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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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Re: ge radios
Charles D. Miller
* REPLY SEPARATOR *
On 4/27/99 at 11:37 PM mike dewaele wrote: From: "mike dewaele" <mdewaele@...>silver handle??? YES and if so did you have spurs and general noise on the rfoutput??? YES Good Luck, Charles D. Miller E-Mail: cdmiller@... |
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RLC-4
"Ray Rosler" <[email protected]
Hi we are having a small problem trying to understand how program the link RLC-4 controller with the firmware 1.78 and 1.79. Is there some who has used this controller with the mentioned firm ware. We wish to use a auto phone patch, dvr voice recorder. Can anyone help us out.
thanks Ray e-mail roslr@... |
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Re: WANTED:ALIGNMENT PROCEDURE FOR MX SERIES PORTABLE
In a message dated 4/27/1999 11:31:12 PM Eastern Daylight Time,
mcsalem@... writes: << Mike: I had to stop and think for a minute since it has been some time since I tuned up an MX, but there really is not much to do to tune up the transmitter. For the later versions of these radios, Motorola made a separate service manual and a troubleshooting manual. Tune up instructions are in the service manual. I do not have a service manual for a crystal controlled MX, but do have tuneup instructions for a PX-300 crystal controlled which is the PT version and also manuals for the PX-300-S. I have service manuals for the UHF and VHF MX radios. For the crystal controlled PX (MX), the tuneup instructions start with R107 which sets the power. Then you set the channel elements on frequency, CE101 to CE108. Then you adjust R102 for deviation with a tone in the microphone. If it is a synthesized model, you have to set the VCO by tuning the radio to the highest and lowest frequency and measure the voltage at Pin 12 of U14. For the UHF radio, the high frequency control voltage should be set no higher than 4.8 volts. For the lowest frequency, the control voltage should be set no less than 1.8 V. The adjustment is to L4. You should also check this for the highest and lowest frequency for the receiver and make sure that the voltage is in the same range. As a practical matter, I found that the VCO would lock from 1.0 V to 7.0 volts, but I suspect that it would not cover the temperature range of the radio. I would set it right in the ham bands and use the upper end to reach into the public service frequencies to monitor and not program the transmitter. For VHF, the voltage range is 1.4 Volts low and 4.75 volts on high. The coil adjustment and pin 12 of U14 is the same. After this, you set the frequency and adjust R107 for the appropriate power level: 1.0 Watt, 2.5 Watts, and 6 watts for VHF and 1.0 Watts, 2.0 Watts, and 5.0 Watts for UHF. I hope this is helpful. 73 Micheal Salem N5MS >> Thanx, it is very helpfull. Mike |
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Re: ge master 2 radio
hello,
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could you send me the "numbers" of this radio please? thanks. -- rick ----- Original Message -----
From: tom oliver <tsoliver@...> To: <Repeater-builder@...>; mike dewaele <mdewaele@...> Sent: Tuesday, April 27, 1999 22:53 PM Subject: [Repeater-builder] Re: ge master 2 radio From: tom oliver <tsoliver@...>channel element and the radio has factory uhs primp in it checked working.$125.00 plus shippingin own box)part onwith at a resonable price.....my vhf repeater is done and ready to start uhf....only looking for master 2 ..... |
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Re: ge master 2 radio
tom oliver
I have a brown handle 450 mhz mastrII 60 watt comes with one of each channel
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element and the radio has factory uhs primp in it checked working. $125.00 plus shipping cable and control head / mic/speaker $25.00 includes shipping (will ship in own box) tom n8ies mike dewaele wrote: From: "mike dewaele" <mdewaele@...> |
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