to desense for
this reason.
Bob NO6B
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redesigned the filter to cut off a bit low in frequency (210 Hz) in order
to slightly improve system audio quality, since I didn't need brick-wall
filtering at the higher tone freqs. that I don't use.
Happy Thanksgiving everyone!
Bob NO6B
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all the time.
Bob NO6B
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of rejection
@ 600 kHz from resonance. That should knock the TX noise down enough to
eliminate your desense.
70 dB of TX freq. suppression on the RX leg of the duplexer should be just
enough for any decent RX.
Bob NO6B
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a 1/4 or
1/2 wavelength measured from the can to the center of the T. But with the
Q202G I'm not sure. The safest way to go is to simply lengthen the jumpers by
the ratio of the frequency change (163/146).
Bob NO6B
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the CTCSS area free for the stock CG decoder. Perfect for
portapeater use.
An excellent find, Budd - thanks!
Bob NO6B
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I'm looking for a program that I can use for diagnostic decoding of DTMF
tones. I see 100's of links on the net to WinTone at
www.steaksandwich.com, but that site appears to be dead. Anyone know where
I can find WinTone or something similar? Thanks.
Bob NO6B
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in the
archives; I must be using the wrong words to search for it.
I have a need for such a board in a rather short time frame. Does anybody
have any of these that they'd like to part with or have the design so I can
build one? Or Kevin perhaps you have the updated design ready?
Bob NO6B
-2.1.
True gain is all ways in dbd, Its
Depends on what you consider a reference. I think of a dipole as having
gain (2.1 dBi) because it does not radiate evenly in all directions. But
then I risk starting another debate like FM vs PM.
Bob NO6B
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I've seen several of these show up on eBay over the past few months. I
assume it's Wavetek's version of the Ramsey COM 3. Am I correct? Any
other thoughts in regards to its quality?
Bob NO6B
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all the documentation
it had to Documents Incorporated in Greensboro NC. Unfortunately the
trail goes cold there; I can't find any business in Greensboro under that name.
TIA.
Bob NO6B
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operations.
Have they doubled their prices yet to match ICM?
Too bad; crossing another crystal vendor off my list. Let's just hope they
don't swallow up West Crystal.
Bob NO6B
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?
Are you going to Dayton? I can bring it for you if you like. If not, I
may even be driving through that area on the way back. Would like to try
out this repeater we've heard so much about on the list.
Bob NO6B
P.S.: The price is right: free unless you want me to ship it, then just
shipping
not quite there yet.
Time for a Z-matcher or isolator.
Bob NO6B
Might see about the cables, I
think they were originally cut for 147 Mhz, might need to be changed to get
a better match.
A 2 MHz move will not make a difference w.r.t. duplexer cavity
intercabling. If you don't have a Z-matcher
to Dayton for me.
Finally, is there any interest in a Repeater-Builder list dinner Saturday
night? 2 years ago a few of us met for a nice get-together at Cozymels in
Miamisburg.
Bob NO6B
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Here's the 800 Hz BPF for the square wave outputs of the K-ID ID-O-MATIC
PIC IDers.
Bob NO6B
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, but it really doesn't matter as long as the manufacturer
states dbi or dBd. Without the reference a gain figure is useless.
Bob NO6B
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At 22:53 5/13/2005 -0500, you wrote:
YO - Cw Won on Jay Leno tonite
Dave / NØATH
You didn't put SPOILER ALERT in the subject for us poor West Coast slobs!
That's OK, now I don't have to stay up watch.
Bob NO6B
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of loss at my input, so I had to retune
it. However, I can't get the minimum loss below 2 dB ripple less than 1
dB. Just wondering if this is normal for this particular preselector.
Bob NO6B
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or so before dropping out completely.
Bob NO6B
At 20:15 7/25/2005 -0400, you wrote:
I'd look at the comp line on the ICOM and see if it's doing anything
strange when PTT drops. You'll probably need a DSO or something similiar
to capture it since it's such a short duration. While you're
that with anything you've just created an impedance bump,
which you may not see at 2 meters due to the short electrical length of the
connector but may be a problem at higher freqs.
Bob NO6B
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if the filtered mic input was used for the repeat
audio, but definitely an issue if you've got 100 mV p-p going straight into
a phase modulator.
Bob NO6B
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At 21:21 11/20/2005, you wrote:
I've never seen a 146/220/440 antenna that I would feel comfortable putting
into repeater service.
