maximum
performance out of the system.
The two D-Star/analog system pairings I know of locally are both maintained
by the same respective groups, so I think they know what they're doing.
Bob NO6B
it.
..except having to retune the duplexer after you detune it looking for the
real problem. BTDT.
Bob NO6B
At 5/8/2008 11:26, you wrote:
Search for a 600kHz switch mode power supply opperating in the
vicinity of your repeater.
...or a video camera, TV or Dish Network/DirecTV dish. I've had mixes
occur in all three.
Bob NO6B
I'm thinking about an interface for the Yaesu FT-8500, as
everything can be controlled from the PCC interface, which is fully
documented in the manual.
Bob NO6B
SPI, similar to the data
stream running between the controller RBI-1 except there is a 2nd SPI
data line for data going back from the radio to the remote interface. I
assume this is used for the COS indicator possibly who knows what else???
Bob NO6B
:
Are the other bytes reversed (MSB clocked in first), or are all bytes LSB
first?
Bob NO6B
not be an issue.
Bob NO6B
done, each radio's control format can be
individually addressed.
Probably better to let the various Repeater Controller Mfgrs
have a go at building it into their controllers. Resistance is
futile...
Hasn't really happened yet, so I don't expect it to.
Bob NO6B
The problem with high loss tangent is that you'd never see it as reflected
power. You could lose 3 dB or more never know it.
Bob NO6B
At 5/4/2008 04:53, you wrote:
Boy, you took a gamble. I'd have been afraid that this action could have
either messed up the VSWR or shifted the resonant point
I painted a refurbished, retuned UHF StationMaster with white Krylon spray
paint. Checked VSWR signal strengths before after: no change.
Bob NO6B
At 5/4/2008 06:52, you wrote:
Funny you should mention Krylon... although I haven't done so in recent
years, I used to Krylon (clear) all
at room temperature.
It's possible that some materials may still have low loss @ 50 or 146 MHz,
but have high loss at 2.45 GHz (where the microwave oven's magnetron tube
operates), so you may get some false positives with this test, but if it
passes it's definitely a good material.
Bob NO6B
At 5/4/2008 12:36, you wrote:
Have you looked into the arcom controllers, they have remote base radio
control. I use one with my yaesu 857 and it works great. All modes. All
bands. That was until my receiver died
The Arcom controllers do not suit my needs.
Bob NO6B
) is separate from the poly cup used to test the material.
Bob NO6B
what the Doug hall sold for.
http://www.arcomcontrollers.com/rc210/rc210.htmlhttp://www.arcomcontrollers.com/rc210/rc210.html
The RC-210 does not suit my needs. It also doesn't (nor does any other
controller) control the Kenwood TM-xx1 mobiles.
Bob NO6B
(both antennas were on top of the tower, where no TXing was
allowed). The bad antenna was a commercial fiberglass omni, about 10 to 12
ft. long.
Bob NO6B
interface that can talk to most
VHF/UHF radios.
Bob NO6B
can be shipped
UPS. Located west of Fort Wayne, Indiana.
Doug Hall Voter prefer rack mount
Doug Hall RBI-1
^^^
I guess these things are in high demand, as I'm looking for one too. No
trades for me - will pay $$$ for one.
Bob NO6B
. Op amps have much higher gain, so much that they are rarely
used for audio applications without negative feedback.
Bob NO6B
NO6B
At 4/26/2008 05:52, you wrote:
At the Hamvention there is a shipping service. They are costly, but there.
73, ron, n9ee/r
Will they ship DHL?
Bob NO6B
- no capacitor
plates to arc. Very robust.
Bob NO6B
there are no DHL shipping centers close to Hara.
Bob NO6B
is. You can't measure that with a
DMM. If that RG-214 jumper has copper shield, you may start experiencing
desense within a couple of years after installation.
Bob NO6B
for the chip.
Bob NO6B
built an 8-pole Butterworth LPF plugged an LM324 into the socket,
listened to the output using a separate speaker amp, then swapped out the
LM324 with a TL084. I could definitely hear a touch of high frequency
distortion with the LM324 that wasn't there when using the TL084.
