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CX2SA > SATDIG 24.01.18 15:41l 768 Lines 26894 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Exciting Coax (Greg D)
2. Re: Exciting Coax (Alan)
3. Re: Exciting Coax (Bob- W7LRD)
4. Re: Exciting Coax (Burns Fisher)
5. Keps accuracy (Dale Kubichek)
6. Re: Exciting Coax (anderson58625)
7. Re: Exciting Coax (Alan)
8. Re: Exciting Coax (jim@?????.????
9. senior moment (Bob- W7LRD)
10. Re: Exciting Coax (Edward R Cole)
11. Re: senior moment (M5AKA)
----------------------------------------------------------------------
Message: 1
Date: Tue, 23 Jan 2018 13:03:06 -0800
From: Greg D <ko6th.greg@?????.???>
To: Glenn Miller - AA5PK <aa5pk@??????????.???>
Cc: AMSAT BBS <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <c5d2a1fc-cc0b-5e49-2bd5-ae208bdb82c3@?????.???>
Content-Type: text/plain; charset=ISO-8859-1
Yes, but wet 9913 has a loss of ?
While searching for some hardline to replace my 9913 run some years ago,
I resorted to drilling a hole in the bottom end of the cable, and
sucking out the water periodically with a syringe. It was not an
insignificant amount, and made a huge difference. Eventually found
someone with some leftover LDF4-50A hardline, and made a swap with him
for a UHF beam antenna I had extra. Best deal on the planet.
If you can truly keep your 9913 dry inside, by all means, go for it.
But how do you know it's still dry? To me, it's not worth the trouble.
If you like that size cable, I'd go with LMR-400 instead of either
variety of 9913.
Greg KO6TH
Glenn Miller - AA5PK wrote:
> 9913F7 has nearly 10 dB attenuation/100 feet at 400 MHz. 9913 has
> about 2.6 dB.
>
> https://edesk.belden.com/products/techdata/metric/pdf/9913F7.pdf
> https://catalog.belden.com/techdata/EN/9913_techdata.pdf
>
> I know which I'd choose.
>
> -----Original Message----- From: Norm n3ykf Sent: Tuesday, January 23,
> 2018 1:09 PM To: Greg D Cc: <, amsat-bb@?????.??????? ;
> anderson58625 Subject: Re: [amsat-bb] Exciting Coax
> 9913 is not 9913F7
>
> Google is your friend, or perhaps if one is lazy, not.
>
> Norm n3ykf
>
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed
> are solely those of the author, and do not reflect the official views
> of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Tue, 23 Jan 2018 15:03:08 -0600
From: "Alan" <wa4sca@?????.???>
To: "'Glenn Miller - AA5PK'" <aa5pk@??????????.???>, "'AMSAT BBS'"
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <000b01d3948d$9271fdc0$b755f940$@?????.???>
Content-Type: text/plain; charset="us-ascii"
The first link is for dB per 100 meters. The second link is for dB per 100
feet, and gives 2.6 dB. nominal.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Glenn
<Miller - AA5PK
<Sent: Tuesday, January 23, 2018 14:36 PM
<To: AMSAT BBS <amsat-bb@?????.???>
<Subject: Re: [amsat-bb] Exciting Coax
<
<9913F7 has nearly 10 dB attenuation/100 feet at 400 MHz. 9913 has about
2.6
<dB.
<
<https://edesk.belden.com/products/techdata/metric/pdf/9913F7.pdf
<https://catalog.belden.com/techdata/EN/9913_techdata.pdf
<
<I know which I'd choose.
<
<-----Original Message-----
<From: Norm n3ykf
<Sent: Tuesday, January 23, 2018 1:09 PM
<To: Greg D
<Cc: <, amsat-bb@?????.??????? ; anderson58625
<Subject: Re: [amsat-bb] Exciting Coax
<
<9913 is not 9913F7
<
<Google is your friend, or perhaps if one is lazy, not.
<
<Norm n3ykf
<
<Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
<_______________________________________________
<Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
<to all interested persons worldwide without requiring membership. Opinions
<expressed
<are solely those of the author, and do not reflect the official views of
AMSAT-
<NA.
