Re: [Repeater-Builder] Re: Micor oscillator mod question

[mch]

Increased stability. I did that with a Hamstronics unit, but it wasn't
putting out 400 mW. You could hear the iscillator running on-site, but
nowhere else.

Joe M.

twoway_tech wrote:
 
 So,is there any point to leaving the oscillator on all the time?
 
 jordan
 
 --- In Repeater-Builder@yahoogroups.com, Kevin Custer [EMAIL PROTECTED] 
 wrote:
 
  twoway_tech wrote:
   I just modified my micor UHF for the exciter to be on all of the time.
   I am not for sure that I really like this mod. The oscillator   signal
   seems to carry pretty far. Can someone tell me exactly what is gained
   by wiring the exciter to be on all of the time. Is it just for faster
   transmit response time?
   Thanks  I'm sure there will be more questions to come!
 
  Station?   We use the (unused) antenna switch logic (on the SCM) to
  control the channel element ground.
  Works great, less filling...
 
  Kevin
 
 
 
 Yahoo! Groups Links
 
 
 

Re: [Repeater-Builder] Re: Micor oscillator mod question

[Scott Zimmerman]

Jordan,

Joe answered your question accurately. The benefit of running the oscillator 
all the time is stability. It won't hurt anything to have the oscillator 
running all the time as long as the exciter is not keyed (Keyed A+ active)

I often *must* keep the channel element running on my 220 true FM 
conversions. All the audio stages are DC capacitively coupled with 
relatively LARGE value capacitors. If I don't keep the osc. running all the 
time, the frequency swoops when the exciter is keyed until all the 
capacitors charge to their stable resting voltages. Once you unkey the caps 
discharge again and the whole process repeats the next time the exciter is 
keyed. Keeping the channel element and first stage running all the time 
eliminates this problem. The only annoyance is that you can hear the 
oscillator running when you are within a few hundred yards of the site (It's 
just amazing how far a little power will go!!!)

In *most* situations there is no advantage either way. (running at all times 
or not) If hearing the oscillator running all the time bugs you, do the 
keying mod. If not, don't worry about it.

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
612 Barnett Rd
Boswell, PA 15531

- Original Message - 
From: twoway_tech [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, May 29, 2007 5:56 PM
Subject: [Repeater-Builder] Re: Micor oscillator mod question



 So,is there any point to leaving the oscillator on all the time?

 jordan

 --- In Repeater-Builder@yahoogroups.com, Kevin Custer [EMAIL PROTECTED] 
 wrote:

 twoway_tech wrote:
  I just modified my micor UHF for the exciter to be on all of the time.
  I am not for sure that I really like this mod. The oscillator   signal
  seems to carry pretty far. Can someone tell me exactly what is gained
  by wiring the exciter to be on all of the time. Is it just for faster
  transmit response time?
  Thanks  I'm sure there will be more questions to come!

 Station?   We use the (unused) antenna switch logic (on the SCM) to
 control the channel element ground.
 Works great, less filling...

 Kevin








 Yahoo! Groups Links





 -- 
 No virus found in this incoming message.
 Checked by AVG Free Edition.
 Version: 7.5.472 / Virus Database: 269.8.3/824 - Release Date: 5/29/2007 
 1:01 PM

 

Re: [Repeater-Builder] Re: Micor oscillator mod question

[Kuggie]

 Sorry for the confusion... Maybe I wasn't very clear on my post. First
  of all, my Micor is a repeater station, unified chassis. 
 
 
 I performed this mod: 
 
 SNIP 
 
 
 
  SO NO, the exciter itself is not on until the repeater is keyed up..
 I have a bird amp; dummy load on the exciter (no PA) and I have about 2.5
 Watts out when the repeater is keyed up. BUT with the mod in place, I
 have no power out to the bird, but do have a signal

Then the mod has not been performed correctly.  The mod provides a switched
ground to the channel element enable pin when the PTT is keyed.

Kevin


Message sent using Telaen Webmail 1.1.2