Try using a short piece of 75 ohm feedline and watch the smoke come from
the caps over the finals - your existing phase detector won't work well
off the laboratory test bench. Most of the caps need to be increased
slightly and the two blocks which are bandpass filters will need to be
changed or mod
Yes, this will tune into the ham band without serious mods - a word of
caution before you continue running the ep38, check the integrity of the
bleeder resistors that are on each high voltage cap - if any doubt
replace them all before someone gets hurt. And when you tune the exciter
you can pull th
You should see about 350-500 milliwatts going to the pa deck and the
bias/control line must be connected properly to the station frame. Many
times I see these stations for sale at hamfests with the jumper wire
allowing the pa to run only full-tilt-boogey, which is why they crash
and burn so often -
Major remodeling forces the computer to the closet, hope to return just
after field day. For those who like the glow in the dark stuff - may the
force be with you, I just heard a name for the glowing vavles,
"vacu-fets", I know you guys will have fun with this in my absense.
Look for field day call
I don't know why you would have trouble, in Cleveburg, Ohio there are 2
or 3 100 watt and one 300 watt 2 mtr machine perched on hospitals just
running fine day and nite. One has a glass antenna cause I am borrowing
the 224, but when this appears I will likely get a phone message to
return the anten
You still have to do the divide by how many arms to the power divider
cabling, as someone mentioned it weakens the overall rx department,
however I have tryed this with just 3 3 element beams using the tower as
the reflector and it seems to work pretty good, when the weather is a
sure thing we are
If you are looking for a voter contact paul wd5idm, I hope I have the
call correct - he is a regular here and has some like new spares he can
get you at the right price with paperwork.
N9WYS wrote:
>
> Thanks, Jim... Since this posting, I have discovered we actually need to
> transmit on 927, s
Only if you can find the ones built in bc, as in before cartoons.
Speaking of before cartoons, the master eleven is half of a mastr22
right?
Chuck Kelsey wrote:
>
> Now, that's a Syntor 10 (ten) isn't it?
> Chuck
> WB2EDV
>
> - Original Message -
> From: <[EMAIL PROTECTED]>
> To:
> Sen
I guess it depends on the amount of filtering you can have for each of
the frequencies you want to use, and the cable switching needed to use
the cavities for that freq. Imagine a coax switch with a port for every
frequency you want to activate, now duplicate that so that you can
transmit and recie
Trade the antenna for a shielded dummy load, or possibly 1000 feet of
rg400 to attenuate the signal down.
Ken Arck wrote:
>
> At 09:15 PM 5/21/2004 -0500, you wrote:
>
> >Would there be any advantage to putting the radio in an RF box for
> >shielding?
>
> <---The short answer? Only if you put t
They will go without anything, I have the 38mhz 4set and they worked
good on a tube transmitter but you will probably need 6 to go with
transistor pa deck. Adding notch stubs will help but if you have only 4
you will have a lot of desense with silicon finals, try to keep your
bottle finals going.
This is only a quickie controller, no duplexing or filtering of the rf,
if you want to test the livelyhood of a maxtrac operating continuous
duty this would be one way to try it. Before you purchase anything else
a good way to test the likelyhood of failure is use a dummy load and
keep the transmit
They are relocating to the city of Atlantis, under the water to cool
those funny circuits so the smoke won't leak out on the test bench - we
are all awaiting the new phone number and zip code as the location known
to most is extinct. Rumor has is they were the pioneers of broadband but
sold out to
There are plans on the repeater builder web site for a 440 dipole
project, just scale it to your freq. If the impedance needs to change
move the length of the spacer from the mast, if the freq doesn't land
perfect move the elements apart to go higher or closer to lower. There
must be several ways t
I am suprised 800 will show passing thru in highband cavities, I would
think moving down one rack is the smartest thing to try, as you noted it
will be a low cost trial.
> "Richard Sharp, KQ4KX" wrote:
>
> Hi gang,
>
> Our club was allowed space (no cost) on top of a 400' tower using an
> existi
ng an isolator would be prudent to prevent a high band triplen
harmonic from making it's way to the uhf rx.