<Not an AMSAT-NA member? Join now to support the amateur satellite
<program!
<Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Tue, 23 Jan 2018 13:35:58 -0800 (PST)
From: Bob- W7LRD <w7lrd@???????.???>
To: Glenn Miller - AA5PK <aa5pk@??????????.???>, Greg D
<ko6th.greg@?????.???>
Cc: AMSAT BBS <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <394188853.575366.1516743359153@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
Some years ago I had some 9913, well sealed (so I thought). Gradually the
swr crept up. Without a thought, it got trashed and was replaced with LMR
400. Yes the idea of syringing water out of 9913 can work, also a constant
blower blowing into the 9913 can work, we can also insert small sponges into
the 9913 and replace them when necessary, or we can have the 9913 running
down hill the whole way so the water can drip out (makes for a wet ham
shack), or we can build a roof over the 9913 to keep it out of the moisture.
I could go on and on and I am sure many of you have even more creative
ideas! Am I being facetious? Of course I am! Hams can be "cheap" bunch
but there is place where a few extra bucks is money well spent. Anything
above 70cm I use LMR600. Just having fun today!
73 Bob W7LRD
> On January 23, 2018 at 1:03 PM Greg D wrote:
>
>
> Yes, but wet 9913 has a loss of ?
>
> While searching for some hardline to replace my 9913 run some years ago,
> I resorted to drilling a hole in the bottom end of the cable, and
> sucking out the water periodically with a syringe. It was not an
> insignificant amount, and made a huge difference. Eventually found
> someone with some leftover LDF4-50A hardline, and made a swap with him
> for a UHF beam antenna I had extra. Best deal on the planet.
>
> If you can truly keep your 9913 dry inside, by all means, go for it.
> But how do you know it's still dry? To me, it's not worth the trouble.
> If you like that size cable, I'd go with LMR-400 instead of either
> variety of 9913.
>
> Greg KO6TH
>
>
> Glenn Miller - AA5PK wrote:
>
> > > 9913F7 has nearly 10 dB attenuation/100 feet at 400 MHz. 9913
has
> > about 2.6 dB.
> >
> > https://edesk.belden.com/products/techdata/metric/pdf/9913F7.pdf
> > https://catalog.belden.com/techdata/EN/9913_techdata.pdf
> >
> > I know which I'd choose.
> >
> > -----Original Message----- From: Norm n3ykf Sent: Tuesday,
January 23,
> > 2018 1:09 PM To: Greg D Cc: <, amsat-bb@?????.???
mailto:amsat-bb@?????.??? >, ;
> > anderson58625 Subject: Re: [amsat-bb] Exciting Coax
> > 9913 is not 9913F7
> >
> > Google is your friend, or perhaps if one is lazy, not.
> >
> > Norm n3ykf
> >
> > Subscription settings:
http://www.amsat.org/mailman/listinfo/amsat-bb
> > _______________________________________________
> > Sent via AMSAT-BB@?????.??? mailto:AMSAT-BB@?????.??? . AMSAT-NA
makes this open forum available
> > to all interested persons worldwide without requiring membership.
> > Opinions expressed
> > are solely those of the author, and do not reflect the official
views
> > of AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> > program!
> > Subscription settings:
http://www.amsat.org/mailman/listinfo/amsat-bb
> >
> > > _______________________________________________
> Sent via AMSAT-BB@?????.??? mailto:AMSAT-BB@?????.??? . AMSAT-NA makes
this open forum available
> to all interested persons worldwide without requiring membership.
