[RCSE] test

2006-03-08 Thread AJ Bhatta
 
 
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[RCSE] wanted

2006-03-08 Thread Dolores Iurato

Wanted ;  Pro Line  receivers on ham band, preferably on 53.1.  Please
reply offline.   Bill




t


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Re: [RCSE] Re: TX RF output?]

2006-03-08 Thread Martin Usher
What a novel and smart suggestion. Makes one wonder how many TX's out 

there have never experienced a tune-up...

They don't have any moving parts. Older radios may have parts like
descrete coils (sometimes with slugs) that can can change their size
slightly over time (mechanical, maybe due to just moving the radio
around) so its possible that the output spectrum could get misshapen
(i.e. splash over to adjacent channels). Its even possible for
crystals to age or get damaged.  But in general what you buy should be
what you'll use until the mechanical parts wear out.

That's not to say that it wouldn't help to look at the output spectrum
from time to time, but (IMO) suggesting to people that radios somehow
require regular servicing like a car is an application of FUD.

Martin Usher (time for the flameproof suit)

PS. Receivers don't emit R/F -- actually they could but they shouldn't
-- but if the transmitter is prone to drifting around then the receiver
would be as well, they've got the same kinds of internals as the Tx.


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[RCSE] Transmitter Stability

2006-03-08 Thread Bill Swingle
Martin raises a good point. I have to confess that I've recommended folks 
have their transmitters checked out every few years. But, that's based on 
general knowledge that I can't backup for this specific application.


I don't have any hard data on the behavior of solid state equipment over 
time.


Does anyone?

Bill Swingle
Janesville, CA


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RE: [RCSE] Re: TX RF output?]

2006-03-08 Thread John Diniz
No flame, just fact. Radios/RF decks (modules) still have tuning coils and the 
like. Just open up your radio or module and look at all the little parts with 
wax on them, that's what gets adjusted. We, Horizon Hobby and JR service center 
tune about 30-40 radios a day.

John

-Original Message-
From: Martin Usher [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 08, 2006 4:01 PM
To: soaring@airage.com
Subject: Re: [RCSE] Re: TX RF output?]


What a novel and smart suggestion. Makes one wonder how many TX's out 
there have never experienced a tune-up...

They don't have any moving parts. Older radios may have parts like
descrete coils (sometimes with slugs) that can can change their size
slightly over time (mechanical, maybe due to just moving the radio
around) so its possible that the output spectrum could get misshapen
(i.e. splash over to adjacent channels). Its even possible for
crystals to age or get damaged.  But in general what you buy should be
what you'll use until the mechanical parts wear out.

That's not to say that it wouldn't help to look at the output spectrum
from time to time, but (IMO) suggesting to people that radios somehow
require regular servicing like a car is an application of FUD.

Martin Usher (...time for the flameproof suit)

PS. Receivers don't emit R/F -- actually they could but they shouldn't
-- but if the transmitter is prone to drifting around then the receiver
would be as well, they've got the same kinds of internals as the Tx.


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[RCSE] Stylus FS

2006-03-08 Thread inventorforhire



Have a spare Stylus with Glider Card and Memory 
Card (can clear out setups or leave on)

Radio only $325(with choice of 16, 27 or 44 
(new)module and brand new just received today battery)
GC $95 MC $75 + shipping

all for $450 OBO delivered CONUS 

Tom

32 Mount View DrAfton, VA 
22920

540 943-3356


[RCSE] hoops harness

2006-03-08 Thread John D. Frugé
Guys, I need a source for a Hoops harness 3 piece wing (for a Zenith) 

Thanks,

John Fruge
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Re: [RCSE] Transmitter Stability

2006-03-08 Thread Michael Lachowski



Bill Swingle wrote:
Martin raises a good point. I have to confess that I've recommended 
folks have their transmitters checked out every few years. But, that's 
based on general knowledge that I can't backup for this specific 
application.


I don't have any hard data on the behavior of solid state equipment over 
time.





Wow, solid state, haven't heard that in a while.

The TX does take a lot of abuse.  Getting dropped, knocked around. 
Antennas get pushed and pulled all the time. (As anyone with a Vision 
may have experienced).  The electronics are not in a sealed environment. 
 There is dust, dirt, humidity, lots of things that can eventually find 
there way to the right place.   Running TX with the antenna down might 
produce some extra heat on the RF output electronics.


All the materials in the transmitter can age which affects thier 
performance. Plus mechanical problems like switches and pots wearing out.



