of the radios from where I sit. But I sure hear that tone at
the beginning of each transmission.
If they'd just use 1/2 second or so of audio delay on the TX audio, they
could stick the data burst in front of the audio without losing anything.
Bob NO6B
to use, since it's a defacto 19 rack
mount standard. I've also seen racks tapped with 12-24, but that screw
size isn't as easy to find.
Bob NO6B
At 8/23/2008 19:23, you wrote:
Yep. 88 is the thicker version of 33+. However, I prefer the 33+.
Chuck
WB2EDV
I tried 88 once. For some reason it didn't stick as well as 33+.
Bob NO6B
for a while. Removing
the cavity cleared the problem.
Again be careful.
David
If a TX goes spurious when a pass cavity is added, it's RFPA is defective
is in need of repair. Leaving the pass cavity off is very poor practice.
Bob NO6B
.
I get that on a 440 system I maintain. It's annoying, but I can't claim
that the interference is harmful. Unless your popcorn is actually
blocking signals, I don't think you have a case to get it moved elsewhere.
Bob NO6B
as frequent are seemingly random (no discernable period, more like
real popcorn).
Bob NO6B
Orange County, which uses 136.5 Hz
on just about all open systems except for one large club that decided they
simply don't want to change.
Bob NO6B
to pay for
the trip :)
4. Which repeater controller? Or is that a religious question?
preach
LinkComm, SCom.
/preach
Bob NO6B
inductors.
Bob NO6B
, whichever
way you want to look at it.
I thought this might be interesting to the group -
Yes. But what about multipath? Ground reflection adding to the direct
path can result in severe ghosting.
Bob NO6B
witnessed what effect
the snow and ice had on it.
How strange. My G6 was on Sunset Ridge (similar elevation/climate) for
over 15 years. When it came down it looked ~15 years old - not too
bad. Are you sure someone didn't pull an antenna switcheroo on you?
Bob NO6B
get smashed when the 90' pine tree it was in got cut down.
Maybe the ones they're making now are no good? The 80's vintage G6s were
definitely rugged.
Bob NO6B
to go out of business. They
are already acting like it. - Mike
They must not have gotten your message, as I'm absolutely sure one of their
staff would have immediately replied to your query.
Bob NO6B
years old still
working fine.
Bob NO6B
449.5 MHz. Can't say I ever
TXed into it around 440 MHz, but never had any RX problems with it at that
frequency.
Bob NO6B
logic. I
believe it draws over 0.5 amps. No relays.
Bob NO6B
.
Bob NO6B
a while back concluded that
the LinkComm RLC-2a RLC-3 will control an FT-100D. Taking a quick look
at the FT-900 CAT format (supported by both controllers), it appears
similar to the FT-100D.
Bob NO6B
batteries for TX RX because if either goes
dead, your system is off the air, whereas if both power the entire system,
both must go dead before the system goes down.
Bob NO6B
At 7/30/2008 17:52, you wrote:
I've been pulling my hair out trying to figure out a problem with my
224.060 repeater in Norwell, MA. Somehow the transmitter is feeding
back into the receiver. This all started happening back during the
Got a 1600 AM station nearby?
Bob NO6B
a portable
RF-proofed RX may help identify specific sources.
Bob NO6B
don't think it would help in this case
- no other in-band signals to isolate.
Bob NO6B
=AMtabSearchType=ApplsAppIDNumber=594312sHours=D
Looks to me like his repeater site is just inside the main lobe.
Bob NO6B
At 7/28/2008 08:11, you wrote:
Hello,
I am looking to set up a 1.25m repeater, and am looking for opinions on
what radios are the simplest and most readily available to accomplish
this.
Midland 13-509.
http://www.repeater-builder.com/midland/midland-index.html#amateur
Bob NO6B
an unstable RFPA that
doesn't like the new off-channel reactance being presented to it by the
duplexer.