Bob NO6B
sensitive that they always glitched in my noisy high school-era
circuits. I found the LM324 quad op amp to be much more stable
versatile. One section could be the COR, another the timeout timer, yet
another the audio amp/de-emphasis.
Bob NO6B
I got home I
took a close look at one of the connectors could make out a couple of
COPPER braid strands. That jumper got the colored tape band applied to the
middle, my indicator that it's no good for duplex.
Bob NO6B
know. Thanks.
Bob NO6B
P.S.: I know the 7330 doesn't support the RBI-1 yet but am confident it
soon will :)
convenient straightforward.
Bob NO6B
At 4/21/2008 05:10, you wrote:
topozone.com, previously a free source for geographic coordinate and
topographic information, has now converted to a pay for service
provider.
Hopefully the same thing does not happen to google earth!
Try the Acme mapper: http://acme.com
Bob NO6B
if you only move 12.5 kHz away.
Bob NO6B
as
well so hasn't been very busy.
Bob NO6B
but less != zero.
Bob NO6B
this problem but most attendees don't have them. Fortunately there are
many repeaters set up in the flea market that solve this problem.
I'll be monitoring my 2 meter portable repeater, which will be in the lot
across the street. 147.750 in/144.930 out, PL-123.0.
Bob NO6B
the RX side
for your application. If they do end up being reversed, I cover up the
original labels with the correct designation. Connecting a duplexer
backwards on site can be a bad thing :(
Bob NO6B
will have the
same problems w.r.t. duplex service as LMR-400 Belden 9913.
Bob NO6B
actually had plain copper-braided
RG-214 coax on the antenna port of a UHF duplexer cause desense; had to
replace it with silver-plated RG-214 to eliminate it.
Bob NO6B
with it, but after discovering that one copper-shielded cable that
caused intermittent desense for several years, I'm not counting on luck
anymore.
Bob NO6B
The link http://home.earthlink.net/~mccrpt on the Repeater-Builder web page
leads to a page not found error on Earthlink's site.
Bob NO6B
this when
the receiver is open from a signal and when the repeater identifies
with the receiver squelched.
The antenna is a DB 224 fed with 7/8 hard line.
What type of feedline are you using between the 7/8 antenna? (I assume
it's not directly connected)
Bob NO6B
have a couple hundred bucks to spend, I highly recommend an old
Singer FM-10. Lower phase noise than a $20,000 HP synthesized sig. gen.,
so it's actually usable for adjacent channel rejection measurements.
Bob NO6B
IF), it probably only means Chip won't offer amateur
discounts or specifically tune/check preamps on amateur
frequencies. They're pretty broadbanded, so this wouldn't be a big deal.
Bob NO6B
At 3/31/2008 20:46, you wrote:
Where can a Singer FM-10 get repaired these days?
Don't know. I do have a service manual, so if mine breaks I guess the
answer for me is right here in the shack.
Bob NO6B
, ~100 milliseconds. If
anyone is having DTMF encoding problems, we'll hear it. Around here, not
using DTMF muting is just asking for trouble.
Bob NO6B
single
band radios.
IMO anyone who can't figure out how to use their radio shouldn't be
volunteering. That is supposedly what distinguishes hams from the general
population: our operating expertise.
Bob NO6B
every month.
Bob NO6B
is different, but for public service events I'd rather have a
thin staff than an adequate number of clueless hams making us look bad.
Bob NO6B
that I think was simply a
defective radio).
Bob NO6B
OK, that will work. Then again, many amateur transceivers have a
simpleton mode that only allows volume, squelch memory channel
adjustment. Might be a cheaper more flexible solution since the radio
can still be easily reprogrammed by anyone who does know the radio.
Bob NO6B
At 3/26/2008
in such areas. In a rural setting, sensitivity
is more important than selectivity.
Bob NO6B
the above a moot point w.r.t. repeater
operation. I just wanted to set the record straight on the RF performance
of that model. It's the only radio that could survive our local IMD
alley without falling apart.
