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Re: G.E. Master II Repeater Interface Problem
T.E. Butler
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.. |
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Re: Help w/ RC-1000 Audio
David Rust
I used a 1 uf in mine also. Sounds great, I dont remember for sure but
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there may be a small voltage on this line. I have found experimenting with capacity in line with about all the connections will work wonders. I have an RC1000 and 2 of the less expensive ones, and they all work great. ----- Original Message -----
From: John <auburn@...> To: <Repeater-builder@...> Sent: Wednesday, April 28, 1999 8:17 PM Subject: [Repeater-builder] Re: Help w/ RC-1000 Audio From: "John" <auburn@...>it have an impedance selector? If so, set it to low. Also, is there an output |
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Re: Help w/ RC-1000 Audio
Brent DeSalvo KF4TNP
believe it or not i have used a 2.2k resistor in-series with the rx audio lead
and the controller and from the point where the audio lead from the radio and the resistor is i tied a .055 uf cap to ground it fixed the problem on my micor odd value but it worked and sounds pretty good i use the standard c558a ht to work the repeater and it sounds just like my ht on simplex others may have other fixes but u may want to experiment with the values Matthew Janusauskas wrote: From: Matthew Janusauskas <w21@...>-- Brent DeSalvo (KF4TNP) Grid Square: EM65 ICQ UIN# : 17430698 Mailto:bug1@... |
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Re: Help w/ RC-1000 Audio
John
Where are you injecting the audio? Mic input? PL input? Try the other, try
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using a cap in series, like 1 uf or so... I'm not familiar with the options for configuration on the RC-1000; does it have an impedance selector? If so, set it to low. Also, is there an output range selector? Hi or low level? 73, John NI0K ----- Original Message ----- >
We are trying to make an older model RC-1000 controller by MicroComputerbetter? |
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Fw: Using Antenna tuners?
"Tony Lelieveld" <[email protected]
Ted.
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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. Gd. luck .. 73 Tony VE3DWI -----Original Message-----
From: Tedd Doda <lazer@...> To: Repeater list <repeater-builder@...> Date: April 27, 1999 22:26 Subject: [Repeater-builder] Using Antenna tuners? From: "Tedd Doda" <lazer@...>feature! ------------------------------------------------------------------------ |
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Re: Help w/ RC-1000 Audio
In a message dated 99-04-28 20:57:34 EDT, Matthew Janusauskas
<w21@...> wrote: << Hi group, 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? >> One thing we did with some RC1000's we've used here in Raleigh (mostly as short-term controllers 'til we can upgrade to something with more features) was to replace ALL of the tantalum electrolytic capacitors with same value, non-polarized. I was fortunate to have a friend who could get me engineering samples of a ceramic-type, in just about the same physical size. What I had learned was that tantalum caps, while normally very 'capacitive' for its size, do not do well with >passing< audio. And it was made even worse the day I was doing some work on the controller and managaed to key up the HT too close to the controller board. It basically fried the tantalums. This was confirmed by an other tech in an engineering design department that tantalums do fry with too much RF. Made the audio icky-poo, for lack of a better term. Very distorted. Can't remember if there was a hi-freq. or low freq. effect. Just that it happened. Replaced said tant's with the others, audio became more wonderful. Ron does a nice controller for the price. It's response to programming commands leaves a bit to be desired, but for getting on the air, cheap, with a patch, it's OK. Chuk Gleason kb4mdz |
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Re: Using Antenna tuners?
Tedd Doda
On Wed, 28 Apr 1999 12:15:06 -0400, Ed Bathgate, RMA Repair Dept x8785 wrote:
Well, that will make for an interesting experiment.My feeling exactly! We have a rigger coming to change our VHF antenna and feedline at the same site (different tower), so I may ask him how much he would charge just to install a shorting strap on each dipole (can't make it much worse, hi). Tedd Doda CET CEO Lazer Audio and Electronics packet ve3tjd@va3sed e-mail lazer@... |
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Re: Using Antenna tuners?
