Bayou Jumper outstanding features explained to Dxers Unlimited's world audience by Arnie Coro CO2KK
Prof. Arnaldo Coro Antich
Here is the text of the script of Sunday 22 January Dxers Unlimited radio hobby program...
A description of the outstanding features of the Bayou Jumper receiver-transmitter kit, including the amazing regenerative set sensitivity !
73 and DX
radio amateur CO2KK
Host of Dxers Unlimited radio hobby program
Radio Havana Cuba
Radio Havana Cuba
Dxers Unlimited's weekend edition for Sunday 22 January 2017
By Arnie Coro
radio amateur CO2KK
Hola amigos radioaficionados all around the world.. I am Arnaldo, Arnie, Coro your host here at the weekend edition of Dxers Unlimited, the one and only radio hobby program covering almost all of the 91 different ways we can enjoy playing with our radios and accesories...
First news item... the Sun making a come back of sorts, after stalling for about 10 days at the beginning of 2017... Sunspots are back in sight and the daily 10.7 centimeters solar radiation flux has moved up to around 85 units... Correspondingly the next few days will see better propagation conditions on the short wave bands, especially between 10 a 21 megaHertz... Item two.... good news coming from the European Broadcasting Union...
They are announcing a New dot radio Internet Domain
The EBU is launching a new Top Level Domain (TLD) name -dot .radio - aimed at the radio community including Radio Amateurs
The launch is planned for September 2017 and the EBU says this which will progressively change the way people are reaching Internet resources linked to radio.
These categories will be accepted for the use of a dot .radio domain:
• Radio Amateurs
• Radio broadcasting stations
• Unions of Broadcasters
• Internet radios
• Radio professionals (journalists, radio hosts, DJs, …)
• Radio-related companies selling radio goods and services
Item three: More and more radio amateurs around the world are learning standard electronic workshop procedures, like soldering , measuring circuit parameters, reading circuit diagrams , also learning how to visually identify electronic components, and all that new knowledge opens the way to start building the new generation of user friendly radio kits...
Yes, I am very pleased to say that several of the most recently advertised via Internet amateur radio transceivers kits intended to be assembled at home using simple hand tools and standard measuring equipment like the now classic digital multimeters have proven to be very reliable after proper assembly.
One recent example is the Bayou Jumper solid state QRP transmitter receiver rig, that was derived from the World War II Paraset rig used by paratroopers launched behind enemy lines and by freedom fighters in countries occupied by the Nazis to communicate vital information. The twenty first century version uses all solid state components for the regenerative detector receiver and the power transistors transmitters... Limiting the coverage to a narrow segment of the 40 meters band has proven to be a very wise decision, because it has helped to create more activity on the 40 meters band segment between 7100 and 7125 kiloHertz... Of course that this little rig is a CW only transmitter... and it is able to receive also single side band voice signals as well as digital modes. Among the bright ideas brought forward by the radio club that is promoting this kit of parts we must include the use of coils that are part of the printed circuit board supplied with the kit of parts. Coil winding to exact specifications has proven to be a long time problem for home builders. The Bayou Jumper, spelled B A Y O U J U M P E R uses a single easy to wind toroid coil for the receiver... The Bayou Jumper Transceiver was designed by two American radio amateurs Jim Giammanco N5 IB and David Cripe N M Zero S---- Here are now some
Specifications and Design Features of this very interesting amateur radio 40 meters band transmitter and receiver set
N5IB: Original prototype development, receiver development, PCB and panel layouts, part sourcing.
NMØS: Transmitter design, PCB, panel, parts sourcing, assembly manual.
RXTX Design: Separate receiver and transmitter, built in RIT..
T/R Switching: Hand switched with a chicken head knob, just as in the old days.
Single Bander: 40M as supplied.
Toroids: Only one toroid to wind in the receiver, and none in the transmitter. Only ONE for the whole rig!
NO SMT: All parts are through hole, there are NO surface mount devices in the kit.
Current Requirements: Receiver 20ma, Transmitter 750ma
Enclosure: Beautiful silk screened panel and commercial wooden box, for a very retro look. Dim. L x W x H, 7.75" x 5.5" x 3.25"
Stay tuned for more radio hobby related information coming to you from Havana, Cuba where we are expecting a powerful cold front to change our weather on Monday...
short musical intercut
This is Radio Havana Cuba, the name of the show is Dxers Unlimited, I am Arnie Coro, radio amateur CO2KK , and here is more about how volunteer groups around the world are promoting the home assembly of ham radio equipment by designing rigs that can be successfully completed thanks to the use of high quality electronic components , extremely well designed and made printed circuit boards as well as excellent step by step instruction manuals...