Bob NO6B
thought I would query
the group for suggestions for one with this capability.
Thanks - Jim W5ZIT
LinkComm: RLC-1+, RLC-DSP404
SCom: 7330 (may not support A/D readback yet, but will soon - the hardware
is there firmware for it is being developed now).
Bob NO6B
boards work. Maybe a little dirty for CTCSS work, but
cheap.
Bob NO6B
. was probably 70 dB. I ended up
installing the system with 3 cans on the TX 2 on the RX.
Bob NO6B
NO6B
to reliably decode. Don't know if they're all that way or just
the one I tried.
Bob NO6B
case the latter becomes part
of the antenna.
Bob NO6B
a crystal-controlled radio isn't quite worth the expense IMO.
Bob NO6B
at
the analog/DTV cutover in Feb. 2009. Ironically, 6 meters may become less
noisy on Mt. Wilson than UHF. :(
Bob NO6B
|\
..\
..|
-
.---
..-
V+ can be either 5 or 12 V, depending on what output high voltage you need.
Bob NO6B
At 7/10/2008 07:59, you wrote:
Ch 2-6 will not go dead in Feb 2007. Some stations will turn off their analog
I forgot to say in SoCal. No VHF LB HDTV here in SoCal, before or after
the cutover.
Bob NO6B
every other Yahoo list I belong to is set to reject attached files. I
didn't realize this one still allows them.
Bob NO6B
tuned to 152 MHz they tuned down
to 146 MHz with no problem. It's true that a circulator made for 160+ MHz
probably won't tune all the way down to 2 meters, but moving only 5 MHz or
so from the original frequency isn't going to be a problem in most cases.
Bob NO6B
|\
\
|
-
---
-
V+ can be either 5 or 12 V, depending on what output high voltage you need.
Bob NO6B
. |\
. \
. |
. -
.---
. -
V+ can be either 5 or 12 V, depending on what output high voltage you need.
Bob NO6B
if your repeater is in SoCal, where the antenna noise temperature
on 2 meters is about 10 dB above kTB, so throwing away a couple of dB
between the antenna RX isn't going to hurt you.
Bob NO6B
John:
I'm not seeing your reply text. Please turn off all text formatting in
your e-mail client resend as plain text. Thanks.
Bob NO6B
At 7/5/2008 06:32, you wrote:
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED
myself trying to fix a simple problem. When I get the electrician
out here, I'll have him check all that. In the meantime, Christmas lights
are safe to use on that outlet.
Bob NO6B
.
Bob NO6B
, I can't stand working with
solid wire.
I need to have some other electrical work done in that area. When I do,
I'll have the electrician take care of it as part of the job.
Bob NO6B
to make them the optimum length.
Also, could someone tell me whether the lengths of cables going to the tee
connector are significant? Any information and suggestions are
appreciated. Thanks.
Is the duplexer not meeting its loss or isolation specs?
Bob NO6B
I see no added text here, only my forwarded message.
Bob NO6B
At 7/2/2008 10:38, you wrote:
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, July 02, 2008 11:35 AM
To: Repeater-Builder@yahoogroups.com
can get access to
one). However, there are many other possible causes of desense. The most
common I run into are mixes caused by bad hardware in the near field of the
antenna (other bad antennas, feedline, loose tower joints, etc.).
Bob NO6B
at the preamp (RX)
input. Again, if there is enough margin designed into the system there
should be no problem. In this case a pass cavity between the duplexer
preamp adds that extra margin, in addition to adding some protection from
out of band signals even lightning.
Bob NO6B
off the RX. This results in a very IMD-resistant
setup, since there are no active devices ahead of the helical resonators.
Bob NO6B
noticeable.
Bob NO6B
(that means VHFLB cavities
being used @ UHF don't count) that has enough Q that 12.5 kHz is going to
make a significant difference.
I say don't bother having the duplexer retuned unless you think it would
need retuning without any frequency change.
