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HF-Index of pa0nhc technical HAM pages.

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NL

EN

Nieuwe versie met twee gevoelige Vrms-naar-Vdc converters.

Antenna SWRsweeper V2.
20170423

New version with two sensitve Vrms-toVdc converters

PCBs available

NL

EN

Antenne SWRsweeper V1.
Een klein doosje. Via USB met een laptop verbonden.
Versie 1 met variable gain buffer trappen.

20170113

re-editted 20170404
 
Antenna SWRsweeper V1.
A little box, USB connected to a laptop.
Version 1 with variable gain buffer amplifier stages.


SWR curve of a 10m circumference loop on 80m.
Tested at the start of transmission line near the TRX.

EN

 

 

 

 

 

 

 

 

NL

     MAGNETIC 80m band receiving antenna.
Build-in noiseless power supply.
Remotely tune able.
A
daptable for other SW- bands.
Perfect for NVIS (reception of regional signals).
Small, u
nsusceptible.
                               SPECIAL:
Single coax connection between tuning- and antenna unit.
Optimal sensitivity.
Can suppress local noises if rotate able.
Nearly all wired, standard components.

New PCBs / nieuwe printen

MAGNETISCHE 80m band ontvang antenne.
Inclusief storing-vrije voeding.
Op afstand afstembaar.
Aanpasbaar t/m 14 MHz frequentie banden.
Perfect voor NVIS (ontvangst van regionale signalen).
Onopvallend klein, slechts 15x10cm.
                               BIJZONDER :
Enkelvoudige coax verbinding tussen antenne- en afstem eenheid.
Optimaal gevoelig en selectief.
Kan storingen onderdrukken, indien draaibaar opgesteld. Nagenoeg alleen bedrade standaard componenten.

Beware for a bad copied commericial version.


Old antenna unit (Proto type).
In the new design T2 is a BD139.
The connecting cable should be a thin coax.

Dubbelzijdige printen op aanvraag leverbaar = Double sided PCBs available.


New version tuning unit + noiseless power supply PCB.

EN
NL
Finding radio-noise-sources using a special wideband receiver "EMV-spy".
Radio storing bronnen zoeken met een "EMV-spion".
NL The ongoing experiment : 600W PA with BLF188XR.

EN

 


NL

Outdoor magloop for transmitting on 40-(60)-80m with optimal cost/performance ratio.
>> Broadband transformer matching <<.
New 40m transformer => better balance and selectivity.
NO TVI / BCI
New 35mm copper radiator for Max efficiency on 80m.
20170212 : New 40m+80m matching transformer-set, remotely switch able.

Magnetisch raam voor zenden op 40-(60)-80m met optimale prijs/prestatie verhouding.
>> Breedband transformator aanpassing <<
Nieuwe 40m transformator => verbeterde balans en selectiviteit.
GEEN BCI / TVI
35mm koperen straler voor maximaal rendement op 80m.
20170210 : Nieuwe, op afstand omschakelbare, 40m+80m transformator set.

EN
NL

Simple little noise free power supply
Eenvoudig klein stoorvrij voedinkje

12V/185mA dc.
EN

 

 

NL

Active capacitive wideband DX receiving antenna.
Constant sensitivity between 100kHz and 28MHz.
Real class A circuit => ! NO IMD !
(This is a vastly improved version of the "PA0RDT Mini whip").
Renewed version : now with BF998 and BD139.

Partslist updated 20161006

Aktieve capacitive breedband DX ontvang antenne.
Constante gevoeligheid van 100kHz - 28MHz.
Schakeling volledig in klasse A -> ! geen IMD !

(Dit is een sterk verbeterde versie van de pa0rdt "Mini whip").
Vernieuwde versie: nu met BF998 en BD139.


PCBs version 20160701. Factory-made PBs NOT available anymore.

20170227:
Now DIY PDF pcb masks available.
Nu met DIY PDF print maskers.

