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28 ianuarie 2012

LED Voltmeter (for portable QRP ops)

As the summer is already here (HI), I plan to spend some time on YOFF and SOTA-YO so I prepare my portable backpack.
A portable and compact voltmeter is often nedeed but the usual multimeters are bulky, impractical and heavy (for portable use).
Therefore, I made a little voltmeter, which shows the SLA battery voltage via a blinking LED.
I made it around a PIC 16F876A microcontroller using the embedded ADC.
All can be made on a perfoboard as a Do It Yourself (DiY) Project for a raini afternoon.

Here is the schematic diagram (CLICK to enlarge):
















The LED shows the following voltages;

Ind. Volt Collour
LED 1 < 11 V Bright RED
LED 2 11 V - 12 V RED
LED 3 12 V - 12,4 V YELLOW
LED 4 12,4 V - 12,6 V GREEN
LED 5 12,6 V - 13 V GREEN
LED 6 13 V - 13,3 V GREEN
LED 7 13,3 V - 13,8 V YELLOW
LED 8 >13,8 V Bright RED

Al the nedeed files are .rar archived and available for download HERE.

Here is a little movie with the voltmeter:



If you found this usefull, please drop a line!

73 de YO3HJV

PS
A explanatory article was published into the QRP Quarterly (Spring 2012) 
-Page 1
-Page 2 

Here is another link to download QRP Quarterly with SLA PIC Voltmeter.

21 ianuarie 2012

Lustraphone mike, another piece of junk restored...

A few months ago I visit a friend of mine.
In his backyard I found a big stock of junk.
Searhing for some interesting, I found a nice desktop microphone who look a little odd!
I took it for nothing.
Unfortunately, I didn't took any picture before I start to open it. The images here are after some cleaning...
At home, after a little thinking, I opened it and found that the microphone is made by LUSTRAPHONE in England.
A nice transformer was fitted under the transducer. The output is balanced at around 600 Ohm.


I search on the Internet but I found almost nothing about this type. Only this site is exhibit a identical one, only for hire!
I removed the old paint which was horrible and sprayed with a matt-black one.
On the chromed pieces I work witha Dremel brush and restored the shining for a nice contrast.
The front of the transducer was covered with a dense copper mesh which was unrecoverable so I removed it.
The switch is the original one (Labeled also with LUSTRAPHONE). It is a double-section two position but one section was unusable (in shortcircuit) so I had to use only one...

The final result is this (click on photo for larger view):




I used it on a FT-2000 and the audio reports were great!
Nice piece...

Why Lustraphone Ribbon Mike was never at BBC.


Some info about LUSTRAPHONE:

Lustraphone was a contemporary of Grampian and Reslo from the 1950s -- all British microphone manufacturers building ribbon and moving-coil mics mainly for the amateur, semi-pro and PA industries. (http://www.soundonsound.com/sos/mar02/articles/qa0302.asp).

It seems that hey invented the noise cancelling microphone!

19 ianuarie 2012

Ten things about ICOM IC-R20

ICOM just announced that IC-R20 is not longer in production. 
I still have mine.

I have this pretty communication reveiver for more than 2 yrs. I had a lot of fun with and found a lot of use especially on my experiment bench but also to listen to various stations while travelling.
One of the main benefits is the enourmous autonomy from the LiIon battery which keep the receiver "alive" for more than one week. Of course, with some moderation to the loudspeaker volume and around 2 hrs/day listening.
The full characteristics of the ICOM IC R-20 "A.K.A. "features"are to be found on various places on internet so I do not want to trick you to land on my page for this, HI.
Instead, I will emphasize some of the features and some of the missings of this radio.