Carl Di Paolo
Tedd Doda wrote:
I wonder about the use of a shorting strap. We use VHF loops (DB-224)from commercial stuff on 2 meters by adding a stub on the end of the loop. So the total length is what counts. If you strap the loop, it may go up in freq, but I bet not much. Unfortunately, the loops are probably frozen and can not be smacked shorter. Good luck, I do not want to rain on the parade, but it may be worth trying on the ground first, this one knows how much to "strap short" or shorten the elements 73 carl w7exh |
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Re: Using Antenna tuners?
Tedd Doda
On Wed, 28 Apr 1999 09:17:47 -0400, Ed Bathgate, RMA Repair Dept x8785 wrote:
How high is the antenna? Is it feasible to get it down and trim it to theThe antenna is 400 feet up, on the side of a 600+ foot tower. We were contemplating getting a rigger up and at least put a shorting bar on the dipoles, but the TV station is replacing the Tower within the next 3 years and we (the club) can't justify it at this time. How much feedline is between the ant and the tuner???It's 1/2" Andrews Heliax, and from the antenna to the shack I would say maybe about 475 feet? The shack is about 75 feet from the tower, plus the 400 feet to the antenna. Your feedline isAgreed. I guess we'll find out this weekend. It will only cost us a few man hours to reroute the heliax. Tedd Doda CET CEO Lazer Audio and Electronics packet ve3tjd@va3sed e-mail lazer@... |
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Re: Using Antenna tuners?
Tedd Doda
On Wed, 28 Apr 1999 08:22:57 -0400, DPW wrote:
And if I might add... I would run a circulator and harmonic filter onDo they make circulators for 6 meters? Tedd Doda CET CEO Lazer Audio and Electronics packet ve3tjd@va3sed e-mail lazer@... |
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Re: Using Antenna tuners?
Tedd Doda
On Wed, 28 Apr 1999 06:44:01 -0500, John wrote:
Gain is also a function of frequency. You can suffer the loss in a matchingYes, I agree. But Gain is also a function of height, and this thing is 400 feet higher than my Ringo, hi! I guess we'll find out how the Mastr II likes SWR's of 2 to 1 this weekend, after we reroute the Heliax to our shack. I presume you meant that you would avoid the antenna? Tedd Doda CET CEO Lazer Audio and Electronics packet ve3tjd@va3sed e-mail lazer@... |
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Re: Using Antenna tuners?
Ed Bathgate, RMA Repair Dept x8785
Tedd says:
The antenna is 400 feet up, on the side of a 600+ foot tower.Well, that will make for an interesting experiment. I would agree to use a tuner between the feedline and the repeater. My suggestion would be to tune for lowest tx swr. You probably will lose some on the rx, but bad sensitivity is easier to live with than fried PA transistors! 73 & good luck! Ed N3SDO Ed Bathgate RMA Dept (724) 772-8785 pager (412) 649-6773 |
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Re: ge radios
John Lloyd
Mike,
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Stay away from that silver handled version. Yes, they are problems. John, K7JL mike dewaele wrote: From: "mike dewaele" <mdewaele@...> |
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Re: Using Antenna tuners?
Ed Bathgate, RMA Repair Dept x8785
How high is the antenna? Is it feasible to get it down and trim it to the
correct freq? How much feedline is between the ant and the tuner??? Your feedline is going to increase its loss if the swr is high. That in and of itself may make the antenna gain zero or lossy! $.02 Ed N3SDO Gain is also a function of frequency. You can suffer the loss in a matching Ed Bathgate RMA Dept (724) 772-8785 pager (412) 649-6773 |
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Re: using antenna tuner
I tried this recently with a 6M transmitter trying to feed an ant. WAY up on a TV tower. Got the SWR down but the thing would not radiate at all. Don't worry about the receive, it might not even transmit! This ant. was however much further away from the transmit frequency than yours is.
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Re: Using Antenna tuners?
DPW
And if I might add... I would run a circulator and harmonic filter on
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this one, especially if you run a solid state PA. David John wrote:
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Re: Using Antenna tuners?
John
Tedd:
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Gain is also a function of frequency. You can suffer the loss in a matching network, but your antenna gain will be lower, too. I wouldn't recommend it unless you have no other choice. John NI0K ----- Original Message ----- >
I acquired a 2 bay, 6 meter Sinclair antenna at our main |
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