please post following

RAY FRIESS rayfrijr at MSN.COM
Wed Sep 19 19:20:38 EDT 2007

And how would one go about "fixing" these units so they could be used?
Take a handbook design and rewire?  Again, referring to the Palomar 300.  What components does it lack that a handbook sweep tube amp has?
  ----- Original Message ----- 
  From: Glen Zook<mailto:gzook at> 
  Sent: Wednesday, September 19, 2007 5:07 PM
  Subject: Re: please post following

  You just don't get it!

  Yes, use of such an amplifier by a licensed amateur
  radio operator operating within his/her privileges is
  perfectly legal IF the spectural purity of the unit
  meets 47 CFR Part 97 Section 97.307.  This is a

  Unfortunately, the vast majority of such amplifiers
  built for the "illegal" market do NOT meet the
  technical specifications of 47 CFR Part 97 Section
  97.307.  As such, they should NOT be used until they
  can meet the FCC specifications.  This generally means
  modification of the unit.  A goodly number of these
  "CB" amplifiers are not really "linear" in their
  amplification and therefore produce all sorts of
  spurious signals.

  Now there are a VERY few of these amplifiers that are
  of sound design even though they cannot obtain
  certification for use on the amateur radio bands
  because of drive levels and the fact that they can
  amplify signals within the "CB" band.  Now until late
  last year when 47 CFR Part 97 was modified it was
  illegal to commercially produce any amplifier that was
  capable of amplifying a signal between 25 MHz and 35
  MHz.  Now it was legal for an amateur to modify a
  linear for 10 meter operation as well as any
  amplifiers that were commercially produced before 28
  April 1978 were exempted.  In addition, home brew
  amplifiers built by licensed amateur radio operators
  were also exempt from these regulations.

  The new regulations restrict commercially produced
  amplifiers from being able to amplify frequencies
  within the "CB" band but now allow amplifiers with 10
  meters to be again produced.

  Way too many of these "CB" type amplifiers produce
  "buckshot", "splatter", distortion, and so forth,
  especially when operated anywhere near the published
  power levels.

  The fact that most of these amplifiers use sweep tubes
  has nothing to do with the problems in signal quality.
   There are a number of bonified amateur radio
  amplifiers (i.e. the Dentron GLA and GLB series) that
  use sweep tubes.  Also, the ARRL published several
  sweep tube amplifier designs that appeared in QST, the
  ARRL Amateur Radio Operator's Handbook, the SSB
  Manual, etc.  In addition, there were such designs
  published in 73, CQ, Ham Radio, and other magazines. 
  But, these designs met the FCC technical

  Yes, there are those amateur radio operators who are
  using the "CB" type amplifiers.  Some of those are of
  the "better" designs that operate properly.  Some of
  those have been modified to meet the technical
  specifications.  Unfortunately, especially on 10
  meters, there are a number of operators who are using
  these types of amplifiers without any modifications
  and, to put it bluntly, their signals "stink"!

  Again, it is PERFECTLY for a licensed amateur radio
  operator to use these "CB" type of amplifiers so long
  as they are operating within their privileges and IF
  the spectural purity of the emissions meet 47 CFR Part
  97 Section 97.307.  But, if the amplifer does not meet
  those specifications then it is definitely ILLEGAL to
  use the amplifier.  If the amplifier can be modified
  to meet the technical specifications then it is most
  certainly fine to use it after it is modified. 
  However, to use the amplifier when it does not meet
  the specifications is illegal.

  Glen, K9STH

This list is a public service of the City of Tempe, Arizona

Subscription control -
Archives -

More information about the Boatanchors mailing list