[TenTec] receiver testing
WD4K
WD4K2 at Charter.net
Tue Jun 24 23:31:22 EDT 2003
After posting my opinion of "seat of the pants/good ears" receiver testing,
I was really surprised to get a bunch of mails supporting my position...and
no flames..that's a shocker!
But what I read here was better than my personal observations and comments.
The posts of Dave, K8MN and John W3ULS really make the point with some great
historical observations and good logic...and more eloquently stated than my
post.
Great comments and right on target... Well said, 73, Tommy
-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of
tentec-request at contesting.com
Sent: Tuesday, June 24, 2003 9:53 PM
To: tentec at contesting.com
Subject: TenTec Digest, Vol 6, Issue 62
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Today's Topics:
1. Re: RE: Topband Digest, Vol 6, Issue 20 (Jim Reid)
2. Re: RE: Topband Digest, Vol 6, Issue 20 (Gary Hoffman)
3. Re: RE: Topband Digest, Vol 6, Issue 20 (Mark Rauchfuss)
4. Omni V SOLD...K8ML...Mark Leslie (rr1632)
5. Re: [TenTec]Rig tests
6. RE: RE: Topband Digest, Vol 6, Issue 20 (Keith Lodahl)
7. Re: RE: Topband Digest, Vol 6, Issue 20 (Mark Rauchfuss)
8. Re: Tnx es my 2 cts (Dave Kamp, KW0D)
9. Re: RE: Topband Digest, Vol 6, Issue 20
(Robert & Linda McGraw K4TAX)
10. omni V (JOHN)
11. Omni V & VI MIXER Question (Rick Williams)
12. Re: Omni V & VI MIXER Question
(Dr. Gerald N. Johnson, electrical engineer)
13. Re: Omni V & VI MIXER Question (John)
14. RX320D Digital IF out (John T. Fleming)
15. RE: GPS Antenna feedline (Kevin J. Rowett)
----------------------------------------------------------------------
Date: Tue, 24 Jun 2003 09:00:41 -1000
From: "Jim Reid" <jimr.reid at verizon.net>
To: <tentec at contesting.com>
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <00a001c33a82$ec125610$c8394104 at NewOne>
References: <HAEAJMNPIELHPCHBDEEPKEBICEAA.WD4K2 at Charter.net>
<3EF89A8A.57225AE6 at earthlink.net>
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Message: 1
> I've had the Orion
> for about a month-and-a-half. It has been my opinion that it has the
> finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> beginning to think I should sell the piece of crap and buy a
second-hand
> FT-757 ;-)
>
> What to do, what to do...
Hey, Dave, I will be happy to buy it from you, for the "crap"
value. Will put it right here beside MY Orion; which I have
no intention of selling, hi. It certainly IS the best I have
ever had. Am anxiously awaiting Carl's full blown Orion
software program, soon.....maybe even later this week?
73, Jim KH7M
------------------------------
Date: Tue, 24 Jun 2003 15:18:33 -0400
From: "Gary Hoffman" <ghoffman at spacetech.com>
To: <tentec at contesting.com>
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <011601c33a85$675bd9c0$6301a8c0 at AA2IZ>
References: <HAEAJMNPIELHPCHBDEEPKEBICEAA.WD4K2 at Charter.net>
<3EF89A8A.57225AE6 at earthlink.net>
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Reply-To: Gary Hoffman <ghoffman at spacetech.com>, tentec at contesting.com
Message: 2
Dave,
I'll sell you a used Hot Water 101 Cheep ! :)
73 de Gary, AA2IZ
----- Original Message -----
From: "Dave Heil" <k8mn at earthlink.net>
To: <tentec at contesting.com>
Sent: Tuesday, June 24, 2003 2:38 PM
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
> WD4K wrote:
> >
> > This Orion testing has gone from questionable to absolutely ridiculous.
> > Isn't anyone here going to question statements of personal opinion
cloaked
> > as fact??
>
> For days now I've been sitting and reading these comparisons and I'm
> beginning to think that I have no idea what makes a good receiver and
> what makes a bad receiver. Over the past twenty or so years I've owned
> Drake ("full Sherwood") C-Lines, TR-7's, the Ten-Tec Paragon and the
> Omni VI (option 3). I've used TS-930's, TS-940's, TS-950's, TS-830's,
> TS-850's, TS-870's, FT-1000D's, FT-1000MP's, FT-1000MP Mk V's, FT-1000MP
> Fields and, oh yes, FT-757's (various incarnations). I've had the Orion
> for about a month-and-a-half. It has been my opinion that it has the
> finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> beginning to think I should sell the piece of crap and buy a second-hand
> FT-757 ;-)
>
> What to do, what to do...
