At 3/21/2008 15:01, you wrote:
>Here is a cascade noise figure calculator. Play around with different gain
>figures and noise figures for the first amp to see how it affects the
>total noise figure. Consider the second amp your receiver. Put in an 8 db
>or so figure for the second amp to simula
Hi All,
I am having problems with a Tait T855 receiver module does anyone have a
schematic diagram for this unit please.
Trev
[EMAIL PROTECTED]
M0OML
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the Repeater-Builder
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File: /Cascade noise figure.xls
Uploaded by : no6b <[EMAIL PROTECTED]>
Description : An Excel spreadsheet that calculates total system noise
For Sale: NHRC-5 Repeater Controller with Real Speech and Linking
Port. Purchased 01/16/2008. Also have reinforced aluminum box with all
cable cutouts done with milling machine. All original paperwork and
manual in a new notebook. With all accessories. Never installed nor
used. Paid $265.00, will
I have tuned many of these in the past, and the last set I tuned was
doing exactly what you say. But they looked great on the HP 8920, but
as soon as any power was run through them, the tuning went all to
hell and there was major desense.
So I looked a little closer by taking the 80 odd screws
I used the one that normally tunes the driver to the final.
Yup I sorta have a grave yard of known dead PPL-6060s, some were bad
recievers, others didn't transmit. I guess I should mark them.
On 3/21/08, Paul Finch <[EMAIL PROTECTED]> wrote:
> Which of the tuning capacitors did you have to use fr
I just looked at the MRF-644 data sheet and it makes no mention of
Beryllium Oxide with the usual health warnings.
At the moment I think the burning sensation in my chest is heart burn
at from the onions on my Double Double I had for lunch.
On 3/21/08, skipp025 <[EMAIL PROTECTED]> wrote:
>
> One
I have 3 275 watt vhf stations that used to be for paging. They are
currently on 152.700 I believe but have 70mhz receivers in them. 2
should be in good condition but 1 needs the screen voltage pot
replaced. These are in aproximately 7' tall cabinets and weigh several
hundred pounds so shippin
Which of the tuning capacitors did you have to use from the PPL? I hope it
was not that really little one, they cause more problems than anything.
Wow, you had to try three PPL's before you found a good PA transistor? That
is unusual, in the shop I worked at we seldom changed one, had more proble
One of the main issues with Beryllium Oxide is to not breath
any of the dust when it breaks, is ground on or sanded. I work
with it every so often and actually can and do repair broken
Beryllium oxide parts for industry, which include some of the
blocks found in rf amplifiers.
cheers,
skipp
looking for ht1000 trunked need 2 as demo radios
need not work.
Db 4044 bhf duplexer. thas rite bhf. 150-174
mc... looking for 3-4 in excellent condition.
and of course chp!!!;-)...but, let us know if
you got any.
m1225 20 chan vhf mobiles
or gm300 16 chan scan
tnx
happy holiday to all ce
Here is a cascade noise figure calculator. Play around with different gain
figures and noise figures for the first amp to see how it affects the total
noise figure. Consider the second amp your receiver. Put in an 8 db or so
figure for the second amp to simulate your receiver.
You will see that
At 02:07 PM 3/21/2008, Stu Benner wrote:
>I am ignorant about the particular parts you are discussing.
>However, caution should be used when dealing with ceramics such as
>this. They may be Beryllium oxide which has excellent thermal
>conductivity and electrical insulation properties, however,
I did the grinding with the dremmel head and transistor in a large plastic
ziplock as a make shift glove box. Some water was in the bottom of the bag
to act as a dust capture. Hard to run the pliars though.
On 3/21/08, Stu Benner <[EMAIL PROTECTED]> wrote:
>
> I am ignorant about the particular p
I am ignorant about the particular parts you are discussing. However,
caution should be used when dealing with ceramics such as this. They may be
Beryllium oxide which has excellent thermal conductivity and electrical
insulation properties, however, it is a carcinogen. A web search will reveal
lots
I had to grind the flange and ceramic of the 4062 with my dremmel to
make it fit the PCB in the FT-857D. Took me 3 PPL-6060s from my scrap
pile of Johnsons before I found another one with a working final
transistor. The first transistor I salvaged didn't have the ceramic
ground down enough so when
> Jeff D wrote: However (somebody correct me if I'm wrong), I vaguely
> remember the EIA standard for performing SINAD measurements to be 2/3 of the
> system deviation, i.e. 3.33 kHz.
I remember when I bought my Helper Instruments "Sinadder" many years
ago, it recommended 3.3 kHz deviation at e
John,
It depends on the pattern you want.
Me having a repeater about 1/2 mi from the Gulf of Mexico don't want a omni
pattern.
>From Decibel cat for omni on 18" face tower 3/4 wl appears to be most omni.
>1/2 wl give pattern most in 3 directions (N, SE & SW) and slight nulls in 3
>other dir
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