I use the Comet CX-333 on a 220 repeater; works quite well. Don't
currently use the other bands on that antenna.
Bob NO6B
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connector will NOT significantly radiate at or below 500 MHz.
Bob NO6B
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there.
If you like the form factor of the Exec II base radio, get it find an 88
mobile, then swap out the RX front-end assy., RX oscillator/multiplier
board TX exciter board. The RFPAs are the same.
Bob NO6B
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. The 567s were fun to play with in
my high school days, but they'll never equal the performance of a
commercial CTCSS decoder.
Bob NO6B
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At 11/26/2005 10:19, you wrote:
One of my first (Hamtronics) 6 meter repeaters
worked fine... same site no duplexer. I had
65 ft antenna separation, a ground plane (converted
CB 5/8 wave) for rx at the top and a low gain
1/2 dipole (converted scanner antenna) at the
bottom.
The elevated site
-area digital elevation data more accurate than
the publicly available (free) SRTM data.
Bob NO6B
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ducting that can't be
accurately modeled, it doesn't make sense for us to try to fine-tune any
ITM software down to the nearest dB.
Bob NO6B
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the
older version that appears to be more correct. I've raised this issue on
the Radio Mobile Yahoogroups but no one seems to care.
Bob NO6B
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,
percentage entry in new version).
Bob NO6B
At 11/27/2005 09:26, you wrote:
Hm I'm using the older versionI N T E R E S T I N G.any other
comments on the newer versionmaybe we should take this the RadioMobile
Group..
Lloyd KD4HTW
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At 11/27/2005 08:03, you
accuracy), but
the nice (or bad) thing about the data is that it includes obstructions
(buildings, water tanks, etc.). Maybe Bob NO6B knows more about it - I
think JPL was involved in it?
SRTM flew in 2000; IIRC the complete data set went public about 2 years
later. AFAIK all human-made
well here - the 20 dB BW is actually just
under 18 kHz.
Bob NO6B
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, the resistor across the
discriminator broadens the frequency response (though audio output is
reduced somewhat).
Bob NO6B
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with a cellphone an interface that provides a standard wired phone
connection from the cellphone. Unfortunately I don't have any info on it
but I can put you in touch with our trustee who did the research on it if
you like.
Bob NO6B
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Actually, they do go down to ~2.5 MHz spacing, albeit barely.
Bob NO6B
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characteristics that are different, too.
73, Bob K0NR
Can't speak directly for the DR-x35 series, but my FT-8500's 9600 baud port
appears to be undeemphasized (what some call flat audio), while the 1200
baud port is deemphasized and squelched (CTCSS squelched as well if enabled).
Bob NO6B
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causing the discriminator output to change
with input noise power.
Bob NO6B
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only add total noise power, never subtract.
Bob NO6B
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noise figure, unconditional stability and reasonable gain
(typically around 12 dB).
Ken
I thought they were around 16-17 dB. Chip claims 17 dB 500 MHz; I once
measured 16.
Bob NO6B
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BW
of 90 MHz.
Bob NO6B
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to the occasional noise on analog.)
Between cable piepan dishes, I assumed that alone would drop the demand
for traditional (legacy?) broadcast reception antennas.
Bob NO6B
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. The devil is green!! Just follow the money and the
truth is evident. Fiber is cheap these days.. so is your congressman..
for sale to the highest bidding lobbyist.
Sounds like a good segue to BPL, but I'll pass.
Bob NO6B
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all I/O looks like 50
ohms. Such a setup won't let you see everything that's going on like a
network analyzer or spectrum analyzer with tracking generator will (I've
done it both ways; both are accurate but the analyzer method is much faster
more fun!).
Bob NO6B
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available, 20 400 kHz, so forget about any NBFM bandwidth measurements.
Bob NO6B
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shielded. The problem is the type of
shield metallization used. Silver-plated RG-214 can be used but is just as
lossy as RG-8, so not good for long lengths.
Given your operating frequency required cable length, I'd go with 1/2
Heliax or some other solid-shielded feedline.
Bob NO6B
- Original
/point
contacts to generate IMD, so it's also extremely linear.
Bob NO6B
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At 1/6/2006 18:03, you wrote:
No it's not. They'll easily get that amount. Just not from hams.
Chuck
Not around here. Many buildings are emptying out following massive rent hikes.