>
> Dave Heil K8MN
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
------------------------------
Date: Tue, 24 Jun 2003 15:27:02 -0400
From: "Mark Rauchfuss" <mark.rauchfuss at worldnet.att.net>
To: <tentec at contesting.com>
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <00e801c33a86$995acfc0$d738570c at oemcomputer>
References:
<HAEAJMNPIELHPCHBDEEPKEBICEAA.WD4K2 at Charter.net><3EF89A8A.57225AE6 at earthlink
.net>
<00a001c33a82$ec125610$c8394104 at NewOne>
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Message: 3
You are right! I'll buy that piece of trash for say $150.00
Deal? (hi hi)
Mark
KD7WEO
----- Original Message -----
From: "Jim Reid" <jimr.reid at verizon.net>
To: <tentec at contesting.com>
Sent: Tuesday, June 24, 2003 3:00 PM
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
>
> > I've had the Orion
> > for about a month-and-a-half. It has been my opinion that it has the
> > finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> > beginning to think I should sell the piece of crap and buy a
> second-hand
> > FT-757 ;-)
> >
> > What to do, what to do...
>
> Hey, Dave, I will be happy to buy it from you, for the "crap"
> value. Will put it right here beside MY Orion; which I have
> no intention of selling, hi. It certainly IS the best I have
> ever had. Am anxiously awaiting Carl's full blown Orion
> software program, soon.....maybe even later this week?
>
> 73, Jim KH7M
>
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
------------------------------
Date: Tue, 24 Jun 2003 15:57:16 -0400
From: "rr1632" <rr1632 at dragonbbs.com>
To: <tentec at contesting.com>
Subject: [TenTec] Omni V SOLD...K8ML...Mark Leslie
Message-ID: <200306241557.AA20447840 at dragonbbs.com>
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Message: 4
Tnx to all that asked about the "V"...is has sold!!....73
all.....Mark....K8ML
------------------------------
Date: Tue, 24 Jun 2003 16:25:41 EDT
From: AC5E at aol.com
To: tentec at contesting.com
Subject: Re: [TenTec]Rig tests
Message-ID: <1e1.be08748.2c2a0dc5 at aol.com>
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Message: 5
I have seen so many "highly peculiar" test results over the half century
plus
I have been involved with electronics I really don't trust "objective"
tests.
By the time the test sees print at least some and often all objectivity has
gone by the wayside.
I much prefer to personally take the equipment in question and
compare
it with some standard. You got a hot car? Lets take it to the strip and see
what it will do, side by side with mine. Your car has a superior ride? Lets
run
down the River Road and see how it handles over the potholes and washboards.
Your latest boob toob will record DVD's and play them back in VHS - and it's
got triple wishbone filters to boot! Let's compare the picture on it to my
20
year old Zenith.
You got a super tranciever? Bring it over and put it in place of my second
rig so it's a switch flip away from the antenna and we will compare it to
the
best rig I have been able to find up to now and we will see how it does. Can
we
copy a weak station during the inevitable afternoon thunderstorm? Can pull
out
a weak one from under or between strong stations? How are the filters? Are
the skirts sharp and clean? How is the audio, clean and clear or muddy and
distorted?
While the results are somewhat skewed by local conditions, those conditions
are the ones that any rig in this neighborhood is going to have to perform
under. Weak signals, less than optimum antennas, noisy neighborhood,
crowded
bands, and added interference from the neighbors sewing machine and mixer
and
all.
The comparison continues until all parties are satisfied and agree on
results. And you know, it usually doesn't take long to decide which rig
performs the
best. That's why I have an open shack policy. If you have the latest
"SuperBlaster 9900" and you want to compare it bring it on!
73 Pete Allen AC5e
------------------------------
Date: Tue, 24 Jun 2003 15:29:09 -0500
From: "Keith Lodahl" <lodahlkh at charter.net>
To: <tentec at contesting.com>
Subject: RE: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <003c01c33a8f$44541000$6401a8c0 at den>
In-Reply-To: <3EF89A8A.57225AE6 at earthlink.net>
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Message: 6
I will give you $150.00 and a FT757GX plus pay shipping both ways.
