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1994-11-13
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Date: Tue, 23 Aug 94 16:31:10 PDT
From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu>
Errors-To: Info-Hams-Errors@UCSD.Edu
Reply-To: Info-Hams@UCSD.Edu
Precedence: Bulk
Subject: Info-Hams Digest V94 #953
To: Info-Hams
Info-Hams Digest Tue, 23 Aug 94 Volume 94 : Issue 953
Today's Topics:
Can you 6M U.S. coast to coast?
Communications Quarterly , was Qs on no code FCC license and Hardware
Daily Summary of Solar Geophysical Activity for 22 August
Greasy Popcorn
Help please identifying a signal
How to Use An Auto Patch
Last issued callsigns table?
Mobile Radio Theft Insurance?
QST the logo/QST the signal --- revisited
Request : Baycom Packet on Linux System
VHF: non-FM
Whence QST?
Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Info-Hams Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Tue, 23 Aug 1994 10:57:53 -0400
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!cs.umd.edu!newsfeed.gsfc.nasa.gov!macgwy-mac2.gsfc.@@ihnp4.ucsd.edu
Subject: Can you 6M U.S. coast to coast?
To: info-hams@ucsd.edu
In article <33brdq$nrf@search01.news.aol.com>, sbjohnston@aol.com
(SBJohnston) wrote:
> In article <srphillips.10.000D474B@ccgate.dp.beckman.com>,
> srphillips@ccgate.dp.beckman.com (Steve Phillips) writes:
>
> >Can you 6M U.S. coast to coast?
> >If so, how much power and what antenna type is best?
During Field Day this year, 6 meters was wide open. I worked the west
coast from here at
the Goddard Space Flight Center using a 4 element beam and 10 watts.
One tip I have found is that if 2-meters seems open (or 10) there's a good
chance that 6 will
be as well.
Jim Blackwell, N3KWU
--
Jim Blackwell
Goddard High Resolution Spectrograph Science Support
Computer Sciences Corporation
NASA/GSFC Code 681.0
Greenbelt, MD 20771
------------------------------
Date: Tue, 23 Aug 1994 12:29:09 GMT
From: news.cerf.net!gopher.sdsc.edu!news.tc.cornell.edu!travelers.mail.cornell.edu!news.kei.com!eff!news.umbc.edu!europa.eng.gtefsd.com!sundog.tiac.net!usenet.elf.com!rpi!@@ihnp4.ucsd.edu
Subject: Communications Quarterly , was Qs on no code FCC license and Hardware
To: info-hams@ucsd.edu
David Stockton (dstock@hpqmdla.sqf.hp.com) wrote:
: C. C. (Clay) Wynn, N4AOX (wyn@ornl.gov) wrote:
: : Well, they are doing it here. The rf shops are full of those contester rigs in
: : for the sparkplug changeouts. One of the biggest problems was finding a cheap
: : second source for those @#$%& overpriced HP diodes ;-)
[deletions]
More news coming in a subsequent *QST*, but we have discovered that the
lower-cost answer--and one that should provide practically the same IMD
reduction at amateur frequencies--is to use *Motorola MPN3700* diodes
instead of the HPs.
We will also show that 1N4007 rectifier diodes, although they contain PIN
structures that can provide reasonably good IMD performance compared to
intended-for-RF-switching PINs like the 3081 and MPN3700 *in forward
conduction*, *aren't* a suitable low-cost answer to the 3081 and 3700
because they must be *reverse*-biased to exhibit similar "turned off"
IMD dynamic range compared to 3081s and 3700s that simply have forward bias
removed.
To answer the begged question ("What do I mean by "lower-cost"?): Allied
Electronics carries the HP diodes for (rounded number) $2 each. Newark
Electronics carries the Motorola diodes for (rounded) $1 each. (I suppose
there are volume discounts; haven't factored that in.)
What's also neat is that the Motorola parts are available both in leaded and
surface-mount form--important because so many of our radios are now full of
SMDs. The leaded part is MPN3700; the surface mount (SOT-23
package) is MMBV3700. Newark carries both; they list the MMBV3700 as
MMBV3700L; dunno what the *L* means.
