you can find on this site is in the development fase. PE1ANS (OM Jan) had picked up the mean time stage of the development fase with his own few on the software. I nice small movie will show an error in the source code, when you push the button to …

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Rotor house

Rotor management hardware update

In the time we are building on the PCB with the electronics (for PIC controler) I had to bring the old hardware inside a new box. Also the rotation of the Antenna rotor I have to do by hand. But safety first .. the old hardware is build together in a plastic ‘box’ with on …

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1st stage

New rotor management with PIC-controler

“Start to build a new management system with PIC-controler for the Antenna-rotor” The next pictures will give the few of the development of the antenna-rotor interface with a PIC 16F84 controler. The development is started on a breadboard to find the correct parts and programming of the PIC controler. I have started with the most easy …

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Taurus receiver board is ready for testMotorola GM950 small RS232 InterfaceRotor management extra info by PE1ANSRotor management hardware updateNew rotor management with PIC-controler

Nov 16

Found many RF interference from Linksys hardware!

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Interference

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“Today I found the source of a large RF noise on 20 and 40 meter band!”

On the next frequencies (14.151, 14.215, 14.274, 14.333, 14.396 and 7.098, 7080, 7.035 and 21.113, 21.172, 21.297) i heard a large spike signal. A signal with an ‘step over frequency’  (harmonic) of 60 kHz. The signal was so strong that on the ham-band I couldn’t work anymore.

I had switched of all the UTP network and cisco switches.
The noise was gone !

By switching on, one by one .. it seems that the main bad source was linksys IP
SIP phone SPA942 and the Cisco 1 Gb switch SD2005.

The basic idea I found on the website from ehamforum (scroll to the bottom of the
forum .. )

Now I have to find out (or change the hardware =;) to reduce the RF noise on this hardware.

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Oct 21

New antenna active ZS6BKW multiband dipole!

Categories:

Antennas

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“New wired multiband antenna is active, here you see how I build this nice antenne’

This great wired dipole (26 m.)will give you a lot of plessure on the HF-bands.
On the 20 and 40 meter band you don’t need an antenna-tuner, the SWR is nearly 1:1.1 (40 m) and 1:1.3 (20 m) ..
I have to make more tests to make the SWR great on 20 meter.

From the webpgae of OM PA1GF you can see the right values of the wires.
I made the option with 450 Ohm ‘ladderline’ and the RG213 coax cable direct to the
tranceiver. On pic.a you can see how I made the connection from the ‘ladderline’ to the wires. The ‘ladderline’ and the wires are twisted ‘litze wire’ , don’t use massive cable or line !

The next foto (pic b.) is the picture from the plastic tube (40 mm) with to blind ends.
In centre you make a hole as big as the PL-chassis, the other end you make a small notch who is used for the twinlead cable.

The last foto will give you the view how the cable is active at outside.

Wire lint cable Connection tube  In action

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Oct 07

New rotor management with PIC-controler

Categories:

Interfaces

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“Start to build a new management system with PIC-controler for the Antenna-rotor”

The next pictures will give the few of the development of the antenna-rotor interface
with a PIC 16F84 controler. The development is started on a breadboard to find the
correct parts and programming of the PIC controler.
I have started with the most easy program ‘Hello World’
The next step was the basis program and he 3rd stage was the connection to a small relais to stear the antenna rotor.

1st stage  2nd stage  3 th stage
.: First test                                          .: Text on LCD                                .:  Rotor text on screen

The next schema will give you the information where we had start with.
In the next weeks we have to test the combination of the hard- and software.
To show the full page of the schema, click twice on the picture !

Rotor_clockOn the schema you see the X-tal with a value of 10 Mhz, with any other value you have to change the timer (time) in the PICBasic routine.

See the download section for the latest *.zip file !

 

 

 

 

.: First stage rotor schema

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Aug 11

RF Amplifier Bitx 20 ready !

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Bitx 20

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Second part of the Bitx20 is ready, the RF-amplifier .. and tested.
Also the third part, VFO is finished about 90 %
On the next pictures you can see the results .. in de download section you will find
the latest new (dutch) written so far.

In the VFO, I have changed a little the C’s for ceramic one’s (in the kit their are polysterene one’s) because they fit better on the PCB.

RF Amplifier        VFO
.: RF-Amplifier                                      .: VFO – first stage

In the VFO section the 36 V zener is replaced by a 33 V (no why ?) .. and I have to find out if a VFO test in this stage of the build is OK or not.

Coming next .. the VFO on test!

 

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May 23

Bandpass filter Bitx 20 is ready !

Categories:

Bitx 20

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First part of the Bitx20 PCB is ready, the Band Pass Filter’.

The use of the ‘ polysterene’  capacitors is a little weird, the final test we give the
answer after the finished ‘Rf-amplifier’. So far nothing special and started with part2.
See the latest changes in de download section of this site.

Step 1 Bitx 20 ready

 

 

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May 14

Start with the Bitx 20 meter transceiver

Categories:

Bitx 20

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Started with the building of the Bitx20 Tranceiver.

First with the ‘Band Pass Filter’ the L1,L2 and L3 are fixed well ..
The next picture will give the finished part of the PCB. The capacitors I’ve changed a little bit for higher quality. The 33 pF cap. is changed for the 39 pF !

In the download section you can find the (writing in the same time of building)
‘dutch manual .. of the Bitx20′, every time updated after checking the parts etc.

Received parcel
.: Received the parcel with all the hardware!

 

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Apr 08

CAT interface FRG8800

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Interfaces

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First homemade project ready,

Finished the CAT-interface for the FRG 8800 Receiver. This small project is easy to make I used the schema from J.F. Kok with the MAX 232 and his ‘special made’ software to handle the RX.

The interface is made in the ‘open space’ of the 144 Mhz transverter who is not in my RX .. if you have installed the ‘transverter’ you have to made an external box. The power for the interface, will get from the RS232 connection of the PC.

Pictures of the project:

Schema of the interface

All parts          Base position
.: All parts                                               .: Base position

Interface ready          frg8800_ready
  .: Interface ready                                   .:  Back of the FRG8800

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