Keith Lodahl
KB9NUM NNN0ACS NNN0GCE ONE
President, Rock River Radio Club
ARRL Official Emergency Station
ARRL Public Information Officer
ARRL Volunteer Examiner
920-387-4675
kb9num at charter.net
> -----Original Message-----
> From: tentec-bounces at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Dave Heil
> Sent: Tuesday, June 24, 2003 1:38 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
>
>
> WD4K wrote:
> >
> > This Orion testing has gone from questionable to absolutely ridiculous.
> > Isn't anyone here going to question statements of personal
> opinion cloaked
> > as fact??
>
> For days now I've been sitting and reading these comparisons and I'm
> beginning to think that I have no idea what makes a good receiver and
> what makes a bad receiver. Over the past twenty or so years I've owned
> Drake ("full Sherwood") C-Lines, TR-7's, the Ten-Tec Paragon and the
> Omni VI (option 3). I've used TS-930's, TS-940's, TS-950's, TS-830's,
> TS-850's, TS-870's, FT-1000D's, FT-1000MP's, FT-1000MP Mk V's, FT-1000MP
> Fields and, oh yes, FT-757's (various incarnations). I've had the Orion
> for about a month-and-a-half. It has been my opinion that it has the
> finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> beginning to think I should sell the piece of crap and buy a second-hand
> FT-757 ;-)
>
> What to do, what to do...
>
> Dave Heil K8MN
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
------------------------------
Date: Tue, 24 Jun 2003 17:09:22 -0400
From: "Mark Rauchfuss" <mark.rauchfuss at worldnet.att.net>
To: <tentec at contesting.com>
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <011401c33a94$e8da5760$d738570c at oemcomputer>
References: <003c01c33a8f$44541000$6401a8c0 at den>
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Message: 7
I'll give $150 and an Eico 753!!!
Mark,
KD7WEO
----- Original Message -----
From: "Keith Lodahl" <lodahlkh at charter.net>
To: <tentec at contesting.com>
Sent: Tuesday, June 24, 2003 4:29 PM
Subject: RE: [TenTec] RE: Topband Digest, Vol 6, Issue 20
> I will give you $150.00 and a FT757GX plus pay shipping both ways.
>
> Keith Lodahl
> KB9NUM NNN0ACS NNN0GCE ONE
> President, Rock River Radio Club
> ARRL Official Emergency Station
> ARRL Public Information Officer
> ARRL Volunteer Examiner
> 920-387-4675
> kb9num at charter.net
>
>
>
> > -----Original Message-----
> > From: tentec-bounces at contesting.com
> > [mailto:tentec-bounces at contesting.com]On Behalf Of Dave Heil
> > Sent: Tuesday, June 24, 2003 1:38 PM
> > To: tentec at contesting.com
> > Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
> >
> >
> > WD4K wrote:
> > >
> > > This Orion testing has gone from questionable to absolutely
ridiculous.
> > > Isn't anyone here going to question statements of personal
> > opinion cloaked
> > > as fact??
> >
> > For days now I've been sitting and reading these comparisons and I'm
> > beginning to think that I have no idea what makes a good receiver and
> > what makes a bad receiver. Over the past twenty or so years I've owned
> > Drake ("full Sherwood") C-Lines, TR-7's, the Ten-Tec Paragon and the
> > Omni VI (option 3). I've used TS-930's, TS-940's, TS-950's, TS-830's,
> > TS-850's, TS-870's, FT-1000D's, FT-1000MP's, FT-1000MP Mk V's, FT-1000MP
> > Fields and, oh yes, FT-757's (various incarnations). I've had the Orion
> > for about a month-and-a-half. It has been my opinion that it has the
> > finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> > beginning to think I should sell the piece of crap and buy a second-hand
> > FT-757 ;-)
> >
> > What to do, what to do...
> >
> > Dave Heil K8MN
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
------------------------------
Date: Tue, 24 Jun 2003 17:22:31 -0500
From: "Dave Kamp, KW0D" <kw0d at netexpress.net>
To: tentec at contesting.com
Subject: Re: [TenTec] Tnx es my 2 cts
Message-ID: <3.0.6.32.20030624172231.01106aa0 at netexpress.net>
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Message: 8
Hee hee... Hi John!
>Dollars to doughnuts, I'll bet both ICOM and Ten-Tec
>have test equipment in their shops that surpass what's available at the
>ARRL.
Hey John- if they send ME an example of each new rig, I'll spend my own
dollars to buy doughnuts, set them new rigs up in my shack, and try them
out on my relatively unsophisticated, but quite satisfactory test equipment.