Regards,
David Newkirk, WJ1Z
Senior Assistant Technical Editor, *QST*
------------------------------
Date: Mon, 22 Aug 1994 20:58:41 MDT
From: agate!howland.reston.ans.net!torn!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@ames.arpa
Subject: Daily Summary of Solar Geophysical Activity for 22 August
To: info-hams@ucsd.edu
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
22 AUGUST, 1994
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 22 AUGUST, 1994
----------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 234, 08/22/94
10.7 FLUX=070.6 90-AVG=078 SSN=012 BKI=1201 2212 BAI=004
BGND-XRAY=A1.0 FLU1=8.7E+05 FLU10=1.4E+04 PKI=2211 2233 PAI=008
BOU-DEV=007,011,003,007,010,019,008,019 DEV-AVG=010 NT SWF=00:000
XRAY-MAX= B1.9 @ 0934UT XRAY-MIN= A1.0 @ 2351UT XRAY-AVG= A1.3
NEUTN-MAX= +003% @ 2330UT NEUTN-MIN= -002% @ 0400UT NEUTN-AVG= +0.3%
PCA-MAX= +0.3DB @ 1820UT PCA-MIN= -0.2DB @ 0535UT PCA-AVG= +0.1DB
BOUTF-MAX=55229NT @ 1336UT BOUTF-MIN=55194NT @ 2020UT BOUTF-AVG=55213NT
GOES7-MAX=P:+000NT@ 0000UT GOES7-MIN=N:+000NT@ 0000UT G7-AVG=+083,+000,+000
GOES6-MAX=P:+146NT@ 1931UT GOES6-MIN=N:-024NT@ 2239UT G6-AVG=+111,+029,-004
FLUXFCST=STD:070,070,070;SESC:070,070,070 BAI/PAI-FCST=010,015,010/010,015,010
KFCST=2225 5112 2225 5112 27DAY-AP=006,011 27DAY-KP=1212 1223 3522 1223
WARNINGS=
ALERTS=
!!END-DATA!!
NOTE: The Effective Sunspot Number for 21 AUG 94 was 23.0.
The Full Kp Indices for 21 AUG 94 are: 3- 2- 1- 1o 3o 3+ 2o 1+
The 3-Hr Ap Indices for 21 AUG 94 are: 12 7 3 4 14 18 8 5
Greater than 2 MeV Electron Fluence for 22 AUG is: 1.2E+07
SYNOPSIS OF ACTIVITY
--------------------
Solar activity was very low.
Solar activity forecast: solar activity is expected to be
very low.
The geomagnetic field has been at quiet levels for the
past 24 hours.
Geophysical activity forecast: the geomagnetic field is
expected to be quiet to unsettled for the entire forecast
period. High latitude stations may experience short periods of
active levels, especially during local nighttime.
Event probabilities 23 aug-25 aug
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF Green
Geomagnetic activity probabilities 23 aug-25 aug
A. Middle Latitudes
Active 15/30/20
Minor Storm 05/15/10
Major-Severe Storm 01/05/05
B. High Latitudes
Active 25/30/30
Minor Storm 15/15/15
Major-Severe Storm 05/05/05
HF propagation conditions were near-normal over all
regions. No changes are forecast for the next 72 hours. There
is only a slight chance high-latitude paths may be periodically
degraded during the local night-times, particularly on
transauroral circuits. Overall global conditions should remain
near-normal.
COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS
========================================================
REGIONS WITH SUNSPOTS. LOCATIONS VALID AT 22/2400Z AUGUST
---------------------------------------------------------
NMBR LOCATION LO AREA Z LL NN MAG TYPE
7767 S14W36 313 0020 HSX 02 002 ALPHA
7764 S08W81 358 PLAGE
7766 N09W61 338 PLAGE
7768 S14W28 305 PLAGE
REGIONS DUE TO RETURN 23 AUGUST TO 25 AUGUST
NMBR LAT LO
NONE
LISTING OF SOLAR ENERGETIC EVENTS FOR 22 AUGUST, 1994
-----------------------------------------------------
BEGIN MAX END RGN LOC XRAY OP 245MHZ 10CM SWEEP
0929 0933 0936 B1.9 800
POSSIBLE CORONAL MASS EJECTION EVENTS FOR 22 AUGUST, 1994
---------------------------------------------------------
BEGIN MAX END LOCATION TYPE SIZE DUR II IV
NO EVENTS OBSERVED
INFERRED CORONAL HOLES. LOCATIONS VALID AT 22/2400Z
---------------------------------------------------
ISOLATED HOLES AND POLAR EXTENSIONS
EAST SOUTH WEST NORTH CAR TYPE POL AREA OBSN
NO DATA AVAILABLE FOR ANALYSIS
SUMMARY OF FLARE EVENTS FOR THE PREVIOUS UTC DAY
------------------------------------------------
Date Begin Max End Xray Op Region Locn 2695 MHz 8800 MHz 15.4 GHz
------ ---- ---- ---- ---- -- ------ ------ --------- --------- ---------
21 Aug: 0507 0512 0516 C1.5
REGION FLARE STATISTICS FOR THE PREVIOUS UTC DAY
------------------------------------------------
C M X S 1 2 3 4 Total (%)
-- -- -- -- -- -- -- -- --- ------
Uncorrellated: 1 0 0 0 0 0 0 0 001 (100.0)
Total Events: 001 optical and x-ray.
EVENTS WITH SWEEPS AND/OR OPTICAL PHENOMENA FOR THE LAST UTC DAY
----------------------------------------------------------------
Date Begin Max End Xray Op Region Locn Sweeps/Optical Observations
------ ---- ---- ---- ---- -- ------ ------ ---------------------------
NO EVENTS OBSERVED.
NOTES:
All times are in Universal Time (UT). Characters preceding begin, max,
and end times are defined as: B = Before, U = Uncertain, A = After.
All times associated with x-ray flares (ex. flares which produce
associated x-ray bursts) refer to the begin, max, and end times of the
x-rays. Flares which are not associated with x-ray signatures use the
optical observations to determine the begin, max, and end times.
Acronyms used to identify sweeps and optical phenomena include:
II = Type II Sweep Frequency Event
III = Type III Sweep
IV = Type IV Sweep
V = Type V Sweep
Continuum = Continuum Radio Event
Loop = Loop Prominence System,
Spray = Limb Spray,
Surge = Bright Limb Surge,
EPL = Eruptive Prominence on the Limb.
** End of Daily Report **
------------------------------
Date: 23 Aug 94 02:20:26 GMT
From: elroy.jpl.nasa.gov!swrinde!emory!europa.eng.gtefsd.com!news.umbc.edu!eff!news.duke.edu!duke!wolves!psybbs!org!fidonet!z1!n3641!f1!p1!Ken.Kuzenski@ames.arpa
Subject: Greasy Popcorn
To: info-hams@ucsd.edu
>>> - U.S. President Bill Clinton, 1994
>> Where did you get this jewel of Billywisdom?
j> Slick Willie said this in a press conference when he was
Just my personal opinion, but I'd rather see this
remain free of political argument.
------------------------------
Date: Tue, 23 Aug 94 08:20:12 EDT
From: agate!howland.reston.ans.net!darwin.sura.net!opusc!UNIVSCVM.CSD.SCAROLINA.EDU!T230579@ames.arpa
Subject: Help please identifying a signal
To: info-hams@ucsd.edu
>
>>high of my listening frequency. The signal consisted of 5 character
>>groups of what appeared to be random letters. The data rate is quite
>
>What are these characters then?
>
`yeah, I'd like to know that too...That would be 60% of the analysis/answer...
------------------------------
Date: Tue, 23 Aug 1994 16:16:39 GMT
From: rd1.racal.com!news@uunet.uu.net
Subject: How to Use An Auto Patch
To: info-hams@ucsd.edu
In article j1q@prodsql.prodigy.bc.ca, Paul Antaki <pantaki@prodigy.bc.ca> writes:
>Since I'm new to radio and don't really know any fellow amateurs I turn
>to the net for assistance:
>
>I've noticed that a few local repeaters have autopatches that are open
>(or at least not marked closed). Is there a standard means of accessing
>them? Does anyone have suggestions?