Of course, given the types of comments on this topic, there are lots of 
folks out there who just keep running things until they break.


SOme people check thier batteries all the time, others never check them. 
  It's no fun loosing an airplane to equipment failure. You just have 
to decide how much time you want to spend preventing equipment failures.


Anyway, it's almost spring.  Time to start checking out your models that 
may have been sitting around for a while.

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[RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Arne Ansper



Hi!

Must get new battery for TX. Current one is down to 500mAh (from 750mAh) 
and lasts only for 2.5 hours. I can get 1100 mAh NiCd or 1650 mAh NiMH 
(both Sanyo) at the same price. Which one is better for TX?


Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Bill Swingle
Each will work fine for the TX. 

How will you charge it? 
Do you tend to abbuse your batteries?


Bill Swingle
Janesville, CA


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[RCSE] Power Supply repair

2006-03-08 Thread George Voss
Title: Power Supply repair






Can someone recommend a repair place for a 15A power supply? My charger leads shorted out the PS. The charger lived but I let out the magic smoke from the PS. If I can get if fixed for a reasonable amount Id like to do that instead of having to buy a new one.

gv 




Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Arne Ansper



On Wed, 8 Mar 2006, Bill Swingle wrote:

Each will work fine for the TX. 
How will you charge it?


I have Reflex charger that does peak prediction (same chip that is inside 
Sirius chargers), but it will only output 650mA max. I've heard that NiMH 
cells do not like too low charging current and 650mA is almost 1/3C.



Do you tend to abbuse your batteries?


No.

regards,
Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Doug McLaren
On Thu, Mar 09, 2006 at 01:45:08AM +0200, Arne Ansper wrote:

| Must get new battery for TX. Current one is down to 500mAh (from 750mAh) 
| and lasts only for 2.5 hours. I can get 1100 mAh NiCd or 1650 mAh NiMH 
| (both Sanyo) at the same price. Which one is better for TX?

The TX doesn't really care -- both will work.

The current draw is low, so NiMH cells will work just as well as NiCd
cells, and with the added capacity, will last longer.  Some simple
math suggests about eight hours for the 1650 mAh cells -- basically
all day.

Your slow wall-wart charger will work just fine, but with a pack
that's 3x as large, a full charge will take 3x as long.  A fast
charger will work as well, as long as it can do NiMH properly (and
nowadays, most can.)

NiCd cells do last longer (i.e. more years, more cycles) in general,
and will tolerate abuse better (i.e. fast charging, or leaving it on
the slow charger for weeks at a time) but the difference isn't that
large.  NiCd cells also handle high current draw abuse and vibrational
abuse (more of an issue in glow plane RX packs) but for a TX, neither
one is a problem.

You can also charge NiCd cells faster (2C or so vs 1C) but I'd rather
just not have to charge at the field at all if I can avoid it, so ...

NiMH cells do have a larger (2-3 times as large) self-discharge rate,
so after a week or two they'll be more discharged than a NiCd pack,
but if you charge the night before flying, you won't have any problem.

And so I make NiMH packs for my TX's nowadays in most cases,
especially for my computer TX's that draw a lot more current than the
old non-computer ones.

-- 
Doug McLaren, [EMAIL PROTECTED]
`The only time you have too much fuel is when you're on fire.'
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread George Joy

Arne,
 The NiCd will have a longer life span, and the NiMH needs a GOOD 
quality charger designed with NiMH features.

George
The Sirius Charger guy

At 01:45 AM 3/9/2006 +0200, Arne Ansper wrote:



Hi!

Must get new battery for TX. Current one is down to 500mAh (from 750mAh) 
and lasts only for 2.5 hours. I can get 1100 mAh NiCd or 1650 mAh NiMH 
(both Sanyo) at the same price. Which one is better for TX?


Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Doug McLaren
On Thu, Mar 09, 2006 at 02:07:34AM +0200, Arne Ansper wrote:

| On Wed, 8 Mar 2006, Bill Swingle wrote:
| 
| Each will work fine for the TX. 
| How will you charge it?
| 
| I have Reflex charger that does peak prediction (same chip that is inside 
| Sirius chargers), but it will only output 650mA max. I've heard that NiMH 
| cells do not like too low charging current and 650mA is almost 1/3C.

The danger with a low charge rate is that peaks are harder to detect,
so you run the risk of overcharging your battery if your charger
doesn't have a safety timer or a temperature probe.

