I bougth an Thunderbolt off E-bay some time ago, to use as
reference for my spectrum analyzer and signal generators.
I had it connected up with a couple of power supplies and it
worked as it should. Today I put together an voltage inverter
to get the -12V to the GPS in order to use it with an
the -12 VDC is also used by the OCXO as tuning voltage! Bert Kehren
In a message dated 6/12/2011 6:05:01 A.M. Eastern Daylight Time,
golgarfrinc...@yahoo.com writes:
I bougth an Thunderbolt off E-bay some time ago, to use as
reference for my spectrum analyzer and signal generators.
I
Arthur Dent-The -12 VDC is used for the RS-232 so if that
was giving you the problem you wouldn't see anything on your
com port (note it will work at -7 VDC or so)...
the -12 VDC is also used by the OCXO as tuning voltage! Bert Kehren
It may or may not be used for tuning voltage but
The -12V is almost certainly used for deriving the tuning voltage. The unit
can generate a tuning voltage of -5V to +5V. To do this it needs a negative
supply... and there does not seem to be an on board bias generator for
generating the negative DAC supply. Becuase of this, for best
Thank you Mark. It is not almost certain it is a fact.
Bert
-Original Message-
From: Mark Sims hol...@hotmail.com
To: time-nuts@febo.com
Sent: Sun, Jun 12, 2011 10:04 am
Subject: [time-nuts] Thunderbolt no usable sats.
The -12V is almost certainly used for deriving the
It may or may not be used for tuning voltage but what I said is
100% correct. The Andrew/Grayson units these T-Bolts were
used in provided -7 VDC for this negative supply and the same
T-Bolts work properly on -12 VDC. If this voltage is missing, the
com port will not work.
+++
Please
I've run test of the effect of the Neg supply on a Tbolt's operation and the
effect on it's noise. (It would seem I'm one of few nuts that actually test
things)
The Neg supply effects the RS232 neg swing and the neg output of the DAC.
As long as the Dac out (OSC EFC input) is than a couple
Is there more than one hardware version of the T'bolt?
Mine has U18 (right behind the RS-232 connector) as an Intersil
ICL232IBE. This is a dual RS-232 transceiver that includes a doubler
and inverter to generate plus and minus 9 to 10 volts from the +5
input. It appears to have the
What's the best small diameter (0.25) low loss coax? I need to run about 30'
from my GPS antenna to a TBolt.
Best,
Dick
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If your antenna has a preamp, then most any coax will do, but if you must, try
LMR-240.
73, Dick, W1KSZ
-Original Message-
From: Dick Moore rich...@hughes.net
Sent: Jun 12, 2011 12:33 PM
To: time-nuts@febo.com
Subject: [time-nuts] Lowloss cable?
What's the best small diameter (0.25)
Hi Jason,
You got yourself a real bargain there. I used sell the product line in the
UK, and these were mega expensive suckers. Nice product though. Enjoy!
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jason Rabel
Sent: 11 June
We used to use RG-9 at Odetics/Zyfer. What gain is your antenna?
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dick Moore
Sent: 12 June 2011 8:34 PM
To: time-nuts@febo.com
Subject: [time-nuts] Lowloss cable?
What's the best
High Dick,
Without giving away the bank, the LMR series of coax is pretty good. But in
reality a high quality version of the
RG-6 Cable TV coax used by the better Cable companies is quite acceptable. If
your local Cable company is one of
those, you can usually tag one of the work trucks and
LMR-240 is a good choice. Attenuation is ~10dB/100'. But if you can
tolerate larger diameter, LMR-400 will cut that in half.
On Sun, Jun 12, 2011 at 3:33 PM, Dick Moore rich...@hughes.net wrote:
What's the best small diameter (0.25) low loss coax? I need to run about
30' from my GPS
WarrenS-.As long as the Dac out (OSC EFC input) is than a
couple of volts above the neg supply (or the EFC is positive) all
worked fine at any Neg supply down to -3 volts.