>
>Thanks,
>
>Paul
>-----
>
>Paul Antaki
>Prodigy Technologies Corporation Phone: (604) 687-4636
>1100-1190 Hornby Street Fax: (604) 687-1671
>Vancouver, B.C. e-mail: pantaki@prodigy.bc.ca
>V6Z 2K5
I've seen that you got some good answers about clubs and financial support, but
let me add another twist.
Our company club sponsers three repeaters all with autopatches. Two of the repeaters
are open. Because we are a company sponsered club we cannot accept members who
are not employed by Racal. In addition since the patches are connected to the
company PBX we cannot, by company decree, open the patches to non-members.
It is always best to ask before trying to access a patch belonging to a group
of which you are not a member. Those who try to access ours are politely informed
of our policy. If they persist the machine is turned off by a control operator.
73
Rich
---
+==============================================================+
| Richard Joerger |
| joerger@rd1.racal.com |
| Racal-Datacom, Sunrise FL |
| 305-846-6132 |
+==============================================================+
------------------------------
Date: Tue, 23 Aug 1994 10:53:47 -0400
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!haven.umd.edu!cs.umd.edu!newsfeed.gsfc.nasa.gov!macgwy-mac2.gsfc.nasa.gov!user@network.
Subject: Last issued callsigns table?
To: info-hams@ucsd.edu
In article <336c20$9vm@search01.news.aol.com>, tstader@aol.com (TSTADER) wrote:
> In article <333hpu$4n0@dolphin.phoenix.net>, jracz@phoenix.phoenix.net
> (Jeff Racz) writes:
>
> As far as I can tell... the one for August 1st has not been released...
> judging from the date of last months... I don't expect it for another
> couple of days!
>
> 73 for now.... c u on the shortwaves
> Terry Stader - KA8SCP
> America Online Ham Radio Club Host
> Internet: tstader@aol.com (files <28K) or
> tstader@si.tiac.net ( files >28K)
> KA8SCP@WA1PHY.#EMA.MA.USA.NOAM
> ka8scp@ka8scp.ampr.org [44.56.4.82]
Does anyone know where/how to get this information ?
Jim Blackwell, N3KWU
--
Jim Blackwell
Goddard High Resolution Spectrograph Science Support
Computer Sciences Corporation
NASA/GSFC Code 681.0
Greenbelt, MD 20771
------------------------------
Date: 23 Aug 1994 09:32:20 -0500
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!cs.utexas.edu!not-for-mail@network.ucsd.edu
Subject: Mobile Radio Theft Insurance?
To: info-hams@ucsd.edu
<1994Aug17.143959.23702@mixcom.mixcom.com> wrote:
: In <dginsberg-1608941254300001@198.207.32.23> dginsberg@gte.com (Don Ginsberg) writes:
: >Does anyone know of specialized insurance companies that
: >will sell a stand-alone policy on ham radio equipment
: >mounted in your car. I believe that the ARRL has such
: >a service. Anyone know of others? An idea of prices?
Contact the ARRL directly and they will provide you with information. I
beleive they use Albert Wohler Insurance Agency. The same agency has been
handling their claims for years. It is an excellent program, and includes
insurance on all your equipment - whether lost or stolen, including
lightning protection (except antennas).
ARRL phone number is 203-666-1541. Just ask the operator about the ARRL
equipment insurance and she'll point you in the right direction.
--
Marc Grant | Sr. Systems Engineer | Unit EA-83240
marcbg@esy.com | E-Systems Garland Division | POB 660023
| 214-205-4593 | Dallas, TX 75266-0023
"Opinions expressed are my own and not necessarily those of E-Systems Inc."
------------------------------
Date: 23 Aug 1994 17:05:43 GMT
From: agate!howland.reston.ans.net!europa.eng.gtefsd.com!uhog.mit.edu!news.kei.com!yeshua.marcam.com!charnel.ecst.csuchico.edu!olivea!news.bu.edu!taco.cc.ncsu.edu!csemail.@@ihnp4.ucsd.edu
Subject: QST the logo/QST the signal --- revisited
To: info-hams@ucsd.edu
OK Dave, you win this quibble....
