Thursday, March 05, 2009 4:05 PM
Subject: Re: [time-nuts] GPS antenna installation problem
> Another, maybe the original tape, was called 100 Miles per Hour Tape
> and was sold years after fabric
> covered aircraft wings went out of style as it was so universally
> useful.
> As the
2009/3/5 Neville Michie :
> PS. I have a type 36 post office clock running and it has a
> synchronising relay that forces the phase
> of the 30 second output pulses to the nearest 2 seconds, by rotating
> the count wheel which has a cardioid cam.
> At a fixed time every day this relay was energise
gt; Mike
>
>
>> -Original Message-
>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
> On
>> Behalf Of Stan W1LE
>> Sent: Wednesday, March 04, 2009 1:36 PM
>> To: Discussion of precise time and frequency measurement
>> Subject:
behind
when removed, if not left on too long.
Mike
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
On
> Behalf Of Stan W1LE
> Sent: Wednesday, March 04, 2009 1:36 PM
> To: Discussion of precise time and frequency measurement
>
In message <48e1c1775b054c2e9d30e7782a40a...@cyrus>, "Bill Hawkins" writes:
>Several people said 20 feet unsupported was too long, but I'm not gonna
>fill a 10 foot, 6 inch diameter pipe with foam. I'll get some light
>chain [...]
Over here you can buy a clothes-line which is actually a nylon cov
In message <49aef43d.3010...@verizon.net>, Stan W1LE writes:
>Actually it is "duct" tape.
No it is not.
Duct tape is made to stay stuck and tight on ventilation ducts in
a wide range of temperatures and humidities, it is not meant to
come off again, ever, and if you try, it will leave a sticky
I know. Did you read my post?
-Chuck Harris
Stan W1LE wrote:
> Actually it is "duct" tape.
>
> Used to air seal the metal joints in a metal duct work system for heat
> and AC.
>
> New building codes require a mastic paint be applied over all metal
> joints in the duct work system.
> I guess
Actually it is "duct" tape.
Used to air seal the metal joints in a metal duct work system for heat
and AC.
New building codes require a mastic paint be applied over all metal
joints in the duct work system.
I guess it is an energy conservation issue, so the processed air does
not leak into un
Bill Hawkins wrote:
...
> Speaking of conversions, I grew up (since 1938) with movie credits that
> mentioned the Gaffer (head electrician). Last year I mentored students
> building a robot for a FIRST Robotics competition. The carpet on the
> field would be marked with red, black, and white gaffer
Group,
Looks like this subject has ended, so I'll summarize:
Bruce Griffiths said the plastic has 12X the expansion coefficient of
copper, so cold alone shouldn't have pulled the center pin. Now I wonder
if the cold contraction pushed the insulation along the core wire and
then pulled the pin whe
In message: <49ac1f99.7010...@rubidium.dyndns.org>
Magnus Danielson writes:
: Steve Rooke skrev:
: > 2009/3/2 Magnus Danielson :
: >> Steve Rooke skrev:
: >>> Gaffa tape the cable to the supporting pipe with a small drip loop
: >>> into the connector.
: >> No. The glue of Gaffa tape ag
Tom,
The standard configuration for our local moutain top cell sites in
Fairbanks is a VIC-100 antenna with LMR-400 feed cable to minimize
RF attenuation at very low temperatures. A Symmetricom 4-port
splitter feeds dual sets of redundant timing equipment. The ATT
guys tell me that even at -60F th
Hal,
Hal Murray skrev:
>> Gaffa tape the cable to the supporting pipe with a small drip loop
>> into the connector.
>
> That assumes the cable gets to the outside of the pipe. I was interested in
> the case where the antenna sits directly on the top of the pipe (not a
> bracket off to the side
tighten the cable ties.
- Original Message
From: Magnus Danielson
To: Discussion of precise time and frequency measurement
Sent: Monday, March 2, 2009 10:04:09 AM
Subject: Re: [time-nuts] GPS antenna installation problem
Steve Rooke skrev:
> 2009/3/2 Magnus Danielson :
>> St
Steve Rooke skrev:
> 2009/3/2 Magnus Danielson :
>> Steve Rooke skrev:
>>> Gaffa tape the cable to the supporting pipe with a small drip loop
>>> into the connector.
>> No. The glue of Gaffa tape ages. Also, it is not very nice to the cable.
>
> Buy decent gaffa tape, not the duct tape variant :)
> Quote:
>
> Some antennas are setup with the coax connector on the inside of a place with
>>> threads where the pipe attaches. The coax has to go up the inside of the
>>> mounting pipe.
>
Comscope do a stainless steel grip for this purpose, Its quite normal to
hang LDF4-50 5-50 etc inside
quency measurement
Sent: Monday, March 2, 2009 8:27:03 AM
Subject: Re: [time-nuts] GPS antenna installation problem
Just as a followup, here's some other ideas:
When I worked for British Telecom (it was called Post Office
Telephones then) as an apprentice I woked on undergroud work for a
while
Just as a followup, here's some other ideas:
When I worked for British Telecom (it was called Post Office
Telephones then) as an apprentice I woked on undergroud work for a
while. Telephone cables were lead sheathed and the joints were made in
a shoth lenght of large diameter lead pipe. A lot of t
2009/3/2 Hal Murray :
>
>> Gaffa tape the cable to the supporting pipe with a small drip loop
>> into the connector.