... Lessee... I've got an antenna connector over there, and a power-supply
under here... and the rotor-control box up there, and a log book right
here... I think I could stage a pretty good test- I'm sure that with
enough time, I could develop a conclusive opinion. It might, however, take
a few years... mebbie ten... before my DXCC... er... test report.... is
complete...
73!
DK :-)
---------------------------------------------------------
73's from KW0D Dave in LeClaire, Iowa
------------------------------
Date: Tue, 24 Jun 2003 18:07:39 -0500
From: Robert & Linda McGraw K4TAX <RMcGraw at Blomand.Net>
To: tentec at contesting.com
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
Message-ID: <006501c33aa5$6871a900$c1b34ace at s0024901093>
References: <003c01c33a8f$44541000$6401a8c0 at den>
<011401c33a94$e8da5760$d738570c at oemcomputer>
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Message: 9
Shucks, I'll give you a Collins 32V2 and a Collins 75A4. Not that's a pair
of horses! I'll pay the shipping on yours to me, you pay the shipping on
mine to you. Heh Heh :)
73
Bob ,K4TAX
----- Original Message -----
From: "Mark Rauchfuss" <mark.rauchfuss at worldnet.att.net>
To: <tentec at contesting.com>
Sent: Tuesday, June 24, 2003 4:09 PM
Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
> I'll give $150 and an Eico 753!!!
>
> Mark,
> KD7WEO
>
>
> ----- Original Message -----
> From: "Keith Lodahl" <lodahlkh at charter.net>
> To: <tentec at contesting.com>
> Sent: Tuesday, June 24, 2003 4:29 PM
> Subject: RE: [TenTec] RE: Topband Digest, Vol 6, Issue 20
>
>
> > I will give you $150.00 and a FT757GX plus pay shipping both ways.
> >
> > Keith Lodahl
> > KB9NUM NNN0ACS NNN0GCE ONE
> > President, Rock River Radio Club
> > ARRL Official Emergency Station
> > ARRL Public Information Officer
> > ARRL Volunteer Examiner
> > 920-387-4675
> > kb9num at charter.net
> >
> >
> >
> > > -----Original Message-----
> > > From: tentec-bounces at contesting.com
> > > [mailto:tentec-bounces at contesting.com]On Behalf Of Dave Heil
> > > Sent: Tuesday, June 24, 2003 1:38 PM
> > > To: tentec at contesting.com
> > > Subject: Re: [TenTec] RE: Topband Digest, Vol 6, Issue 20
> > >
> > >
> > > WD4K wrote:
> > > >
> > > > This Orion testing has gone from questionable to absolutely
> ridiculous.
> > > > Isn't anyone here going to question statements of personal
> > > opinion cloaked
> > > > as fact??
> > >
> > > For days now I've been sitting and reading these comparisons and I'm
> > > beginning to think that I have no idea what makes a good receiver and
> > > what makes a bad receiver. Over the past twenty or so years I've
owned
> > > Drake ("full Sherwood") C-Lines, TR-7's, the Ten-Tec Paragon and the
> > > Omni VI (option 3). I've used TS-930's, TS-940's, TS-950's, TS-830's,
> > > TS-850's, TS-870's, FT-1000D's, FT-1000MP's, FT-1000MP Mk V's,
FT-1000MP
> > > Fields and, oh yes, FT-757's (various incarnations). I've had the
Orion
> > > for about a month-and-a-half. It has been my opinion that it has the
> > > finest receiver I've ever used. Now I'm filled with self-doubt. I'm
> > > beginning to think I should sell the piece of crap and buy a
second-hand
> > > FT-757 ;-)
> > >
> > > What to do, what to do...
> > >
> > > Dave Heil K8MN
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec at contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
------------------------------
Date: Tue, 24 Jun 2003 18:00:34 -0700 (PDT)
From: JOHN <ku3g at yahoo.com>
To: tentec at contesting.com
Subject: [TenTec] omni V
Message-ID: <20030625010034.91857.qmail at web14201.mail.yahoo.com>
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Message: 10
the omni V has been sold , thanks for all the interesting offers
73 john ku3g
---------------------------------
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Date: Tue, 24 Jun 2003 21:42:42 -0400
To: tentec at contesting.com
From: John Rippey <w3uls at 3n.net>
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Subject: [TenTec] Two cents more
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A recent posting on another reflector lists some variables that can affect
A/B transceiver comparisons, and have prompted the following observations.