>From Dave Newkirk, WJ1Z at QST (arrl.org):
>Historiographical quibble: ARRL didn't borrow *QST* as its logo for the
>magazine; because *QST* magazine wasn't bought by ARRL until 1919. *QST* was
>originally owned and published by ARRL's cofounders, Clarence D. Tuska and
>Hiram P. Maxim. Why did they and not the entity called ARRL start/own *QST*
>at first? Because they had just founded ARRL, and ARRL the entity therefore
>had no money worth mentioning. (Almost at once, by the way, the light came
>on a bit more brightly and they incorporated as the QST Publishing Co to
>protect themselves in case the new venture went bankrupt.) In no way did
>they start *QST* as a money-making venture; it was nip and tuck--largely
>nip--until they threw in the towel in the face of WW I and the resulting
>government closedown of Amateur Radio.
>Regards,
>David Newkirk, WJ1Z
>Senior Assistant Technical Editor, *QST*
OK, I worded that incorrectly. I should have mentioned that Hiram and
Clarence were the ones who footed the bill out of their pocket, technically
before ARRL took it over. Clarification, noted. There was a note in
the front of the premier issue to that effect, but I was not thinking
about that at the time. Hence, technically Hiram and Clarence borrowed
the QST logo from QST the signal.
Granted QST was not originally set up as a money-making matter. It was,
in reality, something like the several large club newsletters that have
been published over the years, even to this day. QST just took off, tho,
where the others basically stayed with the club level interest. Back
in the 1920's and 1930's there were several large club newsletters that
were works of art and great fun to read (based upon the few surviving
copies I have seen).
But, the question of where the QST as a logo or other historical radio
notation originated is still a bit up for further discussion and general
clarification. In reading what early issues of QST and other various
radio documents and books that I have in my library or have been able
to find (complete QST to 1922, but with holes back to the premier issue,
and most of the major radio books dating from E. Bucher's works in 1917),
it is not exactly clear from whence the logo originated. My contention
is that Hiram and Clarence borrowed it from the standard commercial
Q-signals of the day, that should have originated at about the time of
the Titanic sinking. My sources only go back to 1921, where I can
trace it to the Radio Communication Pamphlet No. 40 of the Signal Corps,
dating from May, 1921 (see appendix 7 page 566). The implication from
that appendix is that it was a standard government list of signals,
``to be used for all general public service radio communication'',
and that suggests that it came into being with the Safety of Life
conventions in 1910/1912 or so. The accepted designation for the
signal QST is ``General call to all stations'' or the interrogatory
form ``Have you received the general call to all stations?''
Hence, Hiram and Clarence would have borrowed if from there,
since it was a nice way to say in print ``This is a general call to
to all stations.''
There are a number of ham folks who are of the opinion that it was invented
by the boys at ARRL/QST (to include Hiram and Clarence). It was not.
That was the point I was trying to make.
Any further clarification you have on this matter, official or unofficial,
as long as it can be traced somewhere, is most welcome. I am having
trouble finding records predating WWI.
73
Bob
NA4G
rdkeys@csemail.cropsci.ncsu.edu
**************************************************************************
* 73 TU SU SK DE NA4G ``Boat Anchor Bob'', an ol' CW fart. *
**************************************************************************
* Morse has been in the family for over 100 years. *
* Morse radiotelegraphy (Spark/CW) has been in the family since 1914. *
**************************************************************************
* May you have fair winds and following seas on your watch at the key. *
**************************************************************************
------------------------------
Date: 23 Aug 1994 13:26:36 +0200
From: olivea!spool.mu.edu!howland.reston.ans.net!EU.net!ub4b!idefix.CS.kuleuven.ac.be!rc1.vub.ac.be!info.vub.ac.be!info.vub.ac.be!not-for-mail@ames.arpa
Subject: Request : Baycom Packet on Linux System
To: info-hams@ucsd.edu
Does anyone know how I can hook up my Baycom Packet Modem
to a Linux/Unix System ?
Is there software available comparable to the PC/MS-DOS
soft Baycom1.5 for a Linux System ??
