开云体育

I have a GE master 2 vhf mobile and would like to know what needs to be done
to convert this radio to a 220 repeater, oh can not forget a basic controller also
I am also looking for a 222 mobile radio at a fair price

Thank you,
Action

****
* Get your FREE e-mail and FREE web site at FIBERIA *
* *
****

In a message dated 4/30/1999 6:20:31 AM Eastern Daylight Time, WA2MMX@...
writes:

<<
Loose the 75 ohm cable and get some hardline, 50 ohms.......no RG8 or any of
that type of coax. You need double shielded or hardline......
>>


Thanx for the advise, however, I remeasured, and I am using about 50 feet
of the stuff. I Live on the 6 floor of the building, whcih is the top floor,
and the antenna is on the roof up 20 feet on a steel pipe. I was under the
impression that 75 ohn cable was acceptable, however, I plan on getting some
either RG8, although I have some 1/2 inch coax laying around that I may
attempt to use. Thanx for all the good advice, I plan on attempting all of
them.

Thanx
Mike

Loose the 75 ohm cable and get some hardline, 50 ohms.......no RG8 or any of
that type of coax. You need double shielded or hardline......

LOOSE THE 75ohm CABLE THEY NEED (50)ohm cable!!!!!!!!

if some has a manual for this panal please let me know csi-32 community tone panal
thanks jimmy

Hi Matt.

We have used three RC-1000 controllers and never had a problem with bad
audio. The RC-1000 requires processed, de-emphasized, audio. From what you
are describing it is possible that you may be taking the audio from a point
in the receiver before the de-emphasis circuit. As your TX audio circuit
does pre-emphasis again, you now have it twice and the result is harsh tinny
audio. Try to find a point where the audio is de-emphasized and see what
the result is.

Tony VE3DWI
**

Robert D. Mantell wrote:

Your first step would be to read all available information on duplexor
technology. The RSGB book is a good source of info. You should also
contact a manufacturer like WACOM Products and request all of their
literature. They may be reached by e-mail: wacom@...
You should scan back through the Repeater-builder list-serv posting
for further info.
If you have access to inexpensive materials, building your own is
an option. Another option is to use two sites spaced far enough
from each other that no cavities are required. They may be linked
by wire or qrp radio. Please keep us informed of your progress

Good luck and vy 73.

Bob - W3TGG

Hi, Bob,

Thanks you very much for your answer. Sorry, we have not two sites to
make repeater, only a little place in a tower of my job.
Tnx Bob, and my best wishes!
Tibor HA1US

Not to bust any chops, but I think you're looking in the wrong area if
you're thinking cable TV interference or UFOs or whatever. Back up a step
or two and analyze the whole system.

You are using a suitcase repeater with two handheld radios connected to a
power supply. The power supply seems to have enough amperage to supply the
two radios if it is rated at 35A. However the two handhelds don't have a
lot of power filtering capabilities by themselves. How old is the power
supply? If the supply is old and the capacitors are shot, you might think
about replacing them or using a newer replacement supply and see if your hum
goes away. Is your hum a buzz or solid tone? Hint: you might have a power
supply problem if you're hearing a low tone - like 60 Hz - which is your
line frequency.

Ditch the 75 ohm coax. You have no idea if the line is good or bad since it
is surplus. If you have an extremely long length and are literally
hoseclamping PL-259s to the feedline (I've done that too), the VSWR readings
may be false - something I found out the hard way. Go get some new stuff,
heck, even RG-8X is better than what you have at this point. 6 stories of
bad coax is bad news. Also get some new connectors and put them on
correctly.

Let's look at the antenna system starting at the duplexer. You are no doubt
using a mobile duplexer and they don't provide much filtering between the
transmitter and the receiver to start with, and even then, they are
typically designed to operate 5 MHz splits. If you're trying to use it with
a 600 KHz split, you're asking for trouble! You may be getting RF back into
the receiver - your hum.