It probably is a practical impossibility to come up with a valid real-world
ranking of transceivers, given the limited resources of the typical ham.
Time of year, propagation conditions, location, antenna types and
condition, operator skills and preferences, modifications made, all play a
critical role. We are not the U.S. military, for instance, which can spend
hundreds of thousands of dollars on extensive field testing of new
equipment.
The best that can be expected, perhaps, is for each of us to try out
several transceivers over a considerable period of time and see which ones
work best for us. The choices we make may not be consistent with the
choices of other hams, and they may not reflect the numbers and opinions
published by the ARRL or other labs, which are of limited value in any
event. No, our choices of "favorite" transceivers simply represent what
works best over time, at a particular location, for each of us.
A case in point: an article entitled, "Thoughts on Specifications," by
Willem Boss, A Dutchman who tests radios, appeared on the Radio Nederlands
web site some time ago. (Boss' article was published in the 1997 "World
Radio-TV Handbook.") Among the points Boss makes is that "testing receivers
is not as easy as it seems." For one thing, ". . . a receiver review
without practical listening tests isn't much use . . ." but at the same
time ". . . test results based on listening only are subjective and highly
influenced by the antenna type and the local situation where a receiver is
being tested." Boss notes that a reviewer in the U.S. does not face the
"tremendous problems" posed by the extremely high signal levels on the 41
and 49 meter bands that exist in Europe, hence "you can expect a better
handling of strong signals by any receiver outside the European continent."
Boss goes on, "Receiver technology is a complicated field . . . (and) . . .
worldwide only a handful of reviewers have the equipment, the time and the
knowledge to measure receeivers . . ."
So, assuming Boss knows what he's talking about, the A/B comparisons we
make may be fun, but they ain't scientific, and certainly are not
definitive.
73,
John, W3ULS
------------------------------
Date: Tue, 24 Jun 2003 18:54:30 -0700
From: "Rick Williams" <rick.williams at telus.net>
To: "TenTec List \(E-mail\)" <TenTec at contesting.com>
Subject: [TenTec] Omni V & VI MIXER Question
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Message: 11
Far be it from me to deflect discussion from the Orion and nanohertz
accuracy but I have a question related to older technology.
It is my understanding that the Omni V and VI both use the same Synergy
Microwave CMP-A12 mixer. The archives suggest that this is a 17 dBm device
but I have been unable to find detailed specs.
My question is - has anyone experimented with other mixers? The
Mini-Circuits units with useable frequency response (e.g. RAY-3 a 23 dBm
device??) are expensive but look very interesting.
http://www.minicircuits.com/dg03-108.pdf
Anyway - just a thought. Thanks in advance!
73,
Rick
VE7ASR
Web site: http://www3.telus.net/ve7asr
------------------------------
Date: Tue, 24 Jun 2003 20:23:08 -0500
From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj at isunet.net>
To: tentec at contesting.com
Subject: Re: [TenTec] Omni V & VI MIXER Question
Message-ID: <3EF8F97C.6355 at isunet.net>
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Message: 12
23 dBm means 23 dBm LO power. 200 milliwatts. at least the 17 dBm mixer
only needs 50 milliwatts. That would be the biggest problem with using
the higher power mixer. The next problem probably is that the RF and
first IF stage is very close to being the limitation with the 17 dBm
mixer. Then the crystal filters run into problems handling more than
that much signal.
It may be that the 17 dBm mixer could handle 20 or 21 dBm local
oscillator power with improved signal handling characteristics. That's
often true of lower power MCL mixers.
73, Jerry, K0CQ
--
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.
------------------------------
Date: Tue, 24 Jun 2003 21:42:38 -0500
From: "John" <jlockj at earthlink.net>
To: <geraldj at isunet.net>, <tentec at contesting.com>
Subject: Re: [TenTec] Omni V & VI MIXER Question
Message-ID: <00cd01c33ac3$76902de0$7143fea9 at p400>
References: <000001c33abc$b84db970$0d40b440 at ricksjunk>
<3EF8F97C.6355 at isunet.net>
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Message: 13
Hi Jerry,
I've had problems with the Omni VI mixer (and a replacement) getting so hot
in the stock circuit that it became microphonic, necessitating backing off
the RF gain to prevent ringing. Others have reported this too. No problem
with the covers off! ; )
I wouldn't recommend increasing the L.O. power level without installing
louvers or a fan for the lower chassis.
