Hi all,
I'm looking to try my hand at layout for some microwave printed circuit boards.
Would any of you know where I might find (on the internet) formulae for the
design of various PCB pattern geometry for various microwave functions (ratrace
mixers, wilkinson splitters, hairpin filters,
Nate,
Thank you for your incredibly comprehensive response RE: PIC and AVER
programming and the state of that art.
I also started with assembly language on 8085s and Z80s in the late 70s but
gradually moved toward C and eventually LabVIEW on higher level machines. I
loved the completeness of
OK, so I need to boost the power of my repeater from the 25-30 watt
level and went to the Telewave website and found the power rating of
the duplexer at 350 W. I can generate up to 350 watts with my FET
amplifier and it is clean. I can also adjust the power easily to 100
watts. My thinking is
Personally, I'd go up to 300 watts which would give
you a 10dB improvement. That much WILL be noticeable.
Also you won't be pushing everything to the maximum
it's capable of. Gives you a bit of a safety margin.
But then again, the FCC rules state something about
[...the minimum power necessary
I've got a Wacom 6943-SP (yeah, I know) Broadband
Duplexer. It has four 4x4x12 inch bandpass sections on
each side. All interconnections are done internally
(i.e. no external coax jumpers between sections).
According to the label, it was originally tuned for
901-902MHz RX, 929-932MHz TX. When
Hi Jeff,
I've got some ideas to reply back with... but I wanted to also
run your post by the members of the Yahoo rfamplifiers group.
http://groups.yahoo.com/group/rfamplifiers/
Hopefully we'll get you a few different answers to review.
cheers,
skipp
skipp025 at yahoo.com
--- In
Don't risk loosing your coordination by running more than you are
coordinated for. Just something to keep in mind.
Chuck
WB2EDV
- Original Message -
From: Bob M. [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 14, 2008 11:53 AM
Subject: Re:
The trace width has to become a 50 ohm strip line. The botom layer of
the PCB should be a solid ground plane. There is some debate about
ground plane clearence to the top trace, I generally go with the width
of the strip line on either side. Be sure to add plenty of vias to
connect the top and
It should handle the 350 watts no problem. Just feel the top of
the cavity at high power for excessive heat. And measure the loss
in actual operation...
You'll notice more broad-band stuff (more transmitter sideband
noise from the PA Output) at the front end of your receiver... so
you'll
Hey all,
MSR2000 does the exciter do any pre-emphasis, or is the repeater
designed to use flat audio stock from Motorola? I know the local
speaker de-emphases audio, but repeat audio, does it get de-emphasised
then pre-emphasised at the exciter?
Thanks,
Jesse
Wanted to buy: Motorola TLN6824/KLN6210 encoders, 136.5 Hz.
TLN8381 DECODERS 136.5
Any quantity accepted.
Lance Alfieri N2HBA
[EMAIL PROTECTED]
I am looking for a PDF version of the original Cat200 controller. I know
the B version is on the cat site. Anyone have this available in PDF
format?
Corey N3FE
Mel,
Depends mostly on what duplexer you have. Many base type duplexer's will
handle 350 W, but at that level of TX power the duplexer might not do enough
for the receiver and cause desense.
When running only 4 cavities this often happens even with 100 W better
commercial rigs. Running
de W5DK wrote:
Nate,
Thanks for the info, I have 4 or 5 clean 4076s that won’t go below
444/449 and still look good separation wise. I had made a call about 6
months ago and was told the cables were all the same but the loops are
slightly longer on ones spec’d in the ham band. (wonder
How much do you want for it?
Jesse
On Sat, Apr 12, 2008 at 2:15 PM, Mike Mullarkey [EMAIL PROTECTED] wrote:
I am going to sell my bench service monitor. It is in excellent shape and
has the factory bag with it. I am going to place it on Ebay if anyone here
on the list is not
I have 2 UHF duplexers, one Decibel labeled by GE, and a Motorola.
Both are using RG142 coaxial cable which is double shielded tinned or
silver braid.
I also have a pair of VHF Decibel cans that are using a jumper of RG214U
between the two cans. I presume the 214 is silver or tinned
From what I have read in the manual, the receiver board puts out
discriminator audio, and the exciter modulates direct FM with no
pre-emphasis.
So with a MSR200 repeater in its simplest form Receiver, Station
Control Card, Squelch Gate, Exciter, I would suspect that the audio
remains unchanged
Hi Jesse,
The MSR2000 processes the audio, and does de-emphasis, on the R1-Audio
board before it goes through the various paths to the exciter where it gets
pre-emphasized.
73, Tony VE3DWI
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent:
I know R1 card does have a de-emphasis circuit, but I thought that was
for the local speaker only, and that repeat audio doesn't go through
that card.
Any idea which components in the exciter pre-emphasize the audio?
Jesse
On Mon, Apr 14, 2008 at 3:47 PM, Tony Lelieveld [EMAIL PROTECTED]
Ian,
The Motorola MHW710-3 is not common here in the US, because the -3 indicates
470-512 MHz operation. The -1 version is for 400-440 MHz, and the -2
version is for 440-470 MHz. My limited experience with this 13-watt PA
module is that operation outside of its specified band split is not a
Thanks Eric .Its used in a Philips tx815 w band which we use for commercial
land/mobile use here . .I am currently trying to locate a tx815u band to
suit my latest frequencies 454 and 463 mhz .I have tried one of the
suggested stockist but are still looking to locate suppliers.
Thank You,
Ian
Jesse,
Again here is the text from my first reply. The MSR2000 processes the
audio, and does de-emphasis, on the R1-Audio board before it goes through
the various paths to the exciter where it gets pre-emphasized. If you have
the manual, look at the RF control chassis where all the
Jesse,
In the exciter description paragraph 2.1 TRANSMIT AUDIO CIRCUIT it states,
Exciter audio from the station control module (or test microphone) is
applied to audio amplifier Q501, then routed to the clipper/pre-emphasis
circuit of Q502 and Q503. etc. etc. It's all there for you to read. I
I have bits and pieces of a manual, unfortunately that part I didn't have,
thanks Tony
Jesse
On Mon, Apr 14, 2008 at 7:17 PM, Tony Lelieveld [EMAIL PROTECTED] wrote:
Jesse,
In the exciter description paragraph 2.1 TRANSMIT AUDIO CIRCUIT it states,
Exciter audio from the station control
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