Opinions expressed
> are solely those of the author, and do not reflect the official views
of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Tue, 23 Jan 2018 17:00:28 -0500
From: Burns Fisher <burns@??????.??>
To: Bob- W7LRD <w7lrd@???????.???>
Cc: AMSAT BBS <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID:
<CABX7KxU6neKO2FLi7KHs0bD+Qjz6PHz98_FSS4mw01cHNx-2AQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
You know how the phone company used to keep paper-insulate thousand (or
whatever) conductor, lead sheath cables dry inside? Dry nitrogen pumped in
from the central office, and extra bottles soldered in when leaks were
found :-)
On Tue, Jan 23, 2018 at 4:35 PM, Bob- W7LRD <w7lrd@???????.???> wrote:
> Some years ago I had some 9913, well sealed (so I thought). Gradually the
> swr crept up. Without a thought, it got trashed and was replaced with LMR
> 400. Yes the idea of syringing water out of 9913 can work, also a constant
> blower blowing into the 9913 can work, we can also insert small sponges
> into the 9913 and replace them when necessary, or we can have the 9913
> running down hill the whole way so the water can drip out (makes for a wet
> ham shack), or we can build a roof over the 9913 to keep it out of the
> moisture. I could go on and on and I am sure many of you have even more
> creative ideas! Am I being facetious? Of course I am! Hams can be
> "cheap" bunch but there is place where a few extra bucks is money well
> spent. Anything above 70cm I use LMR600. Just having fun today!
>
> 73 Bob W7LRD
>
> > On January 23, 2018 at 1:03 PM Greg D wrote:
> >
> >
> > Yes, but wet 9913 has a loss of ?
> >
> > While searching for some hardline to replace my 9913 run some years
> ago,
> > I resorted to drilling a hole in the bottom end of the cable, and
> > sucking out the water periodically with a syringe. It was not an
> > insignificant amount, and made a huge difference. Eventually found
> > someone with some leftover LDF4-50A hardline, and made a swap with
> him
> > for a UHF beam antenna I had extra. Best deal on the planet.
> >
> > If you can truly keep your 9913 dry inside, by all means, go for it.
> > But how do you know it's still dry? To me, it's not worth the
> trouble.
> > If you like that size cable, I'd go with LMR-400 instead of either
> > variety of 9913.
> >
> > Greg KO6TH
> >
> >
> > Glenn Miller - AA5PK wrote:
> >
> > > > 9913F7 has nearly 10 dB attenuation/100 feet at 400 MHz.
> 9913 has
> > > about 2.6 dB.
> > >
> > > https://edesk.belden.com/products/techdata/metric/pdf/
> 9913F7.pdf
> > > https://catalog.belden.com/techdata/EN/9913_techdata.pdf
> > >
> > > I know which I'd choose.
> > >
> > > -----Original Message----- From: Norm n3ykf Sent: Tuesday,
> January 23,
> > > 2018 1:09 PM To: Greg D Cc: <, amsat-bb@?????.??? mailto:
> amsat-bb@?????.??? >, ;
> > > anderson58625 Subject: Re: [amsat-bb] Exciting Coax
> > > 9913 is not 9913F7
> > >
> > > Google is your friend, or perhaps if one is lazy, not.
> > >
> > > Norm n3ykf
> > >
> > > Subscription settings: http://www.amsat.org/mailman/
> listinfo/amsat-bb
> > > _______________________________________________
> > > Sent via AMSAT-BB@?????.??? mailto:AMSAT-BB@?????.??? .
> AMSAT-NA makes this open forum available
> > > to all interested persons worldwide without requiring
> membership.
> > > Opinions expressed
> > > are solely those of the author, and do not reflect the
> official views
> > > of AMSAT-NA.
> > > Not an AMSAT-NA member? Join now to support the amateur
> satellite
> > > program!
> > > Subscription settings: http://www.amsat.org/mailman/
> listinfo/amsat-bb
> > >
> > > > _______________________________________________
> > Sent via AMSAT-BB@?????.??? mailto:AMSAT-BB@?????.??? . AMSAT-NA
> makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions expressed
> > are solely those of the author, and do not reflect the official
> views of AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/
> listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 5
Date: Tue, 23 Jan 2018 22:10:47 +0000 (UTC)
From: Dale Kubichek <n6jsx@?????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Cc: "ham-sats@???????????.???? <ham-sats@???????????.???>
Subject: [amsat-bb] Keps accuracy
Message-ID: <38222583.646531.1516745447189@????.?????.???>
Content-Type: text/plain; charset=UTF-8
I see all these (hard to follow) AMSAT-BB postings about Keps implying there
is NO ONE site that has accurate Keps. That we need to get this from here or
that from there and combine to make a KEP.TLE for our programs.