The Bayou Jumper solves many of the problems found in previous attemps of making kits by addressing the most frequent failures of those projects, like for example the need to wind several toroidal ring inductances using very fine wires... a task that is quite a challenge for the older radio amateurs and also to younger less experienced home builders ....Now I am going to share with you the specifications of the performance achieved by the Bayou Jumper kit.... Amazing as some them may seem to be they were all fully verified with advanced electronic test instruments... here we go:
Tuning and Regeneration: Grounded front panel, and insulated shafts on the controls, so hand effect detuning is minimized.
Sensitivity: -120 dB (approx S1). Well below the typical rural band noise level of approx. -100dB (approx. S4).
Tuning Range: Tuning range approximately 120 to 150 kHz.
One Knob tuning: No bandset/bandspread needed.
Varactor Tuning: Varactor tuning employing readily available Schottky diodes as varactor diodes.
RF Gain: Optional RF attenuator control, useful when employing full-scale antennas.
Audio: Plenty of headphone audio, and will drive a small speaker.
NS-40: Integrated into the PCB is Dave's famous NS-40 Class E transmitter. More info here
Crystal Controlled: The rig has a socket for the old-style FT243 crystals, plus 7030 and 7122 kHz crystals and included crystal adapters.
If you have old 7MHz Novice crystals, you can use them with this rig!
Output Power: Solid 5 Watts.
No Toroids: No toroids to wind, all inductors are etched on the pc board.
Keying Options: Straight key built into the front panel, just like the original Paraset! Also includes a 1/8" jack so you can use it with your favorite mechanical key, or an electronic keyer with an interface, such as one of these.
Spotting: You can activate the crystal oscillator at low power to allow zero beating the receiver to the transmit frequency.
Final Amp: Cool running robust MOSFET.
Spectral Purity: All harmonics and spurious emissions are 50dB or more below the carrier.
Using a half wave 40 meters band dipole antenna fed via a one o one balun with 50 ohms coaxial cable, my 5 Watts output QRP transceiver provides good two way contacts under normal propagation conditions... My daytime coverage reaches all over the Cuban archipelago, and at night I can work all over the Americas, Europe, Western Africa. Under very good propagation conditions early pre sunrise propagation of 40 meters makes possible DX contacts with Japan, Australia, New Zealand and many Pacific Islands nations--- Now at the end of the show... a short form HF bands propagation update::. Conditions have improved and will continue to improve due a slight but noticeable increase in solar activity... see you all at the middle of the week edition of Dxers Unlimited next Tuesday and Wednesday UTC days just after the half hour newscast here at Radio Havana Cuba.
On 21/01/17 17:07, David Martin davemrtn@... [4sqrp] wrote:
LA HABANA, 20 ene (Xinhua) -- Empresas de Cuba y China firmaron este viernes 10 acuerdos para fortalecer la cooperación en energías renovables e industria tras finalizar un foro binacional de tres días que buscó ampliar el intercambio en estos temas.
Con la participación de 18 empresas chinas y 20 cubanas el foro sirvió para acelerar el análisis de las estrategias de cooperación de energías renovables entre ambos países analizando la potencialidad de desarrollo y la demanda actual de la isla.
Asimismo, el evento permitió aprovechar la capacidad de las empresas chinas para dar solución integral al desarrollo, producción de equipamiento, construcción, operación y administración en las áreas fotovoltaica, eólica e hidráulica.
"Desarrollar la industria de la energía renovable es uno de los enfoques principales de Cuba y China pues es una manera muy eficiente de impulsar el desarrollo de la economía", manifestó a Xinhua, Gu Chengkui, director del Centro de Información para el Desarrollo Industrial de China.
Gu, quien presidió la delegación china a la cita, indicó que este foro empresarial ha sido una manera eficiente que ha encontrado el Ministerio de Industrias de Cuba y la entidad que él dirige para impulsar la cooperación bilateral.
Entre los acuerdos firmados destaca un memorándum de entendimiento entre el Grupo de la Electrónica de Cuba y la empresa china Haier para el establecimiento de una empresa mixta y un centro de desarrollo, investigación y aplicaciones de las energías renovables.