1. The SSB is missing above 470 MHz. This lead to impossibility to trace faint signals with a waterfall software (like Spectran or SpectraVue);
2. The excessive sensitivity of the front end sometime make impossible to listen to some signals in a strong RF environment; fortunately, the RF level CAN be applied simultaneous with the RF ATTenuator.
3. The memory and scanning is a little weird for someone used with transceivers. Banks and lists are too complicated but I believe it is hard to organise more than 1k slots.
4. A big plus is the "onboard" recorder though the audio format ( .icw) used is obscure and not supported by the programming software. One have to upload the recordings into the scanner and listen with the IC R20 which is stupid! really stupid. But there is solutions! The squelch-activated recording is a nice feature!
5. The original antenna seems to be fragile but I did'nt manage to broke. Yet!
6. The LCD screen is "the best". Simple and effective, visible in the full sun and also at night. The backlight is also, the best I seen.
7. A high level of IMD above 1.5 GHz made this radio tricky to use on some SatCom. I didn't tried in remote places and Bucharest is not the best place for that kind of weak signal receiving.
8. The audio jack is shared with the CAT (CI-V) port. It is mandatory to have some kind of separation between when using headphones. Or to hack a headphone to use it. The built in speaker is not so loud so one will take benefit from a headset in noisy environments.
9. Excellent below 30 MHz and exceptional above 100 MHz; The BC receiving is very nice and the autotune is working well. The SSB is pretty like on a big transceiver.
10. Very quick on scanning memories. Also, the CTCSS/DCS scanning is working very nice.

OK for now...
What about the software? one will ask...

So, there is a programming softare. CS-20 is the "name". With this you will be able to programm the memories and banks. You will be able also to download the recorded communications.
To listen to that recordings is a different story but it is a solution.
You have to use a ICW2WAV utility (audio conversion software)
Also, a steady hand will be able to take the last IF (450 kHz) and send it to a SDR receiver to decode unusual modes while tuning above 1 GHz!
You can use Ham Radio Deluxe to controll the Icom IC R20. With DRM you will be able to decode most of the digital modes below 470 MHz and if you made the IF mod, you will be able to "unleash the beast"!

This are hard to find so, let's organise the files:

-Programming software;
-Service manual;

-ICW2WAV audio conversion software.

Please, be aware that the software is hosted on external server. Use a antivirus software to scan for problems before installing and make a  backup copy because I do not how much that will be there!

73 de yo3hjv

LEdit

So, just happened! Told you to make backup copies!
Fortunately, I was able to find them again so, the links are updated.

LLE (August 28, 2015)
After more than 3 years after the first impressions and tests with other scanners, I strongly believe that ICOM IC-R20 is the best comm. receiver.scanner at his category (portable/handheld). It's not cheap but the quality has a price!
The LiIon battery is doing fine, after this years keeping the radio running for a week or more on moderate use.
There are hardware mods to use a RTL SDR on first IF; one can have all modes on the entire receiving range but a very steady hand and good eyes to do it.
The original antenna is doing fine, beating the record on this kind of antennas!
I was sorry to heard that the rado is no more on production so, if you find one on stock somwhere, grab it before anyone else will do it.

Definetly, a keeper!

18 ianuarie 2012

Save WIKIPEDIA!


Knowledge is power! When someone try to conquer this kind of power in the present, the history and the future are in danger! Please, read Orwell, save and preserve The Free Knowledge of Wikipedia! Let us have past, present and future! Without this, all we'll be soon nothing but slaves!
Say no to Internet Censorship!
www.wikipedia.org

15 ianuarie 2012

International HF "Bucuresti" Contest 2012

We are almost ready to propose you a new format for the traditional BUCURESTI Contest!

Here is a teaser. More information will be soon available on the official page at YO3KSR.


GL & GDX & Happy contesting!
73 de YO3HJV



Organizer:

Romanian Society of Radioamateurs–YO3KSR Club

Date:

March 19, 2012, 16.00-18.59 UTC

Bands/Mods:

80 m

CW – from 3510 to 3560 kHz;

SSB – from 3675 to 3775 kHz;

PSK31 – from 3580 to 3590 kHz

40 m

CW – from 7010 to 7035 kHz;

SSB –from 7090 to 7100 kHz, and from 7130 to7200 kHz;

PSK31 – from 7040 to 7045 kHz

Categories

Can be chosen one of these categories:

- A - QRP - (max.5 W PEP) single operator

- B - LPI - Low power - single operator (max.100 W PEP)

Note: equipment used at this category must be limited to maximum 100W PEP. If transmitter is capable of more than 100W PEP operator must reduce the power at maximum100WPEP

- C - LPG - Low power group – two or more operator (maximum 100 W PEP)

Note: equipment used at this category must be limited to maximum 100W PEP. If transmitter is capable of more than 100W PEP operator must reduce the power to maximum 100WPEP

- D - SWL - receiver (only category « MIXT »)

And one of these working modes:

-E – Mixt – any of two or more transmission modes

-F – Phone – SSB

-G – CW – Morse code

-H – Digi – PSK31

Reports:

- YO stations: RS(T) + serial number starting with 001 + 2 letters code (Bucharest district (a.k.a “sector”) code XA-XF for YO3 stations, or county code for YO counties).