Bob NO6B
to the overall system. You can also
factor in the duplexer loss by entering it as an attenuator (1st stage
NF=duplexer loss, 1st stage gain=-duplexer loss).
Bob NO6B
happy medium IMO.
Bob NO6B
relationship. If
you have any links to references on this subject please post. Thanks.
Bob NO6B
,
resulting in heat-related failures such as you describe.
You do need to get the power output down to spec for spectral reasons
No.
and also for life of the PA.
Yes.
Bob NO6B
that crosses to nothing!
I vaguely recall that the Astron supplies fold back the current when the
output is shorted, so at least as far as continuous current rating goes it
probably doesn't need to handle 50 A. Still, the initial surge is going to
be at least 50 A.
Bob NO6B
input. Had this happen with a security
camera once.
Bob NO6B
on your input. Had this happen with a security
camera once.
Bob NO6B
Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.
camera. Still had lots of
15.7xx kHz horizontal sync in it, enough to generate the mix. We simply
disconnected it to solve the problem (with the site owner's permission, of
course).
Bob NO6B
involved in the mix (a low power paging
transmitter) went away, I've never had any problems since.
Bob NO6B
for the space their brochures are
occupying. Otherwise, I have a whole slew of Kenwood, Yaesu Alinco
brochures ready to upload (remember, Alinco has radios with digital voice
capability too!).
Bob NO6B
the output to drop go spurious.
Bob NO6B
of Yaesu's Kenwood's latest radios?
Bob NO6B
At 2/23/2008 15:38, you wrote:
I reccommend Advanced Circuts in Colorado. 4pcb.com.
I also recommend Advanced Circuits.
Bob NO6B
to deal with.
Don't forget the popcorn that comes with each order ;)
Bob NO6B
feed or the coaxial phasing harness.
Bob NO6B
would use those anymore at comm.
sites, but bad antennas/tower joints unprotected TXs have always been the
culprits I've found.
Bob NO6B
At 1/22/2008 10:25, you wrote:
Bob
If the tantalum went immediately it was either in backwards or there is a
power supply that is supplying a negative spike.
No, it was bad, all the capacitors of that value in my parts bin were
bad. They arced around 10-15 V (rated @ 35 V).
Bob NO6B
hot due to heat
conduction from the PC board.
I put a 1 µF 50 V non-polarized cap. in place of it so far it's holding
up. I also checked the PA output on the spectrum analyzer, both directly
looking into the flatpack duplexer with without the extra capacitor: no
spurs.
Bob NO6B
73
it on the spectrum analyzer tomorrow (after it's somewhat
deodorized), but I doubt it's spurious.
Any other ideas as to what would cause this cap. to repeatedly fail?
Bob NO6B
.xxx.
The notice was prompted by numerous complaints to the FCC sent by users of
my repeater as well as a co-channelled repeater, each claiming interference
from the other repeater.
Bob NO6B
a line
of machinable ceramic if you can find it that works great for RF.
Not sure how common this stuff is, but TPX (a.k.a. polymethylpentene) has
very low dielectric loss at microwave frequencies... and beyond.
Bob NO6B
, prefers the approach you're currently
using (hub at non-comm site). You might want to send an email to 20kHz at
scrrba dot org see what it has to say about your particular operation.
Bob NO6B
major network affiliates on Feb. '09.
Bob NO6B
useless OTA programming (I don't/won't pay for
locals via the dish) continue to watch std. def. TV via the dishes.
Bob NO6B
signal uses the same bandwidth, several channels can be
carried on one signal (I think they used to call this a channel bouquet,
don't know if the term is still in use). So we will end up with the same
amount of spectrum used for TV but with many more channels.
Bob NO6B
broadcasting for SoCal.
Bob NO6B
between the TX duplexer, just
not inside the duplexer definitely not at the antenna connector or
beyond - that's the 170 dB zone, where the difference between the TX
carrier RX noise floor is present in the same transmission line.
Bob NO6B
The Linker IIa has audio phase reversal circuitry for outboard CTCSS encoders?
