[MarinTeams] PSK31 Radio

[Bill Smith]

It looks like the Warbler (80 meter version) is available again.  :^)  It wasn't at the beginning of the year.  It is a direct-conversion receiver.  Two crystals (transmit and receive) set the operating frequency and  8 additional crystals are used in two filters (transmit and receive) also at its operating frequency.  All fine if the crystals are inexpensive ($1) TV color crystals.  Not so good if the crystals cost $10+ each to move the unit to an assigned MARS frequency.  I looked, but couldn't find inexpensive crystals on the right frequency.

$50 is a great price, though.  The design is straightforward, no surprises.  Also, would the crystal filter be too narrow for MT-63 or is the receiver bandwidth 3KHz+ wide?  Believe it is ok.

This is a great option if MARS crystals could be found.   Otherwise, the 40 or 20 meter units are attractive if $100 is in your budget for just the transceiver.  Think the filter is set at a fixed IF frequency and operating frequencies are controlled by either a single crystal, or one each for transmit and receive (don't recall which).  Wonder if changes in coils and new crystals could bring the $100 receiver to 80 meters?

Assumption #1 is 80 meters is a favored band for local (statewide) communications.  Have had good luck on 40 meters in the morning with a Rock Mite, however.

73 de Bill, AB6MT
billsmith at ipswest.com

  ----- Original Message ----- 
  From: Peter Bland 
  To: marinteams at mailman.qth.net 
  Sent: Tuesday, April 27, 2004 9:49 PM
  Subject: [MarinTeams] PSK31 Radio


  I have downloaded the information on the WA7JHZ radio and I will try pricing
  the parts.  Maybe I am misreading the Small Wonders information, but they
  appear to offer an 80M radio for $45 (board assembly only) and a 20M radio
  for $100.  If you are correct, that they have discontinued the 80M radio, I
  am quite happy to build a 20M radio.  Most of the contacts I make on PSK31
  are on 20M anyway.  I will try calling them tomorrow to see what the story
  is.  Regards, Peter



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