Virden Clark Beckman wrote:
>
> Why mount antennas if you can't put cable on them, wait till the time is
> correct. As far as duplexing goes, you will need them tuned to oper
Why mount antennas if you can't put cable on them, wait till the time is
correct. As far as duplexing goes, you will need them tuned to operate
on your freqs. and offer enough isolation to prevent the tx from
blocking the rx, this usually is 100-120db depending on the noise levels
present in your t
First - does it work on the freqs it came with? cg=channel guard,
nb=noise blanker, if it a m-pro instead of mastr2 it will have peach
colored castings where the xtals mount and there will be 2 swing out
trays, one is the tx on top - the larger one, remove the driver tube
before trying to get the n
04 07:36 PM, Virden Clark Beckman <[EMAIL PROTECTED]> wrote:
> >This is the reason I suggest just adding a helical to the front end of
> >the regency, they really don't have evidence of a grat overlap or
> >overload unless a user has a really wide signal which sounds like it
Build something with 4166 chips and 386 op-amp, get ideas from
repeaterbuilder dot com.
bsoutheyoz wrote:
>
> Ongoing crossband repeater project requires a repeater controller
> board sourced somewhere in Australia.
>
> Have priced boards overseas where they are readily available
> but expense a
This is the reason I suggest just adding a helical to the front end of
the regency, they really don't have evidence of a grat overlap or
overload unless a user has a really wide signal which sounds like it may
be the case. In the beginning I was under the assumption it was the
output making spurs b
> Mathew
>
> - Original Message -
> From: "Virden Clark Beckman" <[EMAIL PROTECTED]>
> To:
> Sent: Tuesday, April 27, 2004 2:26 PM
> Subject: Re: [Repeater-Builder] Help on Interference
>
> > Try using the math on the IF of your rx to see wh
Try using the math on the IF of your rx to see what is making them mix
on your freq, how long have the 2 machines been co-existing on-the-air?
If it were one or 2 users you would know it rather than the entire time
the machine is active, can you see how clean the signal is from that
machine, I doub
Don't use the provided coupling, they have so little mechanical strength
the supplier won't even rate them - in every plumbing and mechanical
codebook it is mandatory to support the pipe or conduit every 10 feet,
so it makes it legal to use a 9 foot 11 inch pipe or use the whole 21
foot length as m
The mill length for pipe is 21' and both ends threaded, it arrives with
a coupling on the forward end to protect the threads from transit
damage.
"Daron J. Wilson" wrote:
>
> > >Schedule 80 2" steel will do just fine.
>
> > What is the Longest one piece it is sold in ? And is it Stronger than
>
The schedule rating of pipe is not conduit perse' as conduit does not
undergo pressure testing but it does get zinc plating, that has little
to do with your question which was aimed more at strength. I have been
serviceing electrical equipment over 20 years and have never heard of
schedule 80 offer
reg is right just there is very little range on the
> receive on the repeater. don't know is there is any alignment that can be
> done or if there is any squelch settings. I think they are all software
> done.
>
> thanks
>
> - Original Message -----
> From: "
Are you thinking of alignment, frequency adjustment or just plain
squelch?
> Maire Company wrote:
>
> does any one know if there are any adjustments on the receive of a
> MTR-2000 VHF repeater, I have poor receive on the repeater but killer
> transmit.
--
73...Clark Beckman N8PZD
Yahoo!
You know I was thinking of any possible way this might work and I
remembered something after a club meeting last night, if both antennas
were covered with a globe of shielding foil except for 10 degrees facing
opposite directions, 10 watts of output with a 100 ft. long rg-58
feedline extension, if
I think for this math we need to convert from feet and metres to db, the
theory then will show that the long and short of this queery is it is
not practical to use horizontal for FM isolation no matter how you work
the numbers not counting tx noise and rx quieting problems.
--
73...Clark Beckma
As long as you don't experience mixing troubles it will work, the method
more durable is building a mutli-coupler for the bandwidth you need -
could be done with 7/8 hardline using taps at the electrical 1/4
wavelength for each rx port, the cavity filter will be next in line -
must be kept straight
The answer lies along the diagonal lines;
http://www.repeater-builder.com/pix/vertsep.jpg and
http://www.repeater-builder.com/pix/horizsep.jpg - using the horizontal
method you will need so much bandwidth you will be into the next radio
band, like 222 and 440 or 146 and 222. This is just one of tho
They smoke a few out of every hundred built and rate them accordingly.
dy3lmk143_13mhz wrote:
>
> Transmitter and amplifier manufacturers usually specifies a duty
> cycle (i.e. 50W 100% duty cycle) on their product. then how do you
> prove what they specified is correct?
>
--
73...Clark Beckman
Try Henry, or you will need to pad down the exciter as most use 250-400
Mw in commercial service.
w9mwq wrote:
>
> I forgot, it needs to be a 5 watt drive amplifier. Thanks.
