QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/digests/equip/940091.txt

Internet Message Format | 1994-11-14 | 12KB

Date: Sat,  2 Apr 94 04:30:24 PST
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Subject: Ham-Equip Digest V94 #91
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Ham-Equip Digest            Sat,  2 Apr 94       Volume 94 : Issue   91

Today's Topics:
                  Hamfest List - Mid Atlantic States
                             Q: FT890 mod
          RF and AF speech processors. Was: FT-990 vs TS-850
                Which HF rigs have Transverter Jacks?

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policies or positions of any party.  Your mileage may vary.  So there.
----------------------------------------------------------------------

Date: 31 Mar 1994 19:43:38 -0500
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!news.intercon.com!news1.digex.net!access.digex.net![e-mail]
Subject: Hamfest List - Mid Atlantic States
To: [e-mail]

           MID-ATLANTIC HAMFEST LISTING                March 31, 1994


The following is a listing of known hamfests in the MD/NJ/PA/VA area.
I will update this list as necessary. Please send any additions or
corrections to me at [e-mail] so that others may benefit.

Thanks,

Chris Smolinski, N3JLY


  April 10, 1994:

HAMCOMP '94 8AM-1PM, $5 adm, $12 tailgating, $20 table.
Trenton State College, Rt 31, Ewing Township.
Talk-In 146.67-, 146.52 simplex.
Contact Don Write AA2F [phone].


  May 15, 1994:

HAMFEST '94, 7AM-2PM, $5 adm, $8 tailgating, $12 tables.
Middletown Grange Fairgrounds, Penns Park Rd, Wrightstown, PA
Talk-In 147.09/R, 146.52 simplex
Contact: George Brechman N3HBT [phone]


  May 21, 1994:

Cherryville Hamfest, 8AM-2PM, $6 admission, $10 tailgating, $15 tables
Warren County Farmers Fairgrounds, Rt 518 North, Harmony, NJ I78-exit 3.
Contact Keith Burt, KF5FK, [phone] before 10PM
VE Test Session Contact Marty Grozinski, NS2K, [phone] before 9PM
Talk-In 147.375+ & 146.820-


  May 22, 1994:

Great Hagerstown Hamfest, 8AM-3:30PM, $5 adm, $5 tailgating, $20 tables
Hagerstown Jr COllege Rec Center, Exit 32B from I-70, right at Edgewood Rd
Contact Page Pyne or Fred Bailey [phone]
VE Exams 9AM contact Pat KQ8E at [phone]
Talk-In 146.34+


  June 5, 1994:

Ole Virgina Hamfest, 8AM-3PM
Prince William County Fairgrounds, Manassas, VA


  June 19, 1994:

Father's Day Hamfest, 8AM-3PM, $5 adm, $5 tailgating
Walkersville Fire Co, Walkersville, MD, rt 15 to rt 26 to rt 194
Frederick Amateur Radio Club, PO Box 1260, Frederick, MD 21702
Talk-In 146.52, 147.06+, 448.425-


  July 10, 1994:

Maryland Hamfest, 8AM-?, tailgating opens at 6AM
Timonium Fairgrounds, York Rd, I-695 to I-83 to Timonium Rd
BRATS, PO BOx 5915, Baltimore, MD 21208
VE Exams 10AM, Pre-registration required
Talk-In 147.03+, 224.96-


  July 16, 1994:

Red Rose Repeater Assn, 9AM-3PM $5 adm, $5 tailgating, $20 tables
McCaskey High School, Reservoir & N Franklin Streets, Lancaster, PA
Red Rose Repeater Assn, PO Box 8316, Lancaster, PA 17604
Talk-In 147.015+


  August 7, 1994:

Southern Patuxent Hamfest, 7AM-2PM, $5 adm, $5 tailgating, $25 tables
Prince George County Equestrian Center, Upper Marlboro, MD
Rt 301/ Rt 4, exit 11-A (Rt 4 Pennsylvania Ave) from DC Beltway I-495
Contact: Southern Patuxent ARC, PO Box 399, St Leonard, MD 20685
         [phone]
Talk-In 147.15

Hamfest 94, 8AM-?, $5 adm, $3 tailgating
Bucks County Drive In Theater, rt 611, 6mi N of Pa Turnpike exit 27
Mid Atlantic Radio Club, PO Box 352, Villanova, PA 19085
Talk-In 147.06, 145.13


  August 14, 1994:

SARA Carroll County Hamfest, 8AM-?, $5 adm, $5 tailgating, $8 tables
Carroll County Ag Center, Smith Ave, Westminster, MD
Contact: Alan Parker, KS3L, [phone]
         SARA Hamfest, 607 Brentwood Rd, Linthicum, MD 21090
Talk-In 146.52, 224.68, 224.64


Hamfest & Computerfest, 8AM-?, $4 adm, $7 tailgating, $25 tables
Career Institute of Technology, Easton, PA
Delaware-Lehigh ARC, RR 4 Greystone Bldg, Nazareth, PA 18064-9211
[phone]
Talk-In 146.70


  September 9 & 10, 1994:

Queen Wilhelmina State Park,  Mena, Arkansas. $2 park entrance fee, $5 adm.
Contact Gerald Wallis, N5KKD, [phone]


  September 17&18, 1994:

Virginia Beach Hamfest $6 adm, $15 tailgating, $30 tables, $125 booths
Virginia BEach Pavillion
Manny Steiner, K4DOR, 3512 Olympia Lane, Virginia Beach, VA 23452
(804) HAM-FEST


  September 18,1994

South Jersey Radio Assn, 8AM-3PM, $5 admission, $5 tailgating
Pennsauken High School Parking Lot, near US rt 130 / NJ rt 73
Contact Diane Nafis, N2LCQ, [phone], [phone]
VEC Test Session registration at 9:30 AM
Talk-In 145.290-


  October 30, 1994:
Mason Dixon Hamfest 8AM-?, $5 adm, $5 tailgating, $15 tables
Carroll County Ag Center, Westminster, MD
Mason Dixon Hamfest, PO Box 763, Hanover, PA 17331
VE exams $5.60, 9AM, reg 8AM, Page Evans NE3P, [phone]
Talk-In 145.410-



------------------------------

Date: 1 Apr 1994 14:21:06 GMT
From: usc!howland.reston.ans.net!pipex!sunic!trane.uninett.no!eunet.no!EU.net!Germany.EU.net!netmbx.de!zrz.TU-Berlin.DE!zib-berlin.de!news.belwue.de!news.uni-stuttgart.de!news@@ihnp4.ucsd.edu
Subject: Q: FT890 mod
To: [e-mail]

Hi there !

I read about the modification of a FT890 for TX 1,5 to 30 MHz.
During the procedure a selection of "mode" "02 on" is mentioned.

Does anybody know what the other possible settings do ?

Thanks !
Wolfgang  DH9SBR

------------------------------

Date: Fri, 1 Apr 1994 08:22:10 GMT
From: lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin052!hpqmoea![e-mail]
Subject: RF and AF speech processors. Was: FT-990 vs TS-850
To: [e-mail]

Alan Bloom ([e-mail]) wrote:

: Crystal filters designed for receive filtering are not optimum
: for a transmitter SSB generator.

: AL N1AL


   Yippeee !      Thanks, Alan.  That one little fact is always a shock
to everyone I explain it to.

   Think of two expensive-grade Japanese rigs in QSO.  The transmitting
rig will have an SSB generator with crystal IF filter, an RF clipper (Tx
IF would be a better adjective) and another SSB crystal filter. For
economy, the radio will use SSB filters designed for Rx selectivity as
the same filters are switched into the receive path. Serious Dxers will,
of course, have changed them for especially narrow ones.  At the
receiving end, the posh radio on receive will have two SSB crystal
filters in use, one in its 9-ish MHz IF, and one in its 455 kHz IF.

