Month: December 2015

Elecraft KX3 and 27 mhz (CB band)

Elecraft KX3 and 27 mhz (CB band)

Elecraft KX3 and 27 mhz (CB band)

Hello everybody,
somebody can turn up his nose if we talk of the best SDR transceiver that we want able to transmit on the 27MhZ (CB Band). Well, it’s true. We can use a simple 100$ Citizen Band transceiver – and enjoy it but… the first love will always be for ever! I believe 90% of us had first ham radio QSO on 27.555 MhZ – USB. At the end of the day, we happy user of KX3, would like to have the opportunity to transmit on the CB band / 11 meters band!

CB band SSB
CB band SSB transceiver

I did a quick search on internet to look for mods for our Elecraft KX3 to be able to transmit on 27 MhZ (CB band). The best would be to find mods for wide band transmitting. This is what I’ve found for you.

It seems there is a “widebander software tool” that is able to do the job…  (expanding the bands but except the 27 Mhz band). Just look for it on the net.

The best thing to do is to contact the Elecraft support team as I did:
You can (or at least, used to be able to) ask Elecraft for the K3 MARS TX unlock software. Here is the information received from Elecraft:
—————————————————-
“Please find hereby attached the software to remove the TX Band limit and you’ll be able to work MARS frequencies. It is upon to the radioamateur to make sure he’s operating in conformity of law over the authorized frequencies. We cannot be held responsible for any unauthorized operation.

Please note that CB band is blocked for transmit at high power. It will not engage the KPAxx on this band. You can transmit. Only at low power (10-12watts). Do not forget to share with us your mod if you’ve found one! If you like to have more link / video please send down your comment. We, Elecraft KX3 users, would like to have a open band transceiver! 🙂 PLEASE, ELECRAFT, let us do the mod 🙂 It should be easy for everyone. It looks like somebody did it and he is able to transmit on the citizen band. . .only 5 watts yes, but this OM did a great job (we cannot tell more but …you can go here): click down here on the arrow.

Thanks
Best regards

Used Elecraft KX3 for sale

Used Elecraft KX3 for sale

Used Elecraft KX3 for sale

Are you definitely looking for a used Elecraft KX3 for sale? Here you landed on the right website.
Here you have some hints / clues where to buy a used one (Elecraft KX3 for sale):

1) Obviously you can start searching on www.ebay.com

2) There is the Elecraft KX3 fan group where many users sell and buy used KX3 and accessories JOIN NOW https://www.facebook.com/groups/830296513660511/?fref=ts

3) Try on swap ham radio – website dedicated to ham radio users

4) You can also find good deals on QRZ FORUM ham radio gear for sale

5) Also Ham radio outlet (specially if you live in the states)

6) If you live in Italy you can find precious resources on ARI FIDENZA forum. Some of them can also post to Europe.

Never forget to pay always via paypal. As you may know there are a lot of fakes around or yaesu ft 817 for sale that are not in “good shape”. I hope these informations may help you finding your Elecraft KX3 and / or FT 817 ND QRP radio. If you are looking for NEW elecraft KX3 at “discounted price” (100$) less please click down here on the arrow to get directed to the link

 

 

Best regards  &  73
IZ0JOJ

Balun designs

Balun designs

Balun designs

First of all , please remember:
Baluns will not improve SWR (the exception is where a balun used as part of a matching network,
I like to design and creat baluns by myself. Quality is top notch. Don’t waste your money buying some of the cheap china knock-off’s. Do by yourself. Follow our balun designs. Well made.

The balun should do only two jobs.
1.Isolate transmission line
2.Provide balanced output current

Proper balun designs
A properly engineered balun will include these design points: High winding inductance (reactance) and Low stray capacitance. Very short internal transmission lines- << 1/4 wave (remember:  the shorter the better). High power components- High voltage wire and insulation to withstand high power or a mismatch. Large wire gauge reduces I2R losses. Large cores because help to prevent saturation and provide the necessary high inductive reactance values on the low bands.

Schermata 2015-12-11 alle 01.00.06
balun designs
Schermata 2015-12-11 alle 01.00.11
balun designs
balun designs
balun designs

Balun designs considerations
High choking reactance, 250Ω minimum
(limits low frequency response)
Low stray capacitance
(limits high frequency response)
Short transmission line, << ¼ wave
(The shorter, the better)
High power handling
Minimize resistive losses
Correct core selection
Robust mechanical design
Line Impedance, Z0
For 1:1 make equal to load and line impedance
For 4:1, make geometric mean of line and load impedance (e.g., 50Ω to 200Ω requires 100Ω line)

Useful Links
Balun Designs LLC – High quality baluns and ununs – The best website if you wanna buy one already built
Balun designs – nice book! Enjoy – few bucks and will be yours!
———-I suggest you to watch this nice video on BALUN designs – click down here on the arrow—–

 

 

 

 

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Ham radio logging software

Ham radio logging software

Ham radio logging software

Many times you encounter a ham radio logging software but..which one is the most reliable, most common to find in our shacks? Which advantages, disadvantages have they got? Let’s review them one by one. I would like to start from a macintosh one:

MacLoggerDx
link : 
http://dogparksoftware.com/MacLoggerDX.html
Organizing and filtering the spots from your favourite DX Cluster for DXing, Contesting or casual rag-chewing. MacLoggerDX supports up to hundred radios, automatically tuning to the spots you are interested in, swinging your beam around. Alerting you to rare contacts or Band Openings and looking up, displaying on 2D, 3D and Satellite Maps and logging your contacts to a super fast sql database. MacLoggerDX can also email you when the Bands are open or that rare DX is spotted. Awards Tracking, Band Activity, Schedules, Memories, QSL Generation, ADIF import, export, Club Log integration, eQSL, LoTW Confirmations.
I have been using this nice software since a long time now…and I believe it’s the best one for MAC computers among the ham radio logging software available. I would rate it 9/10