>
> Mathew
73...Clark Beckman N8PZD
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://gr
Use a flip-flop circuit. But If you have any chance for innermod you
will experience troubles galore, that is why dtmf sequences are used
rather than random pl signals.
Rich wrote:
>
> Design help needed.
>
> I'd like to take a Selectone ST138 to a maxtrac receiver in a
> Desktrac.
>
> I want i
2 continuos duty uhf radios, 2 feedline runs, 2 beam style antennas, 2
power supplies, I think I would try setting the output power at 5-7
watts first and a open radio port on each end that can be configured to
operate as you would desire, probably 2 ctcss detectors so either one
knows when the sis
I am interested also, I have 3 of these converted to 920 and was going
to dig thru stuff at dayton - I will go anyway but this will give me
more time to harass a wider area of the fly market.
Matt Krick wrote:
>
> YES! That is exactly what I am trying to do, please send away!
>
> -- Orig
A good way to reset one that has gotten this is use a big signal 5 or
10kc low and fool the agc limiter circuit, the cas will drop and come
back verifying weak signal - this works with the no-timer method also if
you have a reset tone running.
Bob Dengler wrote:
>
> At 4/10/2004 08:24 AM, you wro
13.2 is about as high as you should set anything, in vehicles with
13.8-14.0 there is typically a 20 ft cable running from the battery to
the radio mount and the voltage drops off in that length. You should
build a crowbar circuit so if the voltage climbs above 13.6 it turns off
or blows a fast act
For what band? I have a UHF tuned on 444.80/449.80 I would let out for
75 bux. It is a 4 bay sinclair that was doing 50 watts on a test machine
3 years ago.
Mike wrote:
>
> I am looking for a mobile duplexer so I can maek a portable repeater. I have
> looked on the net and I cant seem to find one
Uh, this is really good, suprisingly they don't get into much detail
about wavelengths and frequency, except some sort of telepathic
nonsense. I wonder if this is the second generation of those little
pills you could drop into your gasoline tank in the 80's and suddenly
climb mountains with the who
Exothermic is a connection not soldered, could be crimp tubes or cad
welded as used on the tops of the ground rods. It is dangerous to cad
weld up in the air - the discharge could start roofing on fire or cause
other cables and site personel trouble, I always pack around the holes
with thumb gum us
It would be smart to run a awg4 solid/bare copper wire to the top from a
wide spread grounding rod array and use this with split bolts along the
way for your antenna/s for grounding, the flange or slip joints don't
really do well after 5-8 years of oxidation and mechanical coating/paint
decay. You
Eric, you should consider this expense as that of a soldering and
schematic flow charting class - unfortunately you didn't get a passing
grade even though the instructor took time for some special attention to
help you with details. You will likely be more apt to purchase a
functioning unit or the
I think the bad hair day unit that discharges the corona is gonna be the
answer, I have built a couple and am waiting for some nice weather to
install on the top antenna where our club stuff is located.
Frank or Barb wrote:
>
> The problem we have in SW PA on 2mtrs, is rain and snow static.
> Ele
even coastal marine applications
> apply , and yes every thing is verified with swr meters , both at the
> antenna and at the back of the transmitter
> - Original Message -
> From: "Virden Clark Beckman" <[EMAIL PROTECTED]>
> To:
> Sent
Oh, don't do this - the coors brewery will have to work overtime during
the summer months when families want to vacation with the kids out of
school. I think someones eyes have swelled shut already, is the micor a
pm or fm on both ends?
--
73...Clark Beckman N8PZD
Yahoo! Groups Links
<*>
This cable is always handy for other jumpers, get several feet in case
you want to add a filter or pre-amp, it works good on wattmeter jumpers
also.
David Schornak wrote:
>
> thanks that is why I was asking I figured that everyone here would know the
> answer and give me good suggestions so I wil
Can you advise on the wind shear load and if the manufacturer will rate
it at 120 MPH so it could be used on a commercial site within 5 miles of
navigable water? Do you use an swr meter on your equipment to analyze
reflected power, how broad is the bandwidth and what stability is the
impedance at t
If you want to deter innermod you will need to use something like rg-142
which is double shielded, why bother with only having a good shield at
the connector area when the remaining cable will leak in rf like a panty
hose fire nozzle?
David Schornak wrote:
>
> thanks all for the info i Have found
It isn't clear from the picture what the little arm does out in front,
but the conversion van style uses a thermal reset, no handles or
anything to touch at all - when it cools down it will reset itself, if
the fault still exists it will heat and open again and again like a turn
signal flasher.