   The sound that reaches the listener's ears can have passed through
FOUR receiving-spec crystal filters, some or all of which could be
special extra-narrow ones.

   We are talking of up to 32 poles of crystal filtering, as four sets
of 8-pole 2.4kHz wide sections.  Just look in Zverev to see the group
delay and ringing characteristics.

   Those filters are important in the receiver, but quite inappropriate
in the transmitter, we could halve the damage done to the sound quality.

   My thoughts for a home-brew ultimate rig are running towards phasing
SSB generation, IF speech processing and then a >3kHz wide crystal
filter as a post-clipper clean-up.  Carrier and opposite sideband
suppression will be the sum of the performance of the phasing system and
the crystal filter, so neither need produce spectacular performance.

    Experiments have shown a good, clean, controlled output spectrum,
limited by power amp intermod products, and the audio quality was
outstanding.


   Here in the 1990s I'm daydreaming about DSP'ing a similar scheme,
Hilbert-transform based SSB generation, arithmetic clipping, and a
digital SSB filter feeding a DAC producing a low IF to make a cheap and
excellent SSB generator/speech processor.

   Multiband audio processing looks attractive, but it is the peak of
the sum of all the bands that is what has to be controlled, so I think
this may not be the best technique. There is, of course no technique
that is RIGHT, but some are better than others....

   Amusingly, some of the fancy DSP based speech processor techniques
turn out to be "RF processors" in digital form.

    Cheers,
              David

  (It's refreshing to have a decent technical debate going in place of
the code wars and hand-held questions...)

------------------------------

Date: Fri, 1 Apr 1994 15:01:14 GMT
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!swrinde!emory!wa4mei!ke4zv![e-mail]
Subject: Which HF rigs have Transverter Jacks?
To: [e-mail]

In article <1994Apr1.002144.141549@yuma> [e-mail] (Galen Watts) writes:
>Subject line says most of it.  I know the Kenwood TS-820 has 'em and I've
>heard the TS-430 has 'em, but I'm not sure.  I'm mostly interested in
>synthesized rigs, but any info is greatly appreciated!!!
>Galen, KF0YJ

Icom IC-735 has them, IC-725 doesn't.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | uunet!rsiatl!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244     |                     |

------------------------------

Date: 1 Apr 1994 12:46:17 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!darwin.sura.net!news.larc.nasa.gov!grissom.larc.nasa.gov![e-mail]
To: [e-mail]

References <[e-mail]>, <[e-mail]>, <[e-mail]>larc.n
Subject : Re: RF and AF speech processors. Was: FT-990 vs TS-850

In article <[e-mail]> [e-mail] (Zack Lau (KH6CP)) writes:
>The point is, does the audio phase shift networks used in the 2010
>cause a noticeable degradation in audio quality as perceived by
>the users of the radio?   And, since we are primarily talking
>about SSB, as opposed to AM, there is *no* benefit to having
>a detector that can correlate the upper and lower sidebands--we
>only have one sideband to work with on receive.

Yes, indeed, it does cause a noticeable degradation in audio quality.
In the case of units like the 2010 which are primarily going to be used
to listen to commercial broadcasters, there is a good bit of benefit in
having a detector that can correlate both sidebands, though admittedly
for ham work, it's much less of a requirement.

But it basically comes down to how much audio degradation you mind.  If
I am listening to a commercial shortwave broadcaster, I expect much higher
fidelity than I do from amateur SSB transmission.  With SSB, I just want
to be able to make out the words.  (On the other hand, I expect a lot
more from wideband FM broadcast, although I don't always get it...)
--scott
--
"C'est un Nagra.  C'est suisse, et tres, tres precis."

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End of Ham-Equip Digest V94 #91
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