My Triton has no problems detecting peaks even at a C/4 charge rate
with NiMH cells, and so I suspect that your Reflex won't either.

| Do you tend to abbuse your batteries?
| 
| No.

-- 
Doug McLaren, [EMAIL PROTECTED]
The only time you have too much fuel is when you're on fire.
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Bill Swingle

What Doug said. :-)

Bill Swingle
Janesville, CA


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Re: [RCSE] Re: TX RF output?]

2006-03-08 Thread Simon Van Leeuwen
You might consider asking a repair depot about how many TX's come in 
that are indeed emanating into adjacent channels.


Secondly, RX's have interfered with each other in dual installations 
causing a loss of range, which on some installations has been severe. 
Using isolation techniques, the problem has been solved consistantly...



Martin Usher wrote:
What a novel and smart suggestion. Makes one wonder how many TX's out 


there have never experienced a tune-up...

They don't have any moving parts. Older radios may have parts like
descrete coils (sometimes with slugs) that can can change their size
slightly over time (mechanical, maybe due to just moving the radio
around) so its possible that the output spectrum could get misshapen
(i.e. splash over to adjacent channels). Its even possible for
crystals to age or get damaged.  But in general what you buy should be
what you'll use until the mechanical parts wear out.

That's not to say that it wouldn't help to look at the output spectrum
from time to time, but (IMO) suggesting to people that radios somehow
require regular servicing like a car is an application of FUD.

Martin Usher (time for the flameproof suit)

PS. Receivers don't emit R/F -- actually they could but they shouldn't
-- but if the transmitter is prone to drifting around then the receiver
would be as well, they've got the same kinds of internals as the Tx.


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--
Simon Van Leeuwen
RADIUS SYSTEMS
PnP SYSTEMS - The E-Harness of Choice
Cogito Ergo Zooom

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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel

Arne,
I would suggest replacing your OEM NiCd pack with a higher capacity  
NiMh pack.  I did it a few years ago and have been delighted.  I can  
just about do a complete 2-day contest with my JR 9303 on a single  
charge.  I am using the 1650mAh Sanyo pack built by Steve Anthony at  
hangtimes.com.  The NoBS packs from Hangtimes cost a little more,  
but you are getting a top-quality pack.  Remember, it's not only  
about the cells.  Pack construction is just as important.  Everything  
depends on your TX.  A few extra bucks for the very best is money  
well spent, in my book.


http://hangtimes.com/txpacks.html

I also have a TX pack from Batteries America based on the Sanyo HR3U  
Twicell 2300mAh cells.  This works fine as well, but it is apparent  
when you look at both packs that the Hangtimes pack was built to a  
much higher standard.


Cheers - Jim Laurel

On Mar 8, 2006, at 3:45 PM, Arne Ansper wrote:

Hi!

Must get new battery for TX. Current one is down to 500mAh (from  
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or  
1650 mAh NiMH (both Sanyo) at the same price. Which one is better  
for TX?


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[RCSE] Gliders for sale, take a look...

2006-03-08 Thread Flying High
I'm selling the following items:

a.) Sharon 3.7 Pro X-tail, Yellow  Blue, ready to fly
minus Rx, excellent condition(almost new condition) this
was my back up Sharon. $1450.00

b.) Addiction, 118 span, 7037 foil, $580 minus Rx. 
c.) New in box Sharon 3.7 Pro X-tail, $1250.00
d.) 3M Gnome kit NIB $230
e.) Compulsion, 126 span, 7037 foil, minus Rx $850.00

Let me know if anyone need pictures to show the condition
on any of the above listed.  No JUNK here!

Thanks
Edgar
The Soaring Junkie



__
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
In a TX, NiMH offers superior performance given the relatively low 
current consumption. On the other hand, NiMH is inferior on the RX side 
when current demands are high when compared to NiCD.


Arne Ansper wrote:




Hi!

Must get new battery for TX. Current one is down to 500mAh (from 750mAh) 
and lasts only for 2.5 hours. I can get 1100 mAh NiCd or 1650 mAh NiMH 
(both Sanyo) at the same price. Which one is better for TX?


Arne
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--
Simon Van Leeuwen
RADIUS SYSTEMS
PnP SYSTEMS - The E-Harness of Choice
Cogito Ergo Zooom

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Re: [RCSE] Re: TX RF output?]