Bob NO6B
having the duplexer retuned unless you
think it would need retuning without any frequency change.
Bob NO6B
It's OK to disagree and its also OK to be detail orientated
when you're trying to get the maximum possible performance.
If the above is true, then if your system isolation margin is only
.
Bob NO6B
. The Comet, Diamond less expensive
knock-offs didn't exist back then. I tried building a StationMaster out of
RG-8, but I could never get known-good plans for one (this was even before
the days of dial-up BBSs).
Bob NO6B
probably can't beat the Comet or Diamond
antennas. Only problem is the high gain versions (GP9/X500HNA) are going
to bend a lot in high winds. Haven't noticed a problem out here, but then
again we don't often get winds 50 MPH.
Bob NO6B
controller.
Bob NO6B
reason they aren't up longer is hardware upgrades or
power outages.
Bob NO6B
of VOX circuit is required.
How about RecAll/RecAllPro? http://sagebrush.com . Has built-in VOX. If
you want to record two separate channels, install a 2nd sound card in the
PC run two instances of RecAllPro, one for each sound card (yes this
works, at least on Win2000).
Bob NO6B
SeaMonkey, etc.). I think Win2000 is a bit more mature since it's been
hacked on for over 7 years now.
Bob NO6B
voted, particularly if the
user wasn't moving. Several examples of such a scenario occurring during
the LA Marathon come to mind...
Bob NO6B
only need 1 sound card.
Bob NO6B
was minimal. However, the attenuation directly reduced the TX
signal leaving the site. So the net effect was the site heard OK but
TXing out was difficult.
Bob NO6B
NO6B
P.S.: you will definitely get ducking if your repeater is in their
migratory path ;)
get narrower at higher
frequencies wider at lower frequencies. The butterfly side lobes
appear mainly at higher frequencies.
Bob NO6B
that correctly
handles multiple sound cards.
What do you mean by correctly handles? I have 2 sound cards in my
Win2000 system here they both work simultaneously with no problems.
Bob NO6B
-feed dipole array, which is what's being discussed in this
thread. In fact, although the gain may be a bit lower at lower
frequencies, the simulations I've run show reduced sidelobes a
correspondingly fatter main lobe.
Bob NO6B
is by how much. Would be easy to
calculate in NECWin if I could only get a good NEC model for the coaxial
colinear array. I'm not quite expert enough in NEC to figure out how to
create that model.
Bob NO6B
to the fast decay coupled with a somewhat slower
attack. Switching the COS feed from RUS to CAS solves the attack problem
but the logic threshold voltage needs to be set just right for proper
operation.
Bob NO6B
on upstream low pass filtering, it might behave as you observed.
Bob NO6B
) ;-]
Dan N8DJP
I thought someone recently asked for the dipole feed impedance as well, so...
If I'm reading the diagram right, the dipole feed impedance is 100 ohms.
Bob NO6B
antenna that became unusable after a near hit: it now
generates noise if used on TX. Perfectly good for RX, though. We now use
it for RX only TX with a Comet GP9.
Bob NO6B
spare antenna.
Bob NO6B
for this.
AFAIK they still do: http://www.com-spec.com/narrow.htm
Bob NO6B
in the thread, but are you getting your
discriminator output from VOL/SQ HI? I've never seen any significant 455
kHz at this point, yet it still contains all the high frequency
unde-emphasized noise your outboard squelch circuit needs.
Bob NO6B
the mobile duplexer you need.
Bob NO6B
At 5/29/2008 06:43, you wrote:
Wayne, you may have a point on the third harmonic cavity tuning. I have
several cans that are marked for 440 and look just like a standard 2 Meter
can. I have looked at the coupling loops and they are smaller than the
ones
be greatly appreciated.
Build it like Sutro tower, where the center of gravity is in the base of
the tower (or underground like Sutro).
So that's why Sutro looks so unusual. And I thought it was just because
it's in SF.
