Next VE Session – October 7, 2017

VE Sessions are held at the SEMARA Clubhouse, 54 Donald Street, Dartmouth, Massachusetts on the first Saturday of even months at 10:30 AM.

Although walk-ins are welcome, we recommend that you contact us ahead of time if you plan to attend an upcoming session.

SEMARA’s VE Team Leader is Frederic S. Bacon, III, N1TF. He can be reached at 508-748-0047 or exams [at] semara [dot] org.

SEMARA Library Additions

Latest additions to SEMARA library license/upgrade holdings:

  • 3rd Ed. (Tech) Ham Radio License (spiral bound)
  • 6th Ed. Tech Q & A
  • 8th Ed. General License (spiral bound)
  • 5th Ed. General Q & A
  • 11th Ed. Extra License (spiral bound)
  • 4th Ed. Extra Q & A

These books are available for use only in the clubhouse; do not remove.  They are marked as SEMARA property.

The spiral bound format allows easy copying of a few pages, as needed.

Are there other titles that should be added to the club’s library?
Send your suggestions to w1aec [at] semara [dot] org.

Clean Sweep!

Thanks to these club members for accomplishing a clean sweep of the clubhouse prior to the professional cleaning of the floor tiles.

Furniture movers extraordinaire:

  • Ray Arruda, KB1EVX
  • Marcel Dumont, W1MLD
  • Marty Jordan, KA1YFV

Cyclone Cleaning was paid to do the tiles.

SEMARA Cleanup Party

These SEMARA members helped with the cleanup on Saturday, July 22, 2017:

Marcel, W1MLD
Joe K., N1IXC
J.P., AG1Y
Marty, KA1YFV
Ray, KB1EVX
Mike, W1BXJ
Roland, KB1KZA
Anthony, KB1UAM
Chuck, KB1FRL
Dick, K1AHA

Removal of metal:

Kevin, KA1VNP

Removal of junk and trash:

Carlos from Jose Melo & Sons.

(Submitted by Marcel, W1MLD)

Next VE Session – August 5, 2017

VE Sessions are held at the SEMARA Clubhouse, 54 Donald Street, Dartmouth, Massachusetts on the first Saturday of even months at 10:30 AM.

Although walk-ins are welcome, we recommend that you contact us ahead of time if you plan to attend an upcoming session.

SEMARA’s VE Team Leader is Frederic S. Bacon, III, N1TF. He can be reached at 508-748-0047 or exams [at] semara [dot] org.

Next VE Session – June 3, 2017

VE Sessions are held at the SEMARA Clubhouse, 54 Donald Street, Dartmouth, Massachusetts on the first Saturday of even months at 10:30 AM.

Although walk-ins are welcome, we recommend that you contact us ahead of time if you plan to attend an upcoming session.

SEMARA’s VE Team Leader is Frederic S. Bacon, III, N1TF. He can be reached at 508-748-0047 or exams [at] semara [dot] org.

Tech Talk – A One Transistor Marvel Transceiver

[UPDATE] At the June 1st 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