EN

The "pa0nhc Cobra" symmetrical wire antenna (3.5-14MHz).
This could be THE solution if you want a symmetrical antenna, but you cannot connect a feeder to the center of a antenna.

Feeded with coax at the beginning of the wire radiator.
>>>>> Yet a symmetrical dipole antenna. <<<<<

Minimal induced RF in mains wiring, speaker cables, telephone line => No TVI / BCI !!!!
Low received noise level.
No transformer, just one dedicated coax choke.
Matches to 50 Ohms on lowest band (making strong NVIS signals).
Needs asymmetrical tuner on higher bands.


VERY SPECIAL ====>>

Impossible ? Another "wonder antenna" ?
Check it out !

(In the future i will try to design e new, easy to install, choke construction).

EN


NL

Xfilt DEMO

Xfilt : Filter voor lokale storingen.
Incl. aktief storing antennetje.

Xfilt : Canceling filter for locally generated noises.
Including active noise antenna.

EN

 

NL

The grounding and de-noising
of my antenna system.
20160526
De aarding en ontstoring van
mijn antenne installatie.

EN


NL

- Improved automatic tuner for loop antenna.
Pure analog (Without software).

- Verbeterde automatische tuner voor een raam antenne.
Puur analoog (zonder software).

EN


NL


12V PC SMPS used as a cheap power supply for 100/200W transceivers.
De-noised and completely silent.

pa0nhc 20150621/2060331 / 20160914

12V PC voeding toegepast als goedkope voeding voor 100/200W zendontvangers.
Ontstoord en volkomen stil.

EN

NL

De-noising a common used scoot mobile charger.

Ontstoren van een algemeen gebruikte scootmobiel lader.

NL

 

EN

Ferrite trafo experiments.

EN


NL

Tuning aid for 3.65MHz and 7.1MHz bands.
(Field strength indicator)

20150321

Afstem hulp voor de 80m en 40m.
(Veldsterkte indicator)

EN


NL

- Simple adjustable DC tune-motor driver.

- Eenvoudige regelbare DC afstem motor besturing.

EN

 

 

 


NL

If i get enough response, i will provide professional PCBs.

Radically new designed
top quality 80m ARDF direction finding receiver
with all build-in antennas.

Very small, light, very sensitive,
Sensitivity adjustment range 100dB.
Constructed with modern and cheap,
commonly available components.

01409
Radikaal nieuw ontworpen
top kwaliteit 80m ARDF vossejacht peil ontvanger
met volledig ingebouwde antennes.

Klein, licht, en toch zeer gevoelig.
Gevoeligheid regel-bereik 100dB.
Opgebouwd met moderne, goedkope,
algemeen verkrijgbare onderdelen.


Several 80m ARDF receivers i developed and used.
The most right one is the one presented in this article.

EN

2 Watts 80m CW or AM transmitter for ARDF.
2W CW into 50 Ohms load, 0.5W AM, externally modulated into 50 Ohms load.
Sturdy, withstands very high SWR.
Fixed accurate frequency without adjustments.
Unconditionaly stable and sturdy.

Special designed single sided PCB for good performance and good efficiency.
Resulting in a well filtered signal, no parasitics,
 
If using a 50 Ohms antenna, setup in the field without further adjustments.

2013

EN

80m 65mW AM foxoring transmitter.
Including adjustable modulation tone.
Well filtered, clean signal.
No adjustments with 50 ohms antenna.
20130505

EN

80m beeper
(mini-TX "Sputnik").
Single frequency, simple, stable, clean signal.
CW keyed.
Well filtered, clean signal.
No adjustments.
201305

EN

Directional couplers, HFout and DCout.
7  PCB designs for various connectors and housings
for a DIY double sided PCB.
No coils nor ferrite.
Use able up to 440MHz.
For milliwatt filter in/out SWR measurements and 50W power meters.

Easy, cheap, dependable.