Now let's examine the antenna. The Ringo Ranger is not a great antenna, but
it's not going to create hum. Do get a good DC-grounded antenna, even if it
is a ground plane type up on a mast, but the skirt is grounded to the mast,
etc. How high up is the antenna? I have assumed that you are using 2 meter
frequencies again, and like any VHF or UHF bands, they rely mainly on line
of sight for propagation. The higher you get the antenna, the better range
you will get. Any hills or big buildings in the way? If so, you're going
to have some blocking effects.

I hope I haven't confused you totally, but think of the whole picture - a
complete communications system - and disect it accordingly. You'll find the
problem!

Todd Ellis, N2XL
Operations Manager,
Telecommunications Division
Booth & Associates, Inc.
1011 Schaub Drive
Raleigh, NC 27606
Tel: (919) 851-8770
Fax: (919) 859-5918
E-mail: ellistr@...

I got a Hamtronics CWID-2 board and it has the 2732Q erpm on it. I have done this before with similiar iders like this in fact I have a basic program that you enter the freq. and it write a bin dile to write to the eprom. On this one it don't seem to be the same format.

Has anyone reprogrammed this eprom or know how to edit the one? I tried to edit what I read off it but it seems someone has tried this before and messed up the format.

Sam, wm4t

I got a Hamtronics CWID-2 board and it has the 2732Q erpm on it. I have done this before with similiar iders like this in fact I have a basic program that you enter the freq. and it write a bin dile to write to the eprom. On this one it don't seem to be the same format.

Has anyone reprogrammed this eprom or know how to edit the one? I tried to edit what I read off it but it seems someone has tried this before and messed up the format.

Sam, wm4t

HQ54@... wrote:

From: HQ54@...

Hi All,

I was wondering if any one could help me with a problem I am haing with
my repeater. I am currently using a Motorola Suitcase Repeater, basically
based on the MX series of portables, this unit is fully self contained with
high power PA, mobile type duplexer, repeater controler, and even a power
supply (OF which I am not currently using, I am using an Astron 35amp unit)
I am also using about 50 feet of LOW loss 75 ohm coax that I got from the
Cable Company, however, I am unsure of the exact type of cable, RG6 or RG11
or whatever. I am also usiung a Ringo Ranger antenna, mounted on the top of
my building 6 stories up. I know it isn't the most ideal setup, but I am
just looking for some local coverage, a couple of miles worth, maybe 3 or 4
on 5 watt portables. Now to the problem,

The unit works flawlessly when within about 7 to 10 blocks away,
however, once passed that point, or even closer when in a house, building, or
basement, the reciever opens, and stays open the entire time of the signal,
however there is a low pitched, I guess it would be called a "HUM", that
completely covers the audio of the signal. I thought that maybe it was the
duplexer, but I tested that by disabling the transmitter while recieving a
"HUMING" signal, with no improvement. I then thought it was the antenna and
the connections, but I have an SWR of about 1.4, so I wasn't that concerned
with the antenna. However, I once read somewhere that the way the Ringos
carry the RF, it wasn't good for the duplexer, so I swapped it out with an
Antenna I picked up at a hamfest, and according the literature with the
antenna, it has been successfully used with other repeaters, along with
replacing the connectors at both ends of the coax. This new antenna did
improve on the humming problem, signals that before would "HUM" didn't,
however, the antenna was physically smaller, so I lost alot of the output
gain, and the reciever wouldn't pick up signals that before it would, without
dropping out, but were humming. So, I switched back to the Ringo thinking
that maybe the connectors were the problem, however, they weren't as I am now
getting the HUM again.

I was wondering if anyone had any ideas or suggestions that might help.
I was thinking about adding a MICOR recieve preamp, thinking that maybe the
signals just aren't strong enough, and that is why I am getting them HUM, but
I think that there is something else going on.

Also, can anyone tell me, can I install the MICOR preamp in the coax that
leads from the duplexer to the reciever, or does it have to be after some
sort of reciever circuitry.

