I would suggest you try a 100uH inductor and as well as a 1000uF
capacitor as an L/C filter. You may need 2 sets in series depending on
how bad the noise is.
On 4/17/07, Doug Hutchison [EMAIL PROTECTED] wrote:
Have a system comprising 4m simplex link and 2m repeater running from
same PSU.
Jim,
Right now we have a very good relationship with the building owner and
the transmitter in there. Our space rent is very nominal and I want to
keep it that way. I thinking of trying to hang a rack on the wall that
will give us VHF and UHF in the same cabinet, if possible. Our system
is
I'm sorry. I should have been more clear on my first
post. This repeater was being built for GMRS NOT FRS.
The FRS radio I was using has a trim cap on the
crystal for the PLL allowing it to be tuned to the
GMRS frequencies. This radio is for receive only. The
PTT button has been removed. It has
- Original Message -
From: skipp025 [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 16, 2007 12:33 PM
Subject: [Repeater-Builder] Re: Poor Mans Repeater - Receiver
Voice ID would be legal. If the regs read the same for the
repeater... the legal ID is
Kroy makes a compact labeler that prints on heat-shrink tubing. I also
use Brother P-Touch labels under clear heat-shrink. Actually, almost
anything under clear heat-shrink works. I've had mixed results with the
'self-laminating' kinds. Unless you use a stable ink (NOT sharpie), they
tend to bleed
Hi,
any one help me with conversion details for the yaesu FT-4000H for cross
band repeater operating mode.
regards
deepan Vu2 dpn
_
Palate teasers: Straight from Master Chef Sanjeev Kapoor
Thanks Nate, I've put your email in the special folder on our repeater..
I remember when I was with the Phone Co., we did just what you are
suggesting.. Wrote it all down, twice or three times, that was before
digital photos of course..
73, Bob Smith WB6ODR, Prescott, AZ
- Original
Have a system comprising 4m simplex link and 2m repeater running from
same PSU.
Tried using a brushless fan to boost cooling but when running and
connected on the same PSU as the RF kit, the noise generated on 4m TX
audio (not 2m), a very loud buzz, is incredible. Obviously the inverter
noise
Our Micro is on 2 meters and has a 70 cm receiver in the cabinet who's
frequency I don't know. Need to find that out!!
^ control receiver maybe??? just a thought...
73
Mike Perryman
www.k5jmp.us
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED]
At 4/16/2007 10:00 PM, you wrote:
Good thinking Bob, I will look in to it. Do you have a schematic or
the model number of the squelch you were working with?
No schematic handy here. It was the stock squelch circuit in a mid-80's
vintage Hamtronics R144 or whatever repeater grade RX they were
No schematic handy here. It was the stock squelch circuit in a mid-80's
vintage Hamtronics R144 or whatever repeater grade RX they were selling
at the time. The noise filter was a simple 2-pole BPF with a very high
Q. The op amp they used was the dedicated op amp within the MC3357 or
Re: mc-3357 mc-3359 squelch circuit
Many receivers used the two mentioned chips... in both commericial,
Amateur Radio and classic scanner circuits. I've seen both part
numbers converted to tk numbers in Yaesu and Uniden Radios.
There are a number of working squelch circuits using the back
Many receivers used the two mentioned chips... in both commericial,
Amateur Radio and classic scanner circuits. I've seen both part
numbers converted to tk numbers in Yaesu and Uniden Radios.
I wanted to do a receiver based on the SA-604 and an external squelch
circuit, but it is still on the
On 4/17/07, DCFluX [EMAIL PROTECTED] wrote:
If cheap is the goal why not just convert a MASTR-II or a Micor? The
last 2 Micors I got were free and I paid $20 each for some Custom
MVPs. Pretty cheap. I'd prefere designing something from the ground up
vs. just converting something into the ham
Nothing wrong with a Master II, Micor or MVP Radio.
The test case radios I'm using for the poor mans repeater project
are Midland Syntech 70-340b units, which cost us $10 each. Last
night we put the previously built (by us) cor/cos interface relay
(yes we used a relay vs something solid
A few years ago I designed a dual level squelch circuit that could be a
replacement for the Micor type carrier squelch. I built a couple of the
prototypes and put them into service, and they worked very well, you
really couldn't tell them from the real thing.
They were designed around readily
Doug,
The solution is to replace the noisy fan with one that is designed for very
low EMI. The first thermostatic switch controlled fan I put on my
solar-powered UHF repeater had a whine that modulated the carrier. I then
swapped it with a Panasonic fan that was specified for low EMI. Presto!
I too had a fan noise on my GR 300 repeater. As Eric instructed, I replaced
the fan with a low EMI. Still had some but a lot less. Then I took the new low
EMI fan and removed it from the repeater cabinet and hung it from the big
cabinet, holding all the repeater items, so it still blows on the
Ah yes, The JEM squelch. If I look around I can probably find the GIF
you sent me that became the comparator section for the SuperSquelch
Mk.1.
It was pretty good, but there is always room for improvement. By
replacing the comparator section with a microcontroller the board can
be talored for
As Rod pointed out, the vibration from the fan causing transmitted
noise in his GR300 Rptr. In the Motorola GM,Radius M, and Maxtrac,
series mobiles the RX and TX VCO's are very sensitive to vibration.
Other radios may be sensitive to vibration also.
[EMAIL PROTECTED] wrote:
I too had a fan
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