Tech Talk – A One Transistor Marvel Transceiver

At the May 4th Business Meeting, Joe Tavares, KC1BGF, will give a Tech Talk on the “One Transistor Marvel” transceiver. It is a Dave Ingram K4TWJ design that Joe found in a QRP builders book.

The circuit is a one transistor crystal-controlled CW transceiver. The oscillator puts out about 200 mW in the 40-meter band. On receive, a hi-Z crystal earphone across the emitter resistor picks up signals that beats with the oscillator.

This is basically a crystal set with a BFO.

When the code key is pressed, it becomes a transmitter and transmits on 40-meters.

It can be connected to a full size 40 meter antenna. A one or two foot length of wire will work just fine for experimenting.

Shown in the upper right is a pi network you can add to the transceiver.  Its function is to filter out unwanted frequencies.  IJoewill eventually add one to his unit but it will work without it.  Joe needs to find the right toroid to wind the coil for 40 meters.  Joe’s unit is built into an Altoids case.

Joe found that when he connected the earphone, the transmitter won’t work.  He then decoupled the earphone with a 10 uH coil in series with the earphone; and the transmitter started working again.  He figured it would have a high reactance to RF; but it does allow audio to the earphone.  That is the only change he made to the circuit.  Joe hopes his addition doesn’t cause the oscillator to chirp

These are the values for the pi network:

40 m   470pf    16t  #28 wire on T-50-2 toroid
30 m   330pf    13t  #28
20 m  .220pf    12t  #28

 

Joe Tavares, KC1BGF

Technician, General & Extra Licensing Classes

Three Different Licensing Classes

  1.  Nashua Radio Club — Amateur Extra Class
    April 28-30, 2017
    Dartmouth Hitchcock Nashua
    2300 Southwood Drive
    Nashua, NH.
    You can find more information at <http://n1fd.org/license-classes/>.
  2.  Genesis ARS — General License Class
    May 13 and 20, 2017
    Plymouth Airport
    Genesis ARS meeting room
    Contact: Chris N1IR, <chrisjohnson2003@gmail.com>
  3. Cape Ann ARA — Tech-in-a Day Class
    May 13, 2017
    Contact: Rick Mayberry <rmaybury@ppg-i.com>

 

New England QSO Party

New England QSO Party on May 6th and 7th, 2017

Saturday 4pm EDT to Sunday 1am  EDT
sleep for 8 hours;
Sunday 9am EDT to Sunday 8pm EDT

The NEQP is a great time to check out antenna systems and offers a moderately paced opportunity to work new states and countries.   You’ll find a wide variety of participants, from newcomers to experienced contesters, all interested in making contacts with New England stations.

The New England QSO Party is 20 hours long overall, in two sections: 4pm Saturday thru 1am Sunday, and 9am Sunday thru 8pm Sunday. read more

MRD 2017 – MARITIME RADIO DAY

MARITIME RADIO DAY – http://www.trafficlist.net/mrd/

Date: 14th April 12.00 GMT to 15th April 22.00 GMT
Bands: 160m, 80m, 40m, 30 m, 20m, 15m & 10m
Mode: CW only

Exchange QSA, QRK, name, callsign of last or favorite ship, aircraft,or maintenance company QSA 1 .. 5, strength of receive signal, QRK 1 .. 5, readability and additionally a TR, msg and/or a QTC if you like.

Whitey  K1VV/NJPJ 

W1AA/MSC: International Marconi Day – Jan. 18, 2017

Jan. 18, 2017 – 0001Z to 2359Z

W1AA / MSC – The Marconi Radio Club will represent the 1901 Marconi Shore Station “MSC” in Siasconset on Nantucket Island off the coast of Massachusetts.

We will NOT operating from Nantucket Island as the 1901 “MSC” location is now on private property and inaccessible.

KM1CC – The Marconi Cape Cod Radio Club will have two stations active for International Marconi Day.

During the most famous sea-going disaster of the twentieth century, the Siasconset station played a critical role. Late on the night of April 14, 1912, duty operator Matt Tierney received distress signals from the sinking Titanic’. Siasconset was the first mainland wireless station to receive them, and he immediately alerted all other stations of the tragedy.

DX QSL via the W1 Bureau; Stateside QSL via K1VV with a #10 Business size envelope SASE.

For Information – https://www.qrz.com/lookup/km1cc

Marconi Station Cape Cod History:
https://www.nps.gov/caco/planyourvisit/marconi-beach.htm

“MSC” Marconi 1901 Station History:
https://www.nha.org/history/hn/HN-fall90-wireless.htm

(Submitted by Whitey K1VV)

Starts Jan. 11: Technician Class at Sturdy Memorial Hospital

Sturdy Memorial Hospital ARC offers a Technician Class:

Classes starts on Wednesday, January 11th at 7:00 pm-9:30 pm.
Classes are held in Conference Room A,B,C at the Sturdy Memorial Hospital. It will run for 9 weeks and will end with a test session.

There is no cost for the class; but students must buy the class text/workbook for $30.00.

To sign up, email Gary – KB1KA at kb1ka@cox.net.

(Adopted from EASTERN MASSACHUSETTS SECTION NEWS – January 2017)

S/E Station K7Z for Zane Grey’s Birthday

Zane Grey was born January 31, 1872. Members of the Tonto Amateur Radio Association, Inc. will be active from January 28 – 31, 2017 to celebrate his birthday. They will use the special event call sign K7Z. Members will be operating from their own QTHs as well as from the Zane Grey Cabin in Payson, AZ.

Preferred frequencies will be in the General band segments. Like Us? Spot Us! A special QSL card will be available for the event.

Complete details at  https://www.qrz.com/db/k7z.

(From Bruce Sperka, AD7MM bsperka@gmail.com)

Special Canadian Call Sign Prefixes

Special call sign prefixes celebrate Canada’s Sesquicentennial. Radio Amateurs of Canada (RAC) has secured permission for all Canadian radio amateurs to use special call sign prefixes to celebrate the 150th anniversary of Canada’s Confederation during 2017.

Starting on January 1, 2017 radio amateurs and clubs with:

  • VA-prefix call signs may use CF
  • VE-prefix call signs may use CG
  • VO-prefix call signs may use CH
  • VY-prefix call signs may use CI

Use of the special prefixes is optional, and Canadian radio amateurs may choose if and when to use the special prefix at any time during 2017.

VY1AAA, the Yukon Canam Contest Club, will use the special call sign XK150YUKON from January 1 until March 1. For the rest of 2017, VY1AAA will operate using either CI1AAA or VY1AAA.

FARA 2-Meter QSO Party – January 21st

January 21, 2017
Two operating periods – 1500 to 1700  &  1900 to 2100 EST.

The Falmouth Amateur Radio Association (FARA) will sponsor another
2-meter QSO Party this January. The first of these was held in 2010 and
was well received. The event is open to all those in Eastern MA. The
time coincides with the ARRL VHF contest.
Details: <http://www.falara.org/announcements/faraqsoparty5-mode2mfm>
(Updated per Jim, WA1GPO).