Wim BONTE
wjbonte@info.vub.ac.be
***************
*SuperSmallSig*
***************
------------------------------
Date: 23 Aug 94 16:51:48 GMT
From: news.cerf.net!gopher.sdsc.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!yeshua.marcam.com!news.kei.com!eff!news.duke.edu!convex!cs.utexas.edu!howland.reston.ans.net!agate@ihnp4.ucsd.edu
Subject: VHF: non-FM
To: info-hams@ucsd.edu
Just a reminder: A mailing list exists for those interested in non-FM VHF+
operation. To subscribe, send mail to:
vhf-request@w6yx.stanford.edu
with the message:
subscribe vhf
Volume averages about three messages per day.
--
-=Paul Flaherty, N9FZX | "We are meant to be masters of destiny,
->paulf@Stanford.EDU | not victims of fate." -- Ronald W. Reagan
------------------------------
Date: Tue, 23 Aug 1994 12:41:52 GMT
From: news.cerf.net!gopher.sdsc.edu!news.tc.cornell.edu!travelers.mail.cornell.edu!news.kei.com!eff!news.umbc.edu!europa.eng.gtefsd.com!sundog.tiac.net!usenet.elf.com!rpi!@@ihnp4.ucsd.edu
Subject: Whence QST?
To: info-hams@ucsd.edu
Stan Olochwoszcz N2AYJ (n2ayj@n2ayj.overleaf.com) wrote:
[neat stuff from R. D. Keys, NA4G, about meaning and use of the Q-signal
*QST* deleted; following excerpt is Bob Keys's copy]
: QST was borrowed by the ARRL as its logo for the magazine in 1915, starting
: with the first issue, since it was the ham equivalent of a "general
: call to all stations", in print.
Historiographical quibble: ARRL didn't borrow *QST* as its logo for the
magazine; because *QST* magazine wasn't bought by ARRL until 1919. *QST* was
originally owned and published by ARRL's cofounders, Clarence D. Tuska and
Hiram P. Maxim. Why did they and not the entity called ARRL start/own *QST*
at first? Because they had just founded ARRL, and ARRL the entity therefore
had no money worth mentioning. (Almost at once, by the way, the light came
on a bit more brightly and they incorporated as the QST Publishing Co to
protect themselves in case the new venture went bankrupt.) In no way did
they start *QST* as a money-making venture; it was nip and tuck--largely
nip--until they threw in the towel in the face of WW I and the resulting
government closedown of Amateur Radio.
Regards,
David Newkirk, WJ1Z
Senior Assistant Technical Editor, *QST*
------------------------------
Date: Tue, 23 Aug 1994 13:33:09 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!sundog.tiac.net!usenet.elf.com!rpi!psinntp!arrl.org!zlau@network.ucsd.edu
To: info-hams@ucsd.edu
References <wyn.134.2E5352E5@ornl.gov>, <Cuxs3v.Gru@hpqmoea.sqf.hp.com>, <1994Aug23.122909.8660@arrl.org>d.
Subject : Re: Communications Quarterly , was Qs on no code FCC license and Hardware
Dave Newkirk (WJ1Z) (dnewkirk@arrl.org) wrote:
: We will also show that 1N4007 rectifier diodes, although they contain PIN
: structures that can provide reasonably good IMD performance compared to
: intended-for-RF-switching PINs like the 3081 and MPN3700 *in forward
: conduction*, *aren't* a suitable low-cost answer to the 3081 and 3700
: because they must be *reverse*-biased to exhibit similar "turned off"
: IMD dynamic range compared to 3081s and 3700s that simply have forward bias
: removed.
Maybe that is why I've had no trouble using 1N4007 rectifier diodes--my
inexpensive biasing technique using 470 ohm resistors does *reverse* bias
those diodes during turn-off. People have commented to me that they tried
them and they didn't work but they work fine for me. :-).
--
Zack Lau KH6CP/1 2 way QRP WAS
8 States on 10 GHz
Internet: zlau@arrl.org 10 grids on 2304 MHz
------------------------------
End of Info-Hams Digest V94 #953
******************************