>
> That assumes the cable gets to the outside of the pipe. I was interested in
> the case where the antenna sits directly on the top of the pipe (not a
> bracket off to the side).
hink it is what gives the system a bad
name in some quarters.
Alan G3NYK.
- Original Message -
From: "Hal Murray"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, March 01, 2009 11:50 PM
Subject: Re: [time-nuts] GPS antenna installation probl
> Gaffa tape the cable to the supporting pipe with a small drip loop
> into the connector.
That assumes the cable gets to the outside of the pipe. I was interested in
the case where the antenna sits directly on the top of the pipe (not a
bracket off to the side).
Some antennas are setup with
2009/3/2 Magnus Danielson :
> Steve Rooke skrev:
>> Gaffa tape the cable to the supporting pipe with a small drip loop
>> into the connector.
>
> No. The glue of Gaffa tape ages. Also, it is not very nice to the cable.
Buy decent gaffa tape, not the duct tape variant :)
Sorry, I agree with you re
Steve Rooke skrev:
> Gaffa tape the cable to the supporting pipe with a small drip loop
> into the connector.
No. The glue of Gaffa tape ages. Also, it is not very nice to the cable.
Gaffa should not be used for permanent installations. For temporary
installations I prefer using a strap (no the
; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] GPS antenna installation problem
Gaffa tape the cable to the supporting pipe with a small drip loop
into the connector.
2009/3/2 Richard W. Solomon :
> One reason why I prefer crimp-on connectors.
>
> 73, Di
Your chinese finger trap supports are available at any reasonably sized
electrical supply house.
Don
- Original Message -
From: "Hal Murray"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, March 01, 2009 6:15 PM
Subject: Re: [ti
gt;To: Discussion of precise time and frequency measurement
>>Subject: Re: [time-nuts] GPS antenna installation problem
>>
>>a couple of suggestions:
>>
>>1. Use a captive center pin on the N male connector.
>>for example, Kings Electronics Inc. N male, model #
One reason why I prefer crimp-on connectors.
73, Dick, W1KSZ
-Original Message-
>From: Stan W1LE
>Sent: Mar 1, 2009 8:56 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] GPS antenna installation problem
>
>a couple of sugges
From: Hal Murray
To: Discussion of precise time and frequency measurement
Sent: Sunday, March 1, 2009 7:15:02 PM
Subject: Re: [time-nuts] GPS antenna installation problem
Pipe / mast , the idea was to allow the feed line to exit the mast and be
supported
How about something like these cable grips?
http://www.deltaelectricproducts.com/
(This is just an example to show what I'm talking about. I'm sure a
local electrical supplier has them.)
You'd have to figure out the cable routing and attachment, but it should
take the strain off the connector
a couple of suggestions:
1. Use a captive center pin on the N male connector.
for example, Kings Electronics Inc. N male, model # KN-59-176 for RG-214
coaxial cable,
center pin is solder type and captive, will not move axially. Wrench
clamp on the shield.
Kings cage = 91836
mil spec: M3901
> Two or one tee connectors will allow the cable to exit and reenter. If
> your side arm is using a elbow now replace it with a tee.
Thanks, but I don't picture what you are trying to describe.
Are you talking about tees and elbows in the pipe or cable?
I was thinking of the simple case with o
Subject: Re: [time-nuts] GPS antenna installation problem
> Take the cable down and remake it, add strain relief, and all will
> probably be well.
Is there a standard trick for how to do the strain relief when the antenna is
setup to have the cable go up the inside of the mountin
> Take the cable down and remake it, add strain relief, and all will
> probably be well.
Is there a standard trick for how to do the strain relief when the antenna is
setup to have the cable go up the inside of the mounting pipe?
-
Thanks everybody for all the roof/antenna hints from
All those lengths and temperatures in some weird old fashioned measuring
system make my head spin.
2009/3/2 Bill Hawkins
> Group,
>
> My GPS time system consists of two Z3801A receivers with two HP cone
> antennas.
> I built a mast from plastic pipe (6" base to 2" arms) that is about 16
> feet t
- Original Message -
From: "Bill Hawkins"
To: "'Discussion of precise time and frequency measurement'"
Sent: Sunday, March 01, 2009 8:05 PM
Subject: [time-nuts] GPS antenna installation problem
> Group,
>
> My GPS time system consists of two Z3801
Bill,
Is your signal degradation sudden or gradual as correlated
with outside temperature?
How well sealed is your outdoor connector? Maybe moisture
or thin layer of ice at the cable-connector-antenna junction?
Monitoring antenna voltage & current could be a good clue
to the source of the proble
Bill
What type of solder did you use?
Some ROHS solders are prone to thermal fatigue.
Bruce
Bill Hawkins wrote:
> Group,
>
> My GPS time system consists of two Z3801A receivers with two HP cone
> antennas.
> I built a mast from plastic pipe (6" base to 2" arms) that is about 16
> feet tall.
> Th
Bill
The coefficient of thermal expansion of solid PE is around 12x that of
copper (17x that of steel), so its seems unlikely that the the inner
conductor would contract faster than the surrounding solid polytethylene
dielectric.
However this only applies when the polyethylene and the inner condu
Group,
My GPS time system consists of two Z3801A receivers with two HP cone
antennas.
I built a mast from plastic pipe (6" base to 2" arms) that is about 16
feet tall.
The antennas are 4 feet apart, each 2' from the center of the mast. The
mast
rises from a deck and is fastened 8' up at the roof l
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