2006-03-08 Thread Jeff Steifel
Actually without being as smart as some of you I can still disagree with 
this.
 Most radios do get out of alignment. I have been on the receiving end 
of splatter. A tuneup couldn't hurt.
Receivers do emit RF. An ESL member has come up with a way of tracking a 
receiver based on its emission. He started with duplicating the Walston 
receiver using a Yasu and other  Scanners. Then by playing around he 
noticed he didn't need a walston transmitter in the plane, that with 
many RX's he could actually see their output on scanners.  While true 
not all receivers emit, most emit enough that he was able to pick them up.
I received a couple of bumps at the nats, but I remember 2 guys being 
out of shift enough that they caused I think it was Daryl to go in.. 
about 6-7 years ago. When the scanners looked at their frequencies they 
were obviously off of their channel... enough to be a problem.


Gotta run... my 2 cents.. probably all it is worth...



Martin Usher wrote:

What a novel and smart suggestion. Makes one wonder how many TX's out 


there have never experienced a tune-up...

They don't have any moving parts. Older radios may have parts like
descrete coils (sometimes with slugs) that can can change their size
slightly over time (mechanical, maybe due to just moving the radio
around) so its possible that the output spectrum could get misshapen
(i.e. splash over to adjacent channels). Its even possible for
crystals to age or get damaged.  But in general what you buy should be
what you'll use until the mechanical parts wear out.

That's not to say that it wouldn't help to look at the output spectrum
from time to time, but (IMO) suggesting to people that radios somehow
require regular servicing like a car is an application of FUD.

Martin Usher (time for the flameproof suit)

PS. Receivers don't emit R/F -- actually they could but they shouldn't
-- but if the transmitter is prone to drifting around then the receiver
would be as well, they've got the same kinds of internals as the Tx.


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--
Jeff Steifel

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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel
True enough, Simon.  But if you use large enough NiMh cells, there is  
more than enough ability to deliver the kinds of currents we need.  I  
have always thought it was silly to see people using 4-cell AA or  
even AAA NiMh packs in big TD ships, then adding lead to balance.  I  
always try to get as close as possible to the CG I want using  
batteries rather than lead.  In the Pike Superior, for example, I use  
4-cell packs of GP2200.  WIth a JR R770 up front and maybe ~3/4 to 1  
oz of lead taped to the side of the pack, you are usually right on  
the CG.  There is no current draw issue with those GP2200 cells!  ;-)


--Jim

On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:

In a TX, NiMH offers superior performance given the relatively low  
current consumption. On the other hand, NiMH is inferior on the RX  
side when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh (from  
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or  
1650 mAh NiMH (both Sanyo) at the same price. Which one is better  
for TX?

Arne
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--
Simon Van Leeuwen
RADIUS SYSTEMS
PnP SYSTEMS - The E-Harness of Choice
Cogito Ergo Zooom

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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread davidhauch

There is no current draw issue with those GP2200 cells!  ;-)


how do those Nimh's hold up in cold temps. compared to Nicads ?
from my experience the Nicads are better in cold.

dh





--Jim

On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:

In a TX, NiMH offers superior performance given the relatively low 
current consumption. On the other hand, NiMH is inferior on the RX  side 
when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh (from 
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or  1650 
mAh NiMH (both Sanyo) at the same price. Which one is better  for TX?

Arne
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--
Simon Van Leeuwen
RADIUS SYSTEMS
PnP SYSTEMS - The E-Harness of Choice
Cogito Ergo Zooom

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Re: [RCSE] Transmitter Stability

2006-03-08 Thread Simon Van Leeuwen
Ohhh ya, we conduct failure analysis on a regular basis at the full time 
grind.


Our radio systems employ commercial grade componentry, the dialectric 
changes over time within caps, checking on-frequency operation is wise. 
Keep in mind it's not for your benefit, but the pilot operating his 
system right next to you...


Bill Swingle wrote:

Martin raises a good point. I have to confess that I've recommended 
folks have their transmitters checked out every few years. But, that's 
based on general knowledge that I can't backup for this specific 
application.


I don't have any hard data on the behavior of solid state equipment over 
time.


Does anyone?

Bill Swingle
Janesville, CA


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Re: [RCSE] Power Supply repair

2006-03-08 Thread Simon Van Leeuwen
Check you local phonebook, or your local university or college 
electrical/electronics dept.