73,
John W0DC
---- Original Message -----
From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj at isunet.net>
To: <tentec at contesting.com>
Sent: Tuesday, June 24, 2003 8:23 PM
Subject: Re: [TenTec] Omni V & VI MIXER Question
> 23 dBm means 23 dBm LO power. 200 milliwatts. at least the 17 dBm mixer
> only needs 50 milliwatts. That would be the biggest problem with using
> the higher power mixer. The next problem probably is that the RF and
> first IF stage is very close to being the limitation with the 17 dBm
> mixer. Then the crystal filters run into problems handling more than
> that much signal.
>
> It may be that the 17 dBm mixer could handle 20 or 21 dBm local
> oscillator power with improved signal handling characteristics. That's
> often true of lower power MCL mixers.
>
> 73, Jerry, K0CQ
> --
> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
------------------------------
Date: Tue, 24 Jun 2003 21:49:29 -0500
From: "John T. Fleming" <W3GQJ at attbi.com>
To: <tentec at contesting.com>
Subject: [TenTec] RX320D Digital IF out
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Message: 14
Hello,
=20
I understand that the 12KHz digital IF is available on the back of the
RX320D through a miniature stereo phone connector. I want to add a
connector to my Jupiter to send the IF to the sound card. I assume that =
the
signal is connected to the "tip" and the guessing that the "ground" is
connected to the "ring" to avoid a ground loop. Would someone confirm =
my
assumptions? The digital IF is available from JU7 pin7 on the RF board =
(RX
OUT). There is an empty RCA phono jack, but I would like to make mine
compatible with someone using an RX320D. Thank you.
=20
73,
John
W3GQJ at arrl.net
W3GQJ at attbi.com
<\
----- \ 0 _
----------- _\\/\-%
______(_)=3D=3D=3D(_)____
=20
------------------------------
Date: Mon, 23 Jun 2003 10:28:38 -0700
From: "Kevin J. Rowett" <krowett at rowett.org>
To: <tentec at contesting.com>
Subject: RE: [TenTec] GPS Antenna feedline
Message-ID: <001801c339ac$e29af4b0$2800000a at N6RCELaptop>
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Message: 15
GPS "civil" frequency is 1.536 Ghz - the received signal, after
path loss is about -134dBm. 100 feet of RG/58 has about 20dB of
loss - about the most the best GPS receivers can tolerate.
Connectors and adaptors also have about 3dB insertion loss as well.
You can get get up to about 350 feet with a nice low loss cable such
as 9913.
N6RCE
-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Mark Erbaugh
Sent: Monday, June 23, 2003 9:50 AM
To: tentec at contesting.com
Subject: [TenTec] GPS Antenna feedline
I received my HP Z3801 last week. To keep things on topic, the intent is to
use it as an external reference for my RX340.
I mounted the antenna over the edge of my garage roof. That was the easiest
place to get a good view of the sky. If I try to get closer to the shack, I
will have to find someone to climb on my two story roof. The supplied lead
in barely made it to the ground. I took the clock outside and hooked it up
directly to the end of the antenna. Using my laptop, I verified that all was
good. It was able to track 5 or 6 satellites and successfully completed the
survey operation (took about 3 hours).
However, I really want to install the clock in the shack. That's going to
take another 30 - 35 feet of cable. I took some spare coax jumpers and
adapters and brought the signal into the shack, but the clock wasn't able to
receive any satellites. I suspect that with all the adapters more coax than
the minimum length, I just had too much attenuation. Also, I had checked the
jumpers out for HF or 2m operation (RG-58).
Here was the arrangement
supplied lead in cable terminating in BNC - BNC / PL259 adapter - SO239
barrell connnector - 50 - 60 feet of RG58 with PL259 fittings on each end -
SO239 bulkhead fitting (to go through wall) - 25 feet of RG58 with PL259 on
one end and BNC on the other - BNC to N adapter (supplied w/ antenna ) -
clock..
Anyways, my question, what's the best way to go about extending the GPS
antenna. Since we are talking about 35 feet, I'm not adverse to buying some
more expensive coax to reduce line loss. I'll also go directly through the
wall with coax and skip the bulkhead fitting. I'd also put the N fitting
directly on the clock end of the cable. For connecting to the existing
antenna, should I cut of the existing BNC and directly splice the new
feedline (and how would that be done?), or would it be better to try and
install a matching BNC fitting and connect to the BNC already there?
Or is this a lost cause and do I need to figure out to get the antenna
closer to the shack?
73,
Mark
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End of TenTec Digest, Vol 6, Issue 62
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