Do
If they are going to stay with 2 antennas use diamond x50 for tx, or
full duplex - the ringo anything won't work well in duplex because there
is an imaginary counterpoise formed by the gauss at one specific freq,
not more than one.
ki5fw wrote:
>
> A local amateur radio club needs to do some ante
What does the spectrum noise sound or look like? are you using any
pre-amp? try taking it away, adding pl will not fix this only mask it
making other problems show up, you need to get the radio working
on-the-air before you add features like ctcss. Can you df the source of
the offending signal or i
Oh, then you want a thermal reset breaker which NAPA stores sell for
universal use, costs around ten bux, I put one in for my battery
isolator in my travel van. If you are far away from NAPA try a camping
store that sells generator equipment.
Don wrote:
>
> I should of Worded that differently,
Don, tell them you want a charlton heston fog lamp relay, if it is a
bosch unit it will indicate 40A melted into the plastic and will work
fine except the micor uses different voltage levels, 9.6 and 12 - there
was a discussion about this last autumn comparing the moto family to
some other that onl
ater-Builder@yahoogroups.com
> >Subject: Re: [Repeater-Builder] ICOM H16T ACCESS CODE
> >Date: Sat, 03 Apr 2004 22:32:19 -0800
> >
> >I think it should be, 1 5 9 3 5 7
> >Johnny
> >
> >
> >Virden Clark Beckman wrote:
> > > I have a u16, to get to p
I have a u16, to get to program hold the f key on the side and press
1,5,9,7,5,3 then turn off and on to go back to run the radio.
Joey Diaz wrote:
>
> Hi,
>
> I have an old ICOM IC-H16T. I have not used this unit for a long time. I
> would like to ask for assistance regarding the access code
You will probably want to add about 1/2 inch to each end of each loop,
this will be tedious but a short time ago on the reflector someone
posted pictures of drilling thru the end of the loop and adding a bolt
to effectively increase the size of the loop, it was a high band model
but the same idea a
Well, I am thinking that using an op-amp circuit might help you out on
the audio line out with a .3-.5 blocking cap in series with a 50k pot.
Op-amps demand very little current to activate, and can be reliable in
rf fields by sprinkling some 0.1 tantalum caps around where there is dc
bus voltages n
If what you are trying to get is a stronger signal from a weaker one,
use an open npn collector as the switch - in order for it to trigger
with reliability you do need for the signal to go above 3 and below 2
volts for this to occur - it takes the strain off the radio electronics
and you can also a
You need to get a licensed radio tech in there to do the co-ordination
but the basic can it be linked, yes but it could easily cost 25-38k to
erect the towers and all the stuff needed.
Matt Bergum wrote:
>
> Hello,
>
> I just Joined the group, but don't plan to stay a member (since I am
> not a
Inexperienced repair crew, needs to work as radio apprentice aprox. 3 or
4 years before opening locked cabinets without supervision. There is a
slight chance the gr300 is inside a breakfast kitchen or railroad galley
but I am thinking the earlier diagnosis is closer.
wp3tm88 wrote:
>
> hi i have
Tune them each seperatly and then replace the cables with the correct
electrical length using the velocity factor math.
"Davies, Doug A FOR:EX" wrote:
>
> I have been having a heck of a time getting my Q202G to tune to 146.xxx. It
> was originally set up for 163.xxx and, of course, the plunger r
If you are looking for 6 mtr cavities, I have a set in my barn that a
club spent 800 bux on, 4 pcs. db 4032 - located just west of Cleveland,
Ohio - they will fit into a caravan or comparable mini-van.
Neal Newman wrote:
>
> Hey Alex Go Away
> looking for some 6 meter duplexers For al
I doubt if you would get repeater council approval to link at that power
level, most linking is done 15-20 miles with 3-5 watts and then someone
might turn it up to 10 watts to overcome foliage and insure a reliable
path in horrible weather.
dy3lmk143_13mhz wrote:
>
> I've never had experience on
This formula is in the novice and tech books for ham radio licensing,
coaxial velocity factoring.
"Daron J. Wilson" wrote:
>
> > Is there a formula to calculate the cable legnth between duplexer
> > cans? I find reference to the formula for the cable legnth coming
> > from the duplexer to the TX-
For the bux the hustler g-6 family has been doing pretty well, just make
sure to sweep it before you mount it as there have been some really
crazy uhf splits mixed up lately.