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MOSFET covering all 4
bands, so it's OK. I'm thinking something possibly opened between the
MOSFET drain antenna (switching diode, filter etc.), but why would the
current be so high even on low power (low power on the working bands is
around 1.4 A)?
Bob NO6B
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group - forgot since I turned
off individual e-mails from that one. Thanks.
Bob NO6B
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At 1/10/2006 16:11, you wrote:
The 522-509 is an odd creature. There are two pass and two notch on the
transmitter side, and one pass and one notch on the receiver side.
Discussions about this duplexer came up a while back on this list -
maybe it's in the archives? I think Bob NO6B posted
when driving through a particular area.
Not very funny when you have to waste hours of time chasing these things
down, knocking on doors explaining to total strangers that they have a
nuisance generator within their premises.
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the tower. Worked well.
Bob NO6B
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not a gift)
Bob NO6B
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of this is true, then yes a deep cycle
battery would make more sense.
Bob NO6B
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coax (except silver-plated braid), it's not going to hold up in
duplex service.
Bob NO6B
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, but if you know the
velocity factors physical lengths of it your interconnecting cables,
you can figure out the correct fixed length of coax to use.
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At 1/21/2006 04:48, you wrote:
If you use UHF male connectors, I don't know where you
measure from.
I believe it would be the same as for the male Ns (tip to tip). That puts
your signal just inside the can, where the loop should be.
Bob NO6B
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normally designed for 5 MHz spacing, which would be much easier
to tote around than a full-size 600 kHz spaced 2 meter duplexer.
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power. Once I got used to using my
VNA, my spectrum analyzer was relegated to other tasks.
73, Eric Lemmon WB6FLY
I always thought of the HP8510C as a good network analyzer (you'd think
so with the $100,000 price tag), yet it barely makes it to 100 dB.
Bob NO6B
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on the antenna created a slight impedence mismatch. Using a
If slight antenna impedance changes are causing your PA to oscillate, your
PA needs servicing or replacement. At the very least you need an isolator
on the PA output so it sees 50 ohms across the band.
Bob NO6B
Correction:
All
of tower space either, which is a good thing (TM).
Why so much loss? I have a 2 port combiner I built that has about 1.5 dB
loss. Are your TXs close-spaced in frequency?
Bob NO6B
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. Somehow I get the idea that
the NFCC would frown upon any coordinator that simply says no to any
adjacent coordination based on bandplan discontinuities.
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antenna/feedline is simply a long conductor. Where's
the nonlinearity?
Bob NO6B
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in a catalog that were spec'd only
to 6 GHz. Still way above 0.9 GHz though.
Bob NO6B
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,
as someone once put one in service at a local comm. site with no filtering
it got completely destroyed by IMD. One pass cavity on the RX cleaned it
right up. No preamp before or after.
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At 2/6/2006 19:55, you wrote:
Kevin,
Sorry to bother you again but where do you get these Toshiba S-AV15 modules?
I did a Google search and did not really find anything.
Paul
http://rfparts.com
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Yes.
Bob NO6B
At 2/7/2006 14:24, you wrote:
I assume one wavelength from center to center correct?
T.J. KC8LTS
Bob Dengler [EMAIL PROTECTED] wrote:
At 2/7/2006 09:18 AM, you wrote:
Does anyone know the formula for calculating the distance between two
DB-252 corner reflectors
signal source at my sites, I'm glad I found
one. A little beat up, oddball make with no documentation whatsoever
only does 12.5 kHz steps on UHF (a problem here in 20 kHz SoCal), but it
gets the job done.
Bob NO6B
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to TX through a 6-section UHF mobile duplexer (similar to the
PD-633-6, rated for 50 watts) with 100 watts. As I turned up the power,
the Teflon insulator in the first TX section began to arc at ~80-85 watts.
Bob NO6B
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Committee Chairman in 2001 2002.
Bob NO6B
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have split tone. We need more complaints sent
into the big 3 about this.
Bob NO6B
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At 2/12/2006 08:24, you wrote:
Did you try the V7A with AIP on?
No, I didn't, but I'll do that later today if I get a chance. The other ham
rig in my truck is the other Kenwood dual bander (TM-708? getting old and
don't remember model #'s like I used to). I'm not sure but I think that has
rig for mobile
VHF/UHF repeater use... but...
I was happy to find that the FT-857 will HAPPILY do split-tone.
Yes, but kind of ridiculous to use an 857 just for VHF/UHF.
Bob NO6B
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returned both due to
front-end oscillation problems.