Is there no HAM SAT Keps that are complete & accurate?
I was under the impression the AMSAT Keps were the most accurate for HAM
SATs? Is that true or not, and if not, WHY???
AMSAT Keps - when are they updated? If daily - what time?
How often should Users update their program Keps?
I
Dale Kubichek, MS-EET, N6JSX
http://groups.yahoo.com/group/HAM-SATs
http://groups.yahoo.com/group/RDF-USA
------------------------------
Message: 6
Date: Tue, 23 Jan 2018 16:26:45 -0600
From: "anderson58625" <anderson58625@?????.???>
To: "'Greg D'" <ko6th.greg@?????.???>
Cc: 'Amsat BB' <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <019f01d39499$41369680$c3a3c380$@?????.???>
Content-Type: text/plain; charset="us-ascii"
Thanks Greg, Norm, Diane, WF1F, and Bob for the effort of your kind answers!
73
Mark W9AT
-----Original Message-----
From: Greg D [mailto:ko6th.greg@?????.????
Sent: Tuesday, January 23, 2018 2:52 PM
To: Norm n3ykf
Cc: Bob- W7LRD; anderson58625; Amsat BB
Subject: Re: [amsat-bb] Exciting Coax
Ok, fair enough. F7 is different than the original 9913, and that is an
important distinction. Bob's comment (which I quoted) was about the
original 9913. The F7 variety shouldn't be as susceptible to water, but
then it also isn't quite as good as (dry) 9913 or LMR-400.
But to the original question, which included a point about covering
microwave bands, none of the RG-8-ish type cables are appropriate for more
than a few feet on those bands. Except for the short flexible portion
around the rotor, LMR-600 or hardline is needed, or mount a weather proof
transverter up on the tower to shorten the microwave portion of the feed. I
still use a higher-grade cable for UHF, as my run is over 60' from rig to
antenna. Below that, it's more a matter of availability and cost. Just
don't go with the really skinny stuff
(RG-58 or RG-8X), because of both higher loss and lower power handling
capability.
A good comparison table I found is here:
https://mapleleafcom.com/PDFs_Downloads/CoaxLossChart.pdf
Greg KO6TH
Norm n3ykf wrote:
> 9913 is not 9913F7
>
> Google is your friend, or perhaps if one is lazy, not.
>
> Norm n3ykf
>
> On Tue, Jan 23, 2018 at 12:33 PM, Greg D <ko6th.greg@?????.???> wrote:
>> I've got hardline for my 60' runs on 70cm, and 1.2 ghz. Really works
>> a LOT better than 9913, especially with the water problems. Besides
>> at the connectors, the local squirrel population likes to gnaw at
>> stuff, and all it takes is one small chew to ruin the entire run.
>> With "regular" (solid innards) coax, the wound can be taped over with
>> electrical tape, since they don't seem to like the braid. Even the
>> smallest nick in 9913 will eventually be fatal.
>>
>> Greg KO6TH
>>
>>
>> Bob- W7LRD wrote:
>>> For 2 & 70cm I use LMR400. LMR is better (in my opinion), in that it's
more flexable, 9913 can get water inside. Unless coax connectors are super
sealed.
>>> 73 Bob W7LRD
>>>
>>>> On January 22, 2018 at 6:03 PM anderson58625 <anderson58625@?????.???>
wrote:
>>>>
>>>>
>>>> Reading the subject line, I may have somehow mixed sarcasm with a
>>>> potential pun (eye of the beholder!) <grin>. Sorry for that.
