[Repeater-Builder] Re Icom portable repeater?

[helifreekuk]

The firm required is Porta link. The firm is still around i believe

Hope it helps.

73 Dave in the U.K






 
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[Repeater-Builder] Re: Re Icom portable repeater?

[skipp025]

the web page is: 

http://www.rrsta.com/portalink/pl.html 

They seem to be out of production.  Maybe I should start 
making them.  A $69 retail price for less than $5 in parts 
is not bad. 

cheers
skipp 

www.radiowrench.com/sonic 

> "helifreekuk" <[EMAIL PROTECTED]> wrote:
> The firm required is Porta link. The firm is still around i believe
> 
> Hope it helps.
> 
> 73 Dave in the U.K






 
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[Repeater-Builder] ARU251 Repeater

[Mathew Quaife]

Can anyone tell me if the ARU251 repeaters use the Oven crystals, if 
so how can one be sure if they are oven xtals or if they are standard.

Thanks.

Mathew







 
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Re: [Repeater-Builder] ARU251 Repeater

[Dave VanHorn]

At 11:01 AM 7/13/2005, Mathew Quaife wrote:
>Can anyone tell me if the ARU251 repeaters use the Oven crystals, if
>so how can one be sure if they are oven xtals or if they are standard.

An ovenized crystal should be sitting in a little cylindrical "hat" 
that has a heater in it.
Usually a transistor/diode circuit with a resistor, that simply 
wastes power till it gets up to temperature, plus some insulation to 
keep it from trying to heat up the whole box.

How's the system doing?





 
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Re: [Repeater-Builder] ARU251 Repeater

[XE2SI]

The Uniden's I have worked with , had just a small square 
"sand"
resistor in a side of the TX crystal and with other few parts 
to
maintain some "constant temperature
Juan

  - Original Message - 
  From: 
  Mathew Quaife 

  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Wednesday, July 13, 2005 9:01 
  AM
  Subject: [Repeater-Builder] ARU251 
  Repeater
  Can anyone tell me if the ARU251 repeaters use the Oven 
  crystals, if so how can one be sure if they are oven xtals or if they are 
  standard.Thanks.Mathew Yahoo! 
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[Repeater-Builder] (unknown)

[sharp lawncare]

Please remove my e-mail address from list.__Do You Yahoo!?Tired of spam?  Yahoo! Mail has the best spam protection around http://mail.yahoo.com 








  
  





  
  
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Re: [Repeater-Builder] (unknown)

[Mike Morris WA6ILQ]

At 10:35 AM 7/13/05, you wrote:

>Please remove my e-mail address from list.

Please refer to the MESSAGE HEADERS for the link-to-unsubscribe -- we (the 
list members) cannot do this for you.  (well, I suppose someone could try 
to forge being you, but...)

Admittedly, by posting to the list there is the possibility that the list 
administrator will remove you, but it would be at his whim, not yours

Secondly, please be aware that when REMOVING yourself from this (and most 
any other) list, you WILL receive a confirmation message -- it is ENTIRELY 
possible that any "spamfilter" software you have may trap this (because it 
contains spam-like content, such as a "click here..." link with a uniquely 
identifiable tag) so PLEASE check any quarantine area you may have for a 
message that you have to reply to.





 
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[Repeater-Builder] WTB: vhf bandpass cavity

[Ray Retzlaff]

I am in need of a vhf (2 meter) bandpass cavity.  if anyone has one for sell 
or knows of where i could buy a good used one please email me at 
[EMAIL PROTECTED]

73
Ray





 
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[Repeater-Builder] WANTED: 146.640 tx element/crystal for Mitrek or MSR2000

[na6df]

Anybody have an element, or even just the crystal for a Mitrek or MSR-
2000 transmitter on 146.640 ??

I need one for a project, and thought just maybe someone might have it 
laying around..

Thanks!
dave NA6DF









 
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[Repeater-Builder] Re: VXR-7000

[Brett Dawson]

Hi Brian,

I am not sure if this has been said already as I haven't been back 
through the thread however it seems that you may have a couple of 
issues here.  

Firslty your new equipment has significantly more OP and better RX 
sensitivy.  This will certainly test the isolation afforded by the 
duplexer.

Secondly your new TX may be noisier off freq than your original TX 
and so require more isolation at the RX freq.  Given the increase in 
TX power this is almost certainly the case.

Thirdly 

It would be interesting to work out if the desense is being caused by

(i)fundamental overload of the RX
(ii) TX sideband noise falling in the RX passband
(iii) Other noise being generated by the TX operation, which falls 
in the RX passband

The first 2 can generally be solved by improving the duplexer 
through additional cans/tuning etc.  The third is trickier and 
really needs to be addressed at the source.  For example if you have 
a noisy antenna (say water ingress has caused corrosion) filtering 
in the duplexer will not fix this problem.  The same can be said for 
noise coming from other sources, eg connectors, metal on metal 
moving contacts in the TX field etc. 