Bob NO6B
At 5/28/2008 07:24, you wrote:
I don't think there is anything connected to the CG HI input right now so I
will give it a try.
It is a Mastr II station.
If you're not using CG at all, you can simply short CG HI to CG LO.
Bob NO6B
Every time I had this problem it turned out to be discriminator noise
somehow coupling into the CG HI input (assuming you have a duplexed
radio). Troubleshooting was easy: put a full quieting signal into the RX
see if it goes away.
A 0.1 uF to ground on CG HI took care of it.
Bob NO6B
At 5
be tuned down to about 2.5 MHz, allowing use on 2 meters
for portable repeaters.
Bob NO6B
(the version that looks like a GE Mobile) but
at that price I'm sure he took them back home or they went into
the scoop loader on Sunday.
Not as bad as the $200 75 watt UHF Mastr II mobile. It did have a UHS
preamp, but come on, $200 for a Mastr II mobile?
Bob NO6B
replacement picture tubes for them.
BTW, I highly recommend the above as an additional activity before or after
Dayton. Normally they're only open on the weekends, but if enough of us
want to visit during the week (say, the Thursday before Dayton), I think
they'll open for us.
Bob NO6B
need the mod.
details let me know. The center passband loss should be around 1 dB.
Bob NO6B
braided coax but it stopped when it hit the
braid. Fortunately this was inside the building.
Bob NO6B
At 12:04 PM 5/21/2008, you wrote:
If you watch any of the I love the 70's, 80's or 90's TV Programs
on MTV or VH1... they been using the Part Deux hook for some years
now. It's a Pop Culture history type TV Program...
I thought it started with the 2nd Naked Gun movie.
Bob NO6B, on my way home
of transmit noise inside the buildings, go
figure
Paul
My 2 meter system was in my rental car parked across the street (dirt lot
on Friday, old car dealership the other 2) using a dual band mag mount
antenna . Covered the entire facility.
Bob NO6B
At 12:00 AM 5/20/2008, you wrote:
If they are 77 split mastr II's, it is likely to be difficult to retune
up to the 440 band.
But not impossible with modifications.
Even easier: trade with someone with an 88. 77s are harder to find
highly sought after.
Bob NO6B
having a little fun with me at that point :) ).
Bob NO6B
.
Bob NO6B
they would be on,
but then neglected to program them into my HT.
Bob NO6B
on a 440 channel, probably because
most of the portable repeaters are on 440.
Bob NO6B
the transmitter side's notch, but may be workable for
control.
As I said in my previous post, I'm running a link RX 600 kHz away from the
input at 2 sites. No desense. So I wouldn't worry about your control RX
being only 50-100 kHz away from your input.
Bob NO6B
but no good for
duplexed connections (on or after the duplexer T).
Bob NO6B
something's wrong :O
Bob NO6B
of the duplexer through a pass cavity) feed the coupled port
to the link RX. The off-channel loss of the pass cavity pass response of
the duplexer results in a few more dB of loss, but since my link paths are
line-of-sight I don't notice the loss.
Bob NO6B
load on the other side; remove the
elbow, desense gone!).
Bob NO6B
(compared against a known
Yagi antenna using multiple far-field signal sources). It is in fact as
they claim, around 11.5 dBi.
Bob NO6B
to
it now, but the gist of the article was that the ideal dipole standard is
almost as theoretical as the isotropic source, that it is possible to
closely approximate the isotropic radiator, so the real world dipole
reference is in fact a fallacy.
Bob NO6B
consensus. Let's move on.
A standard that is largely ignored is not much of a standard. I'll
continue to use dBi.
Bob NO6B
with some RG-142, but the 142 is .25 diameter and the 213 is
.5 diameter.
The RG-213 has copper braid shielding, which will eventually cause desense.
Bob NO6B
system owners aren't too keen on downgrading their
system's coverage.
Bob NO6B
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