Bob NO6B
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to add a ComSpec TS-64 to them.
Only way to go with these radios. I'm surprised the IRLP folks haven't
published an advisory on them.
Bob NO6B
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for the reference.
Bob NO6B
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on freq needed .( with Permission
Of owner of freq that is used ) .
Yes they are very easy to set up, but not very practical in actual
emergency use since traffic is slowed by more than a factor of 2.
Bob NO6B
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..
I've never had any problems with the leadless Comet/Diamond diplexers, but
if you really want a good one I recommend the TX/RX crossband
coupler. Pricey, but the insertion loss is darn near zero.
Bob NO6B
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their policy to no longer provide
replacement parts, then yes it would be a good idea to avoid them.
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The one I had to replace the base on was in perfect shape otherwise. It
had been in service for only a year or two when the 110' tower collapsed
with the G7 on top. Amazingly the base was the only damaged part of the
antenna, lying right next to a smashed $2000 Bogner.
Bob NO6B
At 3/2/2006
RG-11 do not have a silver-plated braid will
eventually generate desense when used in duplex service.
Bob NO6B
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for your repeater antenna
you can split that off use the UHF side for your remote base. Kind of
doing that in reverse here (2 meter remote base TX combined with 440
repeater output TX).
Bob NO6B
n9lv wrote:
What I need to know is if there is any type of isolator or other
device that I can put
At 3/19/2006 09:00, you wrote:
Bill,
Cheap is not always best. The easy solution is a Communications Specialists
ID-8, which costs about $70. Go here:
Well, when you can get yourself a low-end repeater controller with the IDer
for ~$70, I consider that overpriced.
Bob NO6B
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(tree) last year. Maybe I'll get to it next month if things calm down a bit...
Bob NO6B
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loudspeakers to come inside stop by the
ARRL table to meet your ARRL dignitaries. That gets old after a
while. It did have something Dayton never had AFAIK: a balloon launch
carrying ATV a crossband repeater.
Bob NO6B
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At 4/1/2006 01:38, you wrote:
Some interesting boxes have been appearing on street lights in my area.
Anybody know what they are?
http://www.repeater-builder.com/wa6ilq/whatsthis.html
(two photos totalling about 175KB)
Mike WA6ILQ
http://ricochet.com/about.aspx
Bob NO6B
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.
Maybe a 2sd1499 ?
http://darasemi.com/stock%20pdf/2SD1499.pdf
I found that one too. Doubt that's what Jeff's looking for. The Ft is
only 20 MHz.
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systems had
single isolators.
When dealing with close-freq. TX spacing, equipment shielding seems to be
more important for some reason. Stay away from converted mobiles as
repeaters, or plan on using a separate RX in an RF-tight box with EMI
feedthroughs.
Bob NO6B
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into changes (like
when you disconnect it from the duplexer connect it to a load), it's
unstable. An isolator on its output should keep it happy, but it probably
needs repair as most commercial amps shouldn't mind TXing directly into a
duplexer.
Bob NO6B
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is needed.
Bob NO6B
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for me because my systems have
additional filtering that knocks out the remaining out of band signals. If
your diplexer output goes straight to a broadband preamp, you may have to
add a pass cavity.
Bob NO6B
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want guaranteed 2 or 5 PPM accuracy, by all means send the Icoms in
for installation compensation. At the prices ICM charges for this
service nowdays (~$100/pair I'm told), it might be worth considering the
cheaper alternative.
Bob NO6B
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unwise to
chase anyone away for any reason other than selling non-electronic related
items, which there seemed to be quite a bit of going on last year.
Bob NO6B
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). At 28 pounds, not exactly portable either but will fit
in a car trunk nicely.
Bob NO6B
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* Your use
and a transmit
filter for more than a year and it works just fine.
How far apart are the antennas? 600 kHz split?
Bob NO6B
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. This year I had to provide some
personal assistance with a few folks, but we got every dog gone radio
programmed.
Getting back on topic, if your portapeater user base is 50 watt mobiles,
then I guess desense isn't much of a concern for you.
Bob NO6B
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on the
TX. It barely worked: no desense but only if the quagi was perfectly
nulled into the omni.
Based on this experience, I'd say two omnis 25' horizonally vertically
separated using solid-state equipment probably wouldn't work without
considerable desense.
Bob NO6B
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pin connector typically found, among other places, on the back of
computers as the serial port connector.
Bob NO6B
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