Operators with YO3 prefix will give the report as follow XA-XF only if the transmitter is located in Bucharest XA-XF districts (a.k.a “sector”), if not will give the report accordingly with the county/country where is located the transmitter.

- Foreign stations (other than YO’s): RS(T) + serial number starting with 001 + 2 letters code (code= internet domain. E.g.: Russia=RU, Hungary=HU, Bulgaria=BG, Moldova=MD etc.).


Score

A. YO stations:

- 1 QSO YO3 - YO3, YO – YO, YO – Foreign= 2 pct.

- 1 QSO YO3 - YO, YO - YO3, YO3 – Foreign = 4 pct.

B. Foreign stations:

- 1 QSO with a YO operator or Foreign = 2 pct.

- 1 QSO with a YO3 = 4 pct. (only for transmitters that are located in Bucharest’s districts)

SWL: must log both call signs and both controls transmitted, maxim 5 consecutive QSO’s with the same call sing.

Multipliers: number of counties (AB, AG,... etc.) + number of country codes. (see Appendix) + number of different Bucharest districts YO3 (XA, XB, XC, XD, XE, XF)

Note:

Operators are entitle to work with any station once in CW, once is SSB and once in PSK31 according to band plan described above and multiplier will count only once in such cases. Also QSO’s logged in different bands with same station are scored with the same number of points

Final Score

Final Score = (summ of points of the two bands 80m and 40m) * (summ of multipliers of the two bands 80m and 40m).

05 ianuarie 2012

Vasile Ciobanita, YO3APG - SK

Postez aici, cu intarziere, stirea care deja se cunoaste. Vasile Ciobanita, YO3APG nu mai este intre noi.
Astazi s-a dus sa se odihneasca.
Inainte insa de a se retrage definitiv, a facut ceea ce ii reusea de fiecare data: Ne-a strans din nou laolalta.
Am senzatia insa, ca azi a fost pentru ultima data!
In pofida celor care vedeau in el sursa tuturor relelor din radioamatorismul romanesc, m-am incapatanat sa vad un om care si-a pus o mare parte din energia sa (daca nu intreaga) in slujba radioamatorismului.
Am facut abstractie de sistemul in care evolua si am preferat sa il cunosc si sa il stimez ca om si mi-am permis sa il banuiesc de cele mai bune intentii.
Era peste tot, raspundea tuturor, stia o multime despre multe. Si nu numai despre radioamatori si radioamatorism.
Chiar si atunci cand avea o opinie diferita, discutia in contradictoriu era placuta si aveai la ce sa te gandesti.
Am fost criticat si eu si el pentru calitatea de "Membru de Onoare" al Societatii Romane a Radioamatorilor dar niciodata nu a vrut sa spuna cine anume il critica. Era discret si chiar si aceasta discretie i-a fost reprosata de multe ori.
Sunt multe de spus despre cum a influentat subtil drumul prin radioamatorism al multora si sunt destui care isi datoreaza o cariera lui Vasile. O vor face altii, sunt covins.
Viata e uneori aiurea si te lasa descoperit atunci cand te astepti mai putin.
Acum, Vasile ramane intre noi prin prin carti, inregistrari de QTC, cateva inregistrari video si multe, multe, tare multe amintiri raspandite in toate indicativele cu care s-a intersectat.

Cea mai puternica amintire a mea este cand, intr-unul din putinele momente de liniste, m-a tras deoparte si mi-a marturisit ca de abia asteapta sa se retraga pentru a mai face cateva legaturi caci ii lipsea tare mult asta!

73 de YO3HJV

PS.
Stiam de dragostea sa pentru munte si am descoperit ca nu numai radioamatorii l-au "avut" pe Vasile ci si montaniarzii! Clubul "Floarea de Colt"
este marcat de aceasta disparitie.

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