>>>>
>>>>
>>>>
>>>> I seek to avoid investing in a set of cable producing hardware (or
>>>> assembled
>>>> cables) which I will regret later. I am hoping to get some
>>>> guidance regarding coax for:
>>>>
>>>> 1) IF patch between equipment (male-male BNC's)
>>>>
>>>> 2) 2m feedline (N-connectors) (<50')
>>>>
>>>> 3) 70cm feedline (N-connectors) (<50')
>>>>
>>>> 4) A later potential for feedline carrying microwave frequencies
>>>> (>1GHz)
>>>>
>>>>
>>>>
>>>> The frequency & loss-rate charts for coax are informative, but I'm
>>>> not sure I'm seeing which connectors will fit what cable
>>>> brand/types. With the variables of loss, dimensions, flexibility,
>>>> and potential proprietary crimping systems, etc., I don't have
>>>> enough experience or information to confidently make an online
>>>> materials order. Things were much easier down here with just HF
>>>> frequencies, RG-213, and good quality (weather protected) PL-259's!
>>>> <grin>
>>>>
>>>>
>>>>
>>>> For IF patch cables, I figure these are conveying HF so the cable
>>>> type/loss at 1-3' isn't very important. But, there is also
>>>> shielding: A consideration?
>>>>
>>>> . Any thoughts on IF cables?
>>>>
>>>> . Plus, I've never attached a BNC to a cable. Easy? Avoid it?
>>>>
>>>> . Plan on a new crimper/die?
>>>>
>>>> . Or, if premade would be cheaper (just a few IF patch cables),
any
>>>> quality sources to recommend?
>>>>
>>>>
>>>>
>>>> For the 2m & 70cm feedlines, I know flexibility may be a
>>>> consideration on rotating/elevating masts. Of course, I'm sure a
>>>> rigid feedline may be superior elsewhere, but I am not at that
>>>> point yet. Still, advice on that subject is gratefully
>>>> appreciated. I need to provide good questions to hope for good
answers, so what feedline you would recommend for:
>>>>
>>>> . Reasonable flexibility/portability
>>>>
>>>> . 2m-23cm
>>>>
>>>> . Modest power
>>>>
>>>> . <50'
>>>>
>>>> . For use with n-connectors
>>>>
>>>>
>>>>
>>>> The benefit of you knowledge and experience is much appreciated.
>>>>
>>>>
>>>>
>>>> 73
>>>>
>>>>
>>>>
>>>> Mark W9AT
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum
>>>> available to all interested persons worldwide without requiring
>>>> membership. Opinions expressed are solely those of the author, and do
not reflect the official views of AMSAT-NA.
>>>> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
>>>> Subscription settings:
>>>> http://www.amsat.org/mailman/listinfo/amsat-bb
>>> _______________________________________________
>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum
>>> available to all interested persons worldwide without requiring
>>> membership. Opinions expressed are solely those of the author, and do
not reflect the official views of AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
>>> Subscription settings:
>>> http://www.amsat.org/mailman/listinfo/amsat-bb
>> _______________________________________________
>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
>> Opinions expressed are solely those of the author, and do not reflect the
official views of AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Tue, 23 Jan 2018 16:49:57 -0600
From: "Alan" <wa4sca@?????.???>
To: "'AMSAT BBS'" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <000001d3949c$7e67feb0$7b37fc10$@?????.???>
Content-Type: text/plain; charset="us-ascii"
No question, the original 9913 could be a water hose. It had an air gap
between the center conductor and the foam dielectric with a spiral winding
of Teflon (?) to keep the spacing constant. A friend and operator of a
repeater went up to determine why the performance was deteriorating. He
found water running out of the feedline into the utility building. My first
satellite station, circa 1986, used 9913 to the preamps at the tower, and
then RG-213 (later LMR-400UF) to the antennas. I put some additional
sealing at the preamps, and never had a problem with water. Perhaps I was
lucky; I certainly was not good. :)
However, 9913 has evolved over the last 30 years in all versions. After my
tower and antennas were destroyed, I rebuilt the system using LMR to the
preamps, and hardline for the 24 cm feed. I had never been satisfied with
the actual flexibility of the 400UF. 9913F7 is the loss equivalent and far
more flexible. It lacks the air gap of the original, so no water. With
some trepidation, I ordered some for the "rotator loop." After 5 years,
based on performance and loss measurements, they are as good as new.