Ham radio logging software
Ham radio logging software

Aether
Link : http://www.aetherlog.com
Aether is a new ham radio logging application for Mac OS X. This ham radio logging software includes tools to quickly and easily log QSOs while on the air, as well as organize, search and track your QSOs later.  This is very nice , well made software and not very heavy. I would rate it 8/10

BBlogger
link: http://www.bblogger.eu
This is a nice software for PC user – totally free. Thanks to IK2VIW Giorgio.
BBLogger current features (release 1.0.4.9): Full management of a A.R.S. in Hunter mode (complete) or Expeditioner (Light)  – Full management of a SWL station – Dedicated interface – Multi-log and multi-user managing. – Integrated Packet Cluster Radio and Telnet Terminal – new features. 30 different languages or accents announcing the incoming spot. – Integrated Terminal “BBTerm” for digital radiocommunications (RTTY, PSK31/63/125, FSK, MFSK16, GMSK) based on MMVARI by JE3HHT engine –  Integrated CAT based on Omnirig by VE3NEA, interface supporting CAT softwares for Icom TRX by IZ2BKK – Log, labels and QSL cards printings, standard or custom. – Management of 152 Awards, printings and graphic management of many of them.  – Custom awards management.  – Statistics management. – Connection with a Callbook: RAC / Worldcall / Radamato / QRZ.com (only for QRZ subscribers) / HamQTH (free!) – Link to QRZ.com, HamQTH and Google Maps on-line – Multi-lingual support: Italian, English, French, German, Spanish and Polish. I would rate it 9/10.

 

What is software defined radio

What is software defined radio

What is software defined radio

Very simple to answer. The SDR (that’s the acronym) is a new concept that is arising since 30 years in the ham radio (but not only) field.

What is software defined radio
What is software defined radio

It was the 1983 when the first software defined radio was introduced. That’s because semiconductor technology has improved both in terms of performance capability and cost. Technology like SDR (software defined radio)  have emerged from military and research and development labs.

What is Software defined radio?
Software defined radio is a radio that has the ability to be transformed through the use of software or re-definable logic. This radio is able to take advantage of digital processing. To do that, the traditional analog signal must be converted to and from the digital domain. This is accomplished using analog-to-digital (ADC) and digital-to-analog converters (DAC).

What are the limits of software defined radio?
Despite the fact that an ADC or DAC connected directly to an antenna is a desirable end goal, there are issues with selectivity and sensitivity that an analog front end can remedy. The alternative to digitizing at the antenna is the use of a completely flexible analog front end (AFE) capable of translating a wide range of frequencies and bands to that which the data converters themselves can adequately process.

Software defined radio is the ideal candidate to be used for multi-carrier, single-carrier, single-band, multi- band and multi-mode transceiver.

In the case you are still asking What is software defined radio .. we can say it is implementing a receiver together with the  transmitter) in a software. Such software defined radio will perform much better than an analog one, because filters can be made much closer to ideal (steep slopes, high rejection of unwanted RF signal. Do not forget also the advanced algorithms can be implemented to do things that are not so easy in analog hardware (e.g., automatically tuned notch filters).

Advantages of software defined radio:

1) Design Flexibility
2) Upgradable
3) Reliability
4) Reconfigurable

Some links where to get more information on the topic What is software defined radio?

http://www.rtl-sdr.com (one of the most famous software defined radio)

https://greatscottgadgets.com/sdr/  (Great set of video tutorials)

QRP on the bike

QRP on the bike

QRP on the bike

DSC03698
QRP on the bike
  • Hi everybody!
    Today I just had fun while riding my bike. It was nice to have a walk in Bordeaux and then standing in front of the city getting many QSO with my MP1 superantennas and my loyal Elecraft KX3. It was a nice to do QRP on the bike.DSC03693
    Together with my bike, the Trek FX 7.2, I drove out of the city center. I stopped there, on the waterfront, laying the bike just on the wall and then I deployed the MP1. My MP1 superantennas is a modified QRP antenna: I changed the top whip with the one from buddipole. I increased so far the length of the whip by 1 meter. Not so bad. (see photo).
    DSC03696
    The Solar flux was 108 while the K factor was 3. Very bad propagation settings.
    But… together with my QRP Elecraft KX3 and 5 watts… I had chance to get:
  • S5SR on 30 meters band  (10.115 MhZ) who gave me a 599 report in CW
  • UA3HRP on 15 meters band (21.224 Mhz) with RS of 57 (USB)
  • DF2OB on 20 meters band (14.310 Mhz) with RS of 58 (USB).
  • IZ8FFC on 17 meters band (18.130 mhz) with RS of 57 (USB).
  • SV9GLL on 20 meters band (14.219 mhz) with RS of 59+10 (USB).
    My general recommendation if you like to do QRP on the bike is to use a mountain bike – and to get with you a MP1 supernantennas. Another option could be to get a dipole or the famous alexloop antenna. The End fed antenna is the best option because is easy to transport. The best ham radio setup I believe is represented by the YAESU FT 817 ND because of the rugged construction. Elecraft KX3 has the ATU enclosed but is not a rock like the ICOM 703 or FT 817.

    I really enjoyed going QRP on the bike. Please see down here the VIDEO (click on the arrow)

 

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