Donnie Q wrote:
>
> I am putting a 220 machine on the air in Michigan, all ready have
> the pair. but my question is does
I think if you wrap up as much as possible with foil from the kitchen
and attach clips to the foil and the motor block you could solve the
noise - this is how the high perf race cars do it, it looks funny but it
helps with wireless helmet mics and all.
Chuck Kelsey wrote:
>
> Have not seen that a
The db 4032 cavity filters are 66 inches long and 14 inches around, I
have a 4 pak of them and they work well for a tube pa but not enough
isolation for a transistor final. The loops are 12 inches long and there
are 2 used in the same upper end of the cavity filter, I guess that will
give you a sta
They or somethin very close made the uniden regency bearcat scanner
stuff, maybe cb - you are talking those 11 meter am boxes right?
Neil McKie wrote:
>
> Doesn't / didn't regency make scanners and CB's?
>
--
73...Clark Beckman N8PZD
Yahoo! Groups Links
<*> To visit your group on the
Can you send some specs for those solid state tubes?
Mathew Quaife wrote:
>
> This one has the three small transistorized finals on the right back side.
> As far as numbers on the unit, don't find anything that meets the model
> numbers that's been mentioned. Might be easier to just locate one o
Doug, your concerns about the line voltage is a valid one however the
ferro-resonant type supplies can generally overcome 10-15 percent
fluctuation in line voltage. I like your grounding questions and using a
split bolt to add your 6awg stranded wire to the existing ground bus is
going to be as goo
they are
> and how they work. I wanna stack two 5/8 wave elements vertically
> using collinear model or stack array. Thank you.
> --- In Repeater-Builder@yahoogroups.com, Virden Clark Beckman
> <[EMAIL PROTECTED]> wrote:
> > What angle of radiation are you measuring gain in
What angle of radiation are you measuring gain in? What method of
coupling are you using between the radiating elements?
samsoncr wrote:
>
> Hi. I wanna make an antenna stacking two 5/8 elements, it's for my
> GMRS radio. Which one will have more gain, 40,5 cm over 40,5 cm
> element with 2 cm of
Make sure the ceramic plate on front and the insulating spacer in the
back are in good condition and gooped up with heat transfer compound, if
either part is faulty the voltage goes down to zero and hops up and down
when you wiggle the frame and or the cover.
Terry wrote:
>
> Hey folks,
>
Get onto an existing tower as a co-located user, you will be meeting a
lot of people to explain the volunteer support ham radio gives existing
emergency services when they are overloaded - cell phones don't go fast
enough - electrical outage in one area puts an end to communications
between the ins
There is a tube store in Tempe Arizona that has fair prices on new old
stock tubes, I think it is called radio restoration or something close -
before you chase good money for new why not buy another mobile radio at
a swap-n-shop? Or dig into a 2way shop's castaway pile to see what you
can discover
The white one from the cellphone shack (read radio shack) kit is the
most popular size for twisting the coil slugs, if you find a stubborn
one drip in a couple drops of kerosene to soften the wax. I just noticed
Hamtronics has something like it in the clearance section, I am sure
someone else will
Before you get curious about the voltage levels in the transmit strip,
first check that the bleeder resistors are actually not burnt open, they
are the 2 watt resistors on the circuit board that holds the diodes -
these fail over time and will probably crack from transit, with a
voltmeter over the
I would imagine you might want to bid on 4 that I have belongs to a
radio club in northern Ohio - they paid 800 bux and they worked good
until we split the site with the solid state pa deck. There is info on
adding a pass notch out of cable to the inside somewhere on the web, I
wanted to try this a
This is a good example, don't do what you just thought about doing - you
will ruin the rx radio set. Before you transmit into the cavity filter
be sure it has some isolation to the rx port, this is a must... Now how
can you test this? Try a little extra isolation - don't connect direct,
huh? what i
Tedd Doda wrote:
>
> An oscilloscope is your best friend for tracking logic
> and audio levels.
Snip --> In many cases you can use a volt meter to observe the .2 ac in
the audio stream to the controller rxa in this case taken from tb502-2.
But again be careful when you grab that cas line from tb
GE M-pro pin out on the top of the power supply there are 2 terminal
strips tb501 and tb 502, tb502-2=rxa, tb502-10=ptt/lo, tb502-12=txa,
tb502-16=cas/hi - the cas is next to 110vac so be really smart and pull
the plug from the wall before you tinker with that one.