Thanx in advance for any help you may be able to provide.
Mike

------------------------------------------------------------------------
You can now easily share photos and documents with your fellow list members

Check out our homepage for details on how to use our new shared files feature!
------------------------------------------------------------------------
This list is sponsored by the owners and users of "RBTIP"



I am taking a survey, Please vote only once. Kevin

Mike,

One problem to look into is cable TV leakage in the area. You didn't
mention what frequency you were on but in the vhf range, 145.250 is the
ch 18 video sync and 4.5 up is audio, and every six megs is another
channel. We havea real problem here with this as some of the cable tv
amps are really putting out some garbage. This also can occur on uhf too
as the cable channels 57 thru appx. 64 are radiating rf that can be
beating with your receive signal. Or jsut enough to cause a little
desense and hiss when you receive a low level signal say from a handheld
etc..

Sam, wm4t

It would seem to me that the first place to start is to replace the 75
ohm coax you are using with 50 ohm coax which will properly match both
the radio and the antenna.

Don WA1PXT

mch wrote:

From: mch <mch@...>

If you have 100W output and 10W reflected power. Only 50W is getting to
your antenna due to the 3 dB loss. Of that, to produce a reflected power
of 10W at the transmitter means you must have 20W reflected at the
antenna. You have a 3 dB loss in each direction. The specific power
levels don't matter much; the ratios are the same. 50W output and 20W
reflected (at the antenna) is significantly higher than 2:1. I don't
have a chart handy, but around 9:1 sounds in the ballpark.

73,
Joe, KR3P

Joe is right, line has loss in both directions.

Kevin

Try CAS. Should work much better.

Don WA1PXT

Hello All,

Our club repeater a GE MASTER II UHF, just quit working and we decide
to replace it with another GE MASTER II or may be EXEC II radio. So
any body out there with a spare unit we will be glad to buy it and
you can help us back on the air again.

Thanks,

_______________________________________________________________
Get Free Email and Do More On The Web. Visit

Hi All,

I was wondering if any one could help me with a problem I am haing with
my repeater. I am currently using a Motorola Suitcase Repeater, basically
based on the MX series of portables, this unit is fully self contained with
high power PA, mobile type duplexer, repeater controler, and even a power
supply (OF which I am not currently using, I am using an Astron 35amp unit)
I am also using about 50 feet of LOW loss 75 ohm coax that I got from the
Cable Company, however, I am unsure of the exact type of cable, RG6 or RG11
or whatever. I am also usiung a Ringo Ranger antenna, mounted on the top of
my building 6 stories up. I know it isn't the most ideal setup, but I am
just looking for some local coverage, a couple of miles worth, maybe 3 or 4
on 5 watt portables. Now to the problem,

The unit works flawlessly when within about 7 to 10 blocks away,
however, once passed that point, or even closer when in a house, building, or
basement, the reciever opens, and stays open the entire time of the signal,
however there is a low pitched, I guess it would be called a "HUM", that
completely covers the audio of the signal. I thought that maybe it was the
duplexer, but I tested that by disabling the transmitter while recieving a
"HUMING" signal, with no improvement. I then thought it was the antenna and
the connections, but I have an SWR of about 1.4, so I wasn't that concerned
with the antenna. However, I once read somewhere that the way the Ringos
carry the RF, it wasn't good for the duplexer, so I swapped it out with an
Antenna I picked up at a hamfest, and according the literature with the
antenna, it has been successfully used with other repeaters, along with
replacing the connectors at both ends of the coax. This new antenna did
improve on the humming problem, signals that before would "HUM" didn't,
however, the antenna was physically smaller, so I lost alot of the output
gain, and the reciever wouldn't pick up signals that before it would, without
dropping out, but were humming. So, I switched back to the Ringo thinking
that maybe the connectors were the problem, however, they weren't as I am now
getting the HUM again.

I was wondering if anyone had any ideas or suggestions that might help.
I was thinking about adding a MICOR recieve preamp, thinking that maybe the
signals just aren't strong enough, and that is why I am getting them HUM, but
I think that there is something else going on.