A test you can do to isolate the problem is to terminate the OP of 
the duplexer in a 50ohm load.  If desense goes away the problem may 
be noise from the antenna or feeder system or that the 
antenna/feeder system is presenting a high VSWR that has the effect 
of reducing isolation in the duplexer.  If the desense persists the 
problem is probably in the duplexer, or lack of isolation between 
the TX and RX directly (ie leakage between them).

This is a rough test but if you patch around one of the TX cavities 
(ie remove it from cct) and the problem doesn't change then it could 
be the RX cavities aren't rejecting TX carrier well enough.  If you 
patch around one of the RX cavities and the problem doesn't change 
then it could be the TX cavities not rejecting the TX noise in the 
RX band well enough.  If in either case the desense does get worse 
these tests aren't really valid. This test should be done with a 
50hm termination on the antenna port. 

Be careful with all of the bits and pieces you test with.  I was 
testing a 2m repeater recently and could not get rid of a desense 
problem.  It turned out the 50ohm termination and some of the RF 
adaptors I had were noisey.  Once I removed these everything worked 
well.

With respect to your flaky TX power problem, that cavity you 
identified as the cause may also be generating noise which could be 
causing your desense issues.  If possible pull it apart and look for 
corrosion, loose parts etc.  Also check all the cabling and make 
sure there is no chance a connector is loose (ie not terminated 
properly) or a cable damaged.  Shake the cavity and look at the 
transmission loss and VSWR - see if anything changes.


Personally I would start by looking for something generating noise 
in the system rather than suspecting the cavity performance.  Look 
hard at that crook TX cavity.


Hope this helps.  I have found these problems tricky and the best 
way to solve them is to logically eliminate as much as you can.  The 
trial and error method can be very frustrating...

Regards

Brett (VK2CBD)

--- In Repeater-Builder@yahoogroups.com, Brian <[EMAIL PROTECTED]> wrote:
> Ok, today we went out on the hill and did much testing. We ended 
up 
> running the new repeater on 2 antennas as this seems to work and 
we 
> are going to see how it goes for a bit.
> 
> Several things were learned while testing things.
> 
> 1.  Our old machine was only putting out about 4 watts before the 
> duplexers. We thought 10 to 12 watts.
> 
> 
> when we hooked up the new machine into the line with duplexers and 
> all we noticed an odd thing.
> 
> 2.  The new machine took a couple of seconds to come to full power 
> through the duplexers.key up needle on meter moved to about 15 
> watts kind of slowly and sporadiclly then boom suddenly jumped to 
> full full power.   We ended up through much swapping things around 
> isolating this to one of the duplexer cans on the transmit side. 
> Without that one can it keyed up instantly.
> 
> 
> Has anybody seen this and I assume it means that the can is bad or 
faulty
> 
> This problem only showed up on the new repeater as the old one 
didn't 
> put out enough power to seem to cause this problem.  Anyway I 
really 
> appreciate this list everyone here has been great.
> 
> Brian
> -- 
> [EMAIL PROTECTED]
> Amateur Radio Callsign: KC0DWX
> WARN (Weather Amateur Radio Network) member








 
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[Repeater-Builder] Nutec series hr repeater

[pmci1]

Hello,
I have a Nutec series HR 220 repeater. I would like some info on it. 
If any one can help it would be greatly apprecated
Bill
WD2E








 
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Re: [Repeater-Builder] Amp ID

[Mark A. Holman]

did he read some other sticker ?

I just looked at some orange sticker on a RF amp for a cell phone about  3x3 
inches even though it was a Motorola RF amp for a cell phone in the analog 
band but I was putting stuff in a box XYL wanted me to clean the car out 
from my radio haul from storage , I will probably wait til sat to sell this 
stuff on ebay !

Mark A. Holman  AB8RU ARRL Life Member
[EMAIL PROTECTED]

- Original Message - 
From: "Don" <[EMAIL PROTECTED]>
To: 
Sent: Monday, July 11, 2005 2:43 PM
Subject: [Repeater-Builder] Amp ID


> Got this E-Mail from a Fellow Friend/ Ham/ Repeater owner and Motorola
> user I Did not want to tell Him I had no idea what it was. He thinks I
> know everything about the Old Motorola Stuff; so if anyone can ID
> This.   It will greatly appreciated and of course I would never take
> credit for it ,Ha Ha
>
> Thanks Don KA9QJG
>
>
> Don,
> Here are the numbers from the Motorola amp module.  There are several,
> so I do not know which one is the one you need.
>
> 01T78
> 7940FW
> HLE4070A
> 03T04
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
> 





 
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[Repeater-Builder] OT: NC man charged with 'driving a cop car' due to ham antennas

[mch]

This is slightly off topic, but I wanted everyone to be aware of what is
happening to a NC man who equipped his Chevy Caprice Classic with ham
antennas. He is now *charged* with driving a car that resembles a law
enforcement vehicle. Apparently that is a law in NC.

Details here:


This will be my only post on the subject.
Please direct any discussion there.

This could be you if you have many antennas on your car (as many of us
do) and drive through NC in anything close to the same model car LE uses
(Caprice, Crown Vic, Intrepid, Impalla, Etc, or even any of the clones
such as Park Ave or anything based on the same frame).

Joe M.





 
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