This is because most RS232 receivers don't need their input to swing
negative.
Your -7 volts statement agrees well
I got a T-bolt from i.fluke. The antenna came with a length of
50 ohm rg58. I added 75' of TV style rg6 and it works fine
with no amplification needed beyond that in the antenna.
It did not seem to mind the 50 to 75 oh mismatch.
I did notice with the first T-bolt I got that it could not see
Dick wrote:
What's the best small diameter (0.25) low loss coax?
How nuts do you want to get? You shouldn't need anything better than
a good RG-59 (75 ohms) for a 30' run. For that, I'd probably use
Belden 1426A if I were restricted to 0.25. Good foam RG-6 (also
75 ohms) like Belden
HI all;
I believe the T-nuts have coined a new name for GPS antennas, Mushrooms! I
always hated the term pucks any how.
Regards; Rich
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On 6/12/11 2:29 PM, Rich and Marcia Putz wrote:
HI all;
I believe the T-nuts have coined a new name for GPS antennas, Mushrooms! I always hated
the term pucks any how.
well.. when you put a puck on top of a 6 foot length of conduit, it
really does look like a mushroom (sort of like Enoki)
And an old, weathered bullet might resemble a morel.
On Sun, Jun 12, 2011 at 6:18 PM, Jim Lux jim...@earthlink.net wrote:
On 6/12/11 2:29 PM, Rich and Marcia Putz wrote:
HI all;
I believe the T-nuts have coined a new name for GPS antennas, Mushrooms!
I always hated the term pucks any
Wrote: Except, of course, if I could find a nice set of nixie tubes at a
reasonable price, and a
set of sockets and a transformer for the high-voltage supply ... !
For the microprocessor challenged such as I,
IN-14 Nixie Tube Clock Kit With Tubes Included ebay 170652988069
Even has gps or
Thanks all -- I got a Lucent bullet from i.fluke, +26dB gain. Replaces a Hawk
patch with lower gain, but I want to run more cable (about 2X) to get the
bullet higher in the air. The Hawk patch, which works very well signal-wise,
has cable that's about 3 or 4mm in diameter and about 6m long.
rich...@hughes.net said:
What's the best small diameter (0.25) low loss coax? I need to run about
30' from my GPS antenna to a TBolt.
There are two sources of attenuation. One is the dielectric losses. The
other is resistance, primarily skin effect on the center conductor.
Most modern
For a given OD the centre conductor will be SMALLER diameter for 75 ohm
cable wrpt 50 ohm cable.
Google for the whole minimum loss/highest power xfer capability etc issue as
regards coax cable diameter and impedance. All std textbook stuff. Or used
to be!
DaveB, NZ
- Original Message
On 6/12/11 7:57 PM, Dave Brown wrote:
For a given OD the centre conductor will be SMALLER diameter for 75 ohm
cable wrpt 50 ohm cable.
Google for the whole minimum loss/highest power xfer capability etc
issue as regards coax cable diameter and impedance. All std textbook
stuff. Or used to be!
On Sun, Jun 12, 2011 at 12:33 PM, Dick Moore rich...@hughes.net wrote:
What's the best small diameter (0.25) low loss coax? I need to run about
30' from my GPS antenna to a TBolt.
Low loss and a 0.25 diameter don't go together. The loss generally
depends on the diameter. The way to figure
Hi Dick,
To get through windows without drilling och sawing, I found a very flat
flex-cable, that you can close your window over.
http://www.kjell.com/content/media/images/items/30161.jpg
It is probably mostly for people wanting to get a cable through to a sat
dish or outside TV antenna in
On Sun, Jun 12, 2011 at 6:04 PM, Dick Moore rich...@hughes.net wrote:
... I've sawed out a part of a plastic window frame to get the cable inside.
So I don't want any cable that's bigger than 0.25 d. and preferably smaller.
Hope this clarification helps a bit.
Go with larger cable up to the
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