Bob NO6B
At 12/30/2007 17:16, you wrote:
(S, so does the ICS Linker IIa with a TS 64 bd :) )
mailto:[EMAIL PROTECTED][EMAIL PROTECTED] wrote:
Hi Eric,
The world would be a better place if repeater controller
at 10 Hz, so I set up a pair using
this tone, they worked! The CTCSS decode speed wasn't that slow
either. The reason was that the absolute decode bandwidth was just as wide
at 10 Hz as it was at 100 Hz.
Bob NO6B
At 12/29/2007 16:47, you wrote:
Let's see what is wrong with my statement.
The repeater controller keys up the link radio via the PTT. The Audio
Delay Board places a one second delay on the audio being sent to the
Who makes an ADM that can produce a 1 second delay?
Bob NO6B
(excessive voice delay in the system). Best to use outboard CTCSS decoders.
Bob NO6B
of rejection, not good enough for single antenna use, but as a notch filter
for this application it works fine.
Bob NO6B
would be 4 1/3. At that length the connectors begin
to be problematic, as their lengths become a significant portion of the
line. Using N connectors should simplify things a bit, as most of the N
connector is air dielectric, the rest teflon.
Bob NO6B
use them
routinely at several GHz with no major losses noted.
Bob NO6B
your TX frequency.
Bob NO6B
a converted CB for 10 FM. Added a CTCSS encoder; worked fine.
Bob NO6B
such details to us in the form of
coordination standards bandplans.
Bob NO6B
system, I don't think we'd see a large increase in the number of
systems should the size of the band be increased.
When the skip closes down, few hams use 10 FM locally.
The same is true of every other mode on 10 meters, as well as the other HF
bands.
Bob NO6B
for tuning a duplexer where 80 dB of isolation is required.
Bob NO6B
of
success any such petition needs to clearly demonstrate that the expansion
would have minimal impact on other non-repeater 10 meter activities.
Bob NO6B
At 12/22/2007 11:10, you wrote:
Ooops, dropped a 2 from the Ebay item number. Here's the correct one
280185868722
Ken
Yup, looks like the kind of stuff that ends up in the Dayton dumpster
Sunday afternoon.
Bob NO6B
this article:
http://www.cebik.com/trans/ser.htmlhttp://www.cebik.com/trans/ser.html
I ran a simulation of the above on Puff confirmed it works fine.
Bob NO6B
is recessed. A little carving
of the molding on the PS/2 cable connector with an Exacto knife or Dremel
takes care of that.
Bob NO6B
voltage
disconnect circuit.
http://www.newmarpower.com/DC_Power_Accessories/DC_Power_Accessories.htmlhttp://www.newmarpower.com/DC_Power_Accessories/DC_Power_Accessories.html
cheers,
s.
One could put this behind it:
http://www.byonics.com/apo3/
Bob NO6B
, which is already a few
milliseconds slower to release on strong signals than the Micor
squelch. Has anyone measured the difference in short squelch mode before
after this mod?
Bob NO6B
between the tx and rx in a mobile. NO6B may want to
revisit his problem MII and look at the ptt line. He may be pleasantly
surprised.
I'll have to try that next time I have the radio in front of me; thanks
Steve.The spurs I'm seeing are not being manufactured in the PA, as
they're present
) add a 3.3 uF cap
to pin 13 of U901 to make the MVP squelch work like a Mastr II mobile squelch.
Oops, that should have been 4.7 uF on pin 13 (had Micor squelch on my mind)
of course it goes to ground.
Bob NO6B
of a capacitor would reduce the
squelch attack time. OTOH it may increase the fast squelch release time,
which would be very undesirable IMO.
If I get some time I'll try the mod. measure the length of the FQ squelch
tail before after the capacitor change.
Bob NO6B
there's some RF bypass cap or
other component that's failed within the ICOM itself, allowing RF to
travel that DC temperature control line.
Forgot to mention: I thought about this too tried severing the comp. line
between TX RX ICOMs. No effect on the spur problem.
Bob NO6B
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