Also, can anyone tell me, can I install the MICOR preamp in the coax that
leads from the duplexer to the reciever, or does it have to be after some
sort of reciever circuitry.

Thanx in advance for any help you may be able to provide.
Mike

contact gene diehl via phone at 219-495-5715 after 1200 hours or email
n9lcf@... snail mail is 4705 n 725 e fremont, indiana
46737







At 02:06 AM 4/29/99 PDT, you wrote:

From: " " <dx_ing@...>

Hello All,

Our club repeater a GE MASTER II UHF, just quit working and we decide
to replace it with another GE MASTER II or may be EXEC II radio. So
any body out there with a spare unit we will be glad to buy it and
you can help us back on the air again.

Thanks,

_______________________________________________________________
Get Free Email and Do More On The Web. Visit

------------------------------------------------------------------------
You can now easily share photos and documents with your fellow list members

Check out our homepage for details on how to use our new shared files

feature!

------------------------------------------------------------------------
This list is sponsored by the owners and users of "RBTIP"



I am taking a survey, Please vote only once. Kevin

We are trying to make an older model RC-1000 controller by MicroComputer
Concepte work with a VHF Micor. The audio sounds very harsh and tinny.
Anyone have any experience or advice to make the repeat audio sound better?

Thanks for the ideas!

-Matt

Sounds like an emphasis/de-emphasis problem. Seems to me years back I had a
similar problem, if the audio was
taken off the discriminator, feed it back into the pl input.
Flat audio out, flat audio in.

Seems to me that solved the problem.

Terry VE6TDW

Tony Lelieveld wrote:

Whatever the negative aspects, I'd give it a try anyway. If your TX
can handle the 2:1 VSWR it may just work. The antenna may not be as
effective when off tune by the amount you indicated but you have the
height. 2:1 VSWR is still 88.9% of the power being transmitted and
11.1 % being reflected.

Original message:

I acquired a 2 bay, 6 meter Sinclair antenna at our main
repeater site. It was tuned for 45 Mhz and that was verified
by checking the return loss. At my 6 meter repeater output,
the return loss is about -10 db (a little over 2:1 SWR).

If 10% (-10 dB) of the power is being reflected back at the transmitter
and not the antenna, you need to consider line loss. You said the
feedline is nearly 500 feet, and at 50 MHz, 1/2" heliax (which is what I
believe you said you were using) has approximately a 0.5 dB loss per
hundred feet, or approximately 2.5 dB over the entire run. For arguments
sake, let's call it 3 dB.

If you have 100W output and 10W reflected power. Only 50W is getting to
your antenna due to the 3 dB loss. Of that, to produce a reflected power
of 10W at the transmitter means you must have 20W reflected at the
antenna. You have a 3 dB loss in each direction. The specific power
levels don't matter much; the ratios are the same. 50W output and 20W
reflected (at the antenna) is significantly higher than 2:1. I don't
have a chart handy, but around 9:1 sounds in the ballpark.

For a good SWR (1.5:1) with 100W output, you should see no more than 1W
of reflected power with the losses that you have. (50W at the antenna
with 2W reflected at the antenna)

73,
Joe, KR3P

Hi Fellow Hams,
I just acquired a Master II Repeater and interfacing a Cat 300 DX
controller to it. I have everything done except I wish to use the
RUS line for COR input. The RUS line goes high for a split second till
the exciter keys and then goes low. There must be another place to pick
up RUS that will stay high as long as the receiver is unsqelched. I am
hoping that someone knows of this location. Using the RUS as COR is in
light of having mobil flutter problems on a previous converted Master II
mobile.
Another thing that I need is where to pick up a CTCSS output from the
factory G.E. pl board. I need to go high on a line when P.L. is
present. I didn't find anywhere on the backplane that gave me this.
Any help would be apperciated very much. Thanks, Tom Butler, N5KWN..