Russell Filling wrote:
>
> ok
This is typically done to protect the seller from someone not familiar
with the equipment from shooting both in the foot from one location,
shoot yourself in the foot alone. This is why most electronic equipment
is sold as is, however if you run into trouble Paul is a very helpful
guy and can offer
Programmable duplexors? Is this an upside down 2L0h sumthing? I think we
need a physical description on this. What freq. is it on now and where
do you want to move it? If it is a duplexor they can be tuned at a radio
shop with a network analyzer, and then will probably have to be fine
tuned at the
Hey Chuck, have they started a j-pole antenna group yet? That would be a
fascinating one to watch, if you include 432 I will join.
Chuck Kelsey wrote:
>
> I guess that the Repeater Builder list was so overwhelmed with Mitrek stuff
> that it was inevitable that another list would be needed.
>
> I
I have one of the micors like you are using, same gas-fet, dci 4 bay
filter and duplexor also. The gas-fet is the single biggest item of
gain, and would mention if you have easy access try changing just that
to a bi-polar and do only one thing at a time because without being
there it is hard to say
Roger, is this the replacement for the ICC AM-6154 and 6155 series
equipment? I have one of each and besides a couple early smokes tests
they work well in the 6-700 watt range after mods.
[EMAIL PROTECTED] wrote:
>
> the CM-51 is a UHF (225-400 MHz)LPA designed to boost AM signals from 10
> watt
I geuss we couldn't wait till the first day in April for that news?
"Jim B." wrote:
>
> [EMAIL PROTECTED] wrote:
>
> > Hi Jim,
> >
> >
> >>For repeater duty, it MUST be turned down or it will burn up.
> >
> >
> > And conversely, it mustn't be turned up or it will burn down.
> >
> > 73,
> > Bob
>
Look for the white wire to cycle with the correct tone, this is rx pl
detect - you didn't say if the unit will rx with any tone but you didn't
say the rx has died so that sounds like the symptom. If you have the
green wire going to vol/squ hi and the org, blk and violet held low and
the white wire
That will be a rare catch - the micor ones are 2 helical and bi-polar,
also scarce.
"Adam T. Cately" wrote:
>
>Looking for a Mastr II UHS amp for VHF - have receiver boards, but
> would take another with the amp installed for the right price. Please
> respond to:
>
>[EMAIL PROTECTED]
>
Analog meaning 1.6 volts represents 1.6 volts to the controller and it
can be programmed to act on 1.5, 1.6 and 1.7 volts differently unlike
digital where above 4.5 volts is on and below 3.x is off. ACC which has
gone away almost 10 years and link which took over the stock and makes
something simil
The voice unit is in the kenwood right? Yes if you can sit there with
the remote microphone and push all the buttons at the correct time it
would work.
"Jeremy W. Hopkins" wrote:
>
> what about using the voice synthesizer to confirm freq?
>
> - Original Message -
Stephen, the acc controller and link are the only ham radio type
controllers that can process analog data. You would have to make an
interface with a basic stamp or some from of digital-analog convertor to
interact between the scom and the radio itself.
kg4pto wrote:
>
> I have a general question
Change the programming to your desired timing sequence, what is an old
repeater? In many ham radio conversions the controller is not made by
the radio company, so you will have to examine the board for a name if
you didn't get all the info when you aquired the unit. There are still
some controllers
Conducting boom is ok but not spreaders, if you are a purist you will
find feedpoint impedance ranging from 75 to 300 ohms - use some 1/2
electrical wave length of inversion coax to return to 52 ohm for your
transmitter to enjoy.
> Sandeep wrote:
>
> Hi
> this is off topic
> I am planning a 2M cu
It has been done and it must be side braced, the original build from DB
uses a much larger base mast for the high band segment which holds the
uhf unit above. I didn't think this was still being built, it is a great
performer - basically you are getting 2 650bux dipoles on a stronger
mast - even if
For commercial tower installation watch those wind load numbers, most
towers want a 90-100+ wind load, 120+ within 5 miles of navigable water.
As far as efficiency goes there is no such thing as a multi-band
antenna, the ham patterns are generally so high on the horizon that you
would need a good a
The zmatcher matches the reactive impedance to the transmitter, not the
resistive load - any cable changes or anything will affect this
reactance.
Ralph Mowery wrote:
>
> > Couldn't agree with you more. The important point is that you can't
> insert
> > an SWR meter or wattmeter in the line to m
Just the lowest power supply drain, when you do this into the installed
system you can then insert a wattmeter and adjust the output as desired,
probably on a station heat sink to 98 percent rated output. It has been
mentioned sporadically here about the isolator/circulator as an
additional benefit
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