FWIW,
Alan
WA4SCA
------------------------------
Message: 8
Date: Tue, 23 Jan 2018 14:54:25 -0800 (PST)
From: "jim@?????.???? <jim@?????.???>
To: "AMSAT BB" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <1516748065.361727563@????.?????????.???>
Content-Type: text/plain; charset="UTF-8"
Greg D said (in part):
> Yes, but wet 9913 has a loss of ?
I'm not sure any of us can count that high!
Many years ago I had some 9913 on my satellite antennas. After a while I
found that the 430 yagi was getting very deaf listening to mode V/U birds.
Found the cable full of water. Because my cables made a 180 degree sweeping
bend just before entering the house, I ended up drilling a small in the
outer jacket and braid right at the bottom of the bend. Drained over a pint
of water out of the coax. This was on a run that was less than 25 feet
long, and both ends were at weather protected locations. Left it that way
for at least a year before replacing the cable with LMR400.
73
-----
Jim Walls - K6CCC
jim@?????.???
------------------------------
Message: 9
Date: Tue, 23 Jan 2018 16:45:32 -0800 (PST)
From: Bob- W7LRD <w7lrd@???????.???>
To: amsat-bb <amsat-bb@?????.???>
Subject: [amsat-bb] senior moment
Message-ID: <394080228.580179.1516754732576@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
I forget how to get into the keps file in satpc32. I have Win 10-
from the digitally challenged
73 Bob W7LRD
------------------------------
Message: 10
Date: Tue, 23 Jan 2018 16:28:44 -0900
From: Edward R Cole <kl7uw@?????????.???>
To: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <201801240128.w0O1Sjhi031583@?????????.???????????.???>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Bob,
Important to point out that the F7 variant of 9913 has no air
dielectric which got the original 9913 into trouble. Also LMR cables
use aluminum foil shield covered with wire braid shield. If exposed
to water the aluminum corrodes and gets quite lossy. So wx sealing
is still necessary (two wraps of good electrical tape at
minimum). Good electrical tape = Scotch 33+
I also seal with heat shrink tubing but often cover that with electrical tape.
LMR-400 is generally good to 432. It is not anymore flexible than
Belden 9913. For better flex consider LMR-400UF
(ultra-flex). Slightly higher loss but better to go around az-el joints.
For long runs at 432-MHz one should consider LDF4-50 Heliax hardline
(1/2-inch) or lLDF5-50 up to LDF7-50. Loss is higher at 1268. I
have 15-foot run of LDF4-50 from my tower-mounted DEMI 144/1268 Tx
converter. That gets the most power to the antenna and only needs
12vdc, PTT, and 144-MHz coax to input.
Some archive photos: http://www.kl7uw.com/sat.htm
Drawing shows current satellite antenna installation.
73, Ed - KL7uW
From: Bob- W7LRD <w7lrd@???????.???>
To: amsat-bb@?????.???? anderson58625 <anderson58625@?????.???>
Subject: Re: [amsat-bb] Exciting Coax
Message-ID: <992329878.579633.1516693575413@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
For 2 & 70cm I use LMR400. LMR is better (in my opinion), in that
it's more flexable, 9913 can get water inside. Unless coax
connectors are super sealed.
73 Bob W7LRD
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubususa@?????.???
------------------------------
Message: 11
Date: Wed, 24 Jan 2018 13:29:43 +0000 (UTC)
From: M5AKA <m5aka@?????.??.??>
To: amsat-bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] senior moment
Message-ID: <1536054038.7121234.1516800583053@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Adding new satellites to #SatPC32, Gpredict and Nova
https://amsat-uk.org/2013/11/23/adding-new-satellites-to-satpc32/
Trevor M5AKA
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On Wednesday, 24 January 2018, 0:47, Bob- W7LRD <w7lrd@???????.???> wrote:
I forget how to get into the keps file in satpc32.? I have Win 10-
from the digitally challenged
73 Bob W7LRD
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Subject: Digest Footer
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Sent via amsat-bb@?????.???.
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without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
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End of AMSAT-BB Digest, Vol 13, Issue 37
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