Asimismo se rubricó una carta de intención entre el grupo de la Industria Sideromecánica y la empresa Sany de China para la fabricación y desarrollo conjunto de torres eólicas y grúas.
De igual forma el mismo grupo cubano y el grupo Yutong firmaron un acuerdo para el desarrollo de ómnibus eléctricos con fuentes renovables de energía. También la empresa CNAICO de China buscará el desarrollo conjunto y ensamblaje en Cuba de vehículos eléctricos.
"Las ideas que tiene Cuba para el desarrollo de la industria renovable son muy positivas y con los conocimientos y la experiencia de China podemos de conjunto impulsar y desarrollar la industria cubana", afirmó Gu tras la firma de los instrumentos jurídicos.
Cuba busca incrementar el uso de energías renovables particularmente a través de parques fotovoltaicos y eólicos, haciendo un uso provechoso de la luz solar y el viento.
Actualmente la isla genera 4,65 por ciento de su energía a través de fuentes renovables o limpias y aspira llegar al 24 por ciento en 2030.
Las inversiones en infraestructura industrial cubana permitirán la sostenibilidad de cada proyecto vinculado al uso de las fuentes renovables además de contribuir al ahorro por sustitución de importaciones y el surgimiento de nuevos empleos.
El gobierno cubano busca diversificar sus fuentes de energía y socios comerciales tras las dificultades enfrentadas el pasado año en el suministro de petróleo desde Venezuela que cayó drásticamente debido a la fuerte crisis económica en ese país sudamericano.
Prof. Arnaldo Coro Antich
Si amigo Jim ! There are several Cuban amateurs with the Cl and CM prefixes operating between 7100 and 7125 kiloHertz, and of course also CO old timers too. Looking forward to working you and other 4sqrp members around 7121 to 7122 kHz.
Looking at the possibility of duplicating the Bayou Jumper receiver with some modifications required by the locally available electronic components... In the case of the transmitter it is going to be totally different because of the lack of PC boards that can be etched... But, be assured that our re'used PC boards serve the purpose of anchoring parts in a sort of Manhattan style construction....
Hope to work you soon on 40... that according to my winter/spring season forecasts should be about the best option for working DX stations within the 1000 to 2000 miles range...
73 and DX
On 21/01/17 18:24, n5ib@... [4sqrp] wrote:
Hello Arnie,toggle quoted messageShow quoted text
I monitor/work QRP frequencies all day/every day and have worked a few CF
in the 7100-7125 part of the CW band.
I understand these are beginner types. At your convenience, drop us some
on this class of Cuban licenses. ( Power - frequency(s)- modes, ect. )
Sam Neal N5AF
----- Original Message ------
Received: Sat, 21 Jan 2017 05:33:27 PM CST
From: "'Prof. Arnaldo Coro Antich' email@example.com [4sqrp]"
To: firstname.lastname@example.org, email@example.com
Subject: Re: [4sqrp] Bayou Jumper outstanding features explained to Dxers
Unlimited's world audience by Arnie Coro CO2KK
Si amigo Jim ! There are several Cuban amateurs with the Cl and CM
prefixes operating between 7100 and 7125 kiloHertz, and of course also
CO old timers too. Looking forward to working you and other 4sqrp
members around 7121 to 7122 kHz.
Looking at the possibility of duplicating the Bayou Jumper receiver with
some modifications required by the locally available electronic
components... In the case of the transmitter it is going to be totally
different because of the lack of PC boards that can be etched... But, be
assured that our re'used PC boards serve the purpose of anchoring parts
in a sort of Manhattan style construction....
Hope to work you soon on 40... that according to my winter/spring season
forecasts should be about the best option for working DX stations within
the 1000 to 2000 miles range...
73 and DX
On 21/01/17 18:24, firstname.lastname@example.org [4sqrp] wrote:
Excellent write up, Arnie.
I can add that the receiver is quite stable though the tuning is quite
fast so a steady and slow hand is required to tune in another station
just right. The audio through the headphones is good and clean and the
radio does not lack for sensitivity. Selectivity is, of course, much
more broad than with my Elecraft K3. That just means I have to become
better skilled at focusing on the signal I am copying when another
station transmits close by.
The transmitter just works.
You'll have a lot of fun when you get some similar sets up and running.
"The optimist proclaims that we live in the best of all
possible worlds. The pessimist fears this is true."
Ham radio, Linux, bikes, and more: http://www.n0nb.us