George Voss wrote:

Can someone recommend a repair place for a 15A power supply?  My charger 
leads shorted out the PS.  The charger lived but I let out the magic 
smoke from the PS.  If I can get if fixed for a reasonable amount I’d 
like to do that instead of having to buy a new one.


gv



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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread jrmaclean
Arne,  Consider that the transmitter has very little pulse load 
requirements, that is, the current drain is relatively constant so cell 
resistance is a minor consideration.  Therefore, the NiMH battery with its 
superior capacity at moderate current is a better choice.  The only downside 
to NiMH is a higher self discharge rate.  So figuring 2% per day, you loose 
a little over half capacity in a month. That is still three hours of run 
time left for a typical TX with a good safety margin.  I was convinced a few 
years ago and it has been working out very well.  Either way,  you have run 
time for anything except a Level 5 slope attempt!


Dave Thacker at Radical RC provided batteries and connectors at reasonable 
prices.


Jim MacLean 



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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen

Hi Jim,

The most important specification to consider is the cell impedence. You 
might be surprised to discover that cell (larger) surface area in those 
bigger NiMH cells still does not make up for lower impedence within an 
even smaller NiCD cell.


Add a larger (similar) NiCD cell and the lower impendence it offers 
and you can actually measure the available voltage difference at the 
servo when it is really needed...


Jim Laurel wrote:

True enough, Simon.  But if you use large enough NiMh cells, there is  
more than enough ability to deliver the kinds of currents we need.  I  
have always thought it was silly to see people using 4-cell AA or  even 
AAA NiMh packs in big TD ships, then adding lead to balance.  I  always 
try to get as close as possible to the CG I want using  batteries rather 
than lead.  In the Pike Superior, for example, I use  4-cell packs of 
GP2200.  WIth a JR R770 up front and maybe ~3/4 to 1  oz of lead taped 
to the side of the pack, you are usually right on  the CG.  There is no 
current draw issue with those GP2200 cells!  ;-)


--Jim

On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:

In a TX, NiMH offers superior performance given the relatively low  
current consumption. On the other hand, NiMH is inferior on the RX  
side when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh (from  
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or  
1650 mAh NiMH (both Sanyo) at the same price. Which one is better  
for TX?

Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen

They (NiCD's) are across the whole operating range...

[EMAIL PROTECTED] wrote:


There is no current draw issue with those GP2200 cells!  ;-)



how do those Nimh's hold up in cold temps. compared to Nicads ?
from my experience the Nicads are better in cold.

dh





--Jim

On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:

In a TX, NiMH offers superior performance given the relatively low 
current consumption. On the other hand, NiMH is inferior on the RX  
side when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh (from 
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or  
1650 mAh NiMH (both Sanyo) at the same price. Which one is better  
for TX?

Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel
Yes, for sure NiMh cells generally have lower impedance.  But we are  
talking about the GP2200 here.  I routinely draw around 70-95 amps  
from these things in my 10 and 12-cell electrics.  A TD plane, fitted  
with DS368s will draw a max of what, 5-6 amps?


--Jim


On Mar 8, 2006, at 6:13 PM, Simon Van Leeuwen wrote:


Hi Jim,

The most important specification to consider is the cell impedence.  
You might be surprised to discover that cell (larger) surface area  
in those bigger NiMH cells still does not make up for lower  
impedence within an even smaller NiCD cell.


Add a larger (similar) NiCD cell and the lower impendence it  
offers and you can actually measure the available voltage  
difference at the servo when it is really needed...


Jim Laurel wrote:

True enough, Simon.  But if you use large enough NiMh cells, there  
is  more than enough ability to deliver the kinds of currents we  
need.  I  have always thought it was silly to see people using 4- 
cell AA or  even AAA NiMh packs in big TD ships, then adding lead  
to balance.  I  always try to get as close as possible to the CG I  
want using  batteries rather than lead.  In the Pike Superior, for  
example, I use  4-cell packs of GP2200.  WIth a JR R770 up front  
and maybe ~3/4 to 1  oz of lead taped to the side of the pack, you  
are usually right on  the CG.  There is no current draw issue with  
those GP2200 cells!  ;-)

--Jim
On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:
In a TX, NiMH offers superior performance given the relatively  
low  current consumption. On the other hand, NiMH is inferior on  
the RX  side when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh  
(from  750mAh) and lasts only for 2.5 hours. I can get 1100 mAh  
NiCd or  1650 mAh NiMH (both Sanyo) at the same price. Which one  
is better  for TX?

Arne
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Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
You bet Jim, great cells. In competition, the packs are first heated to 
~50C to realize their full potential. It is at these temperatures and 
higher that they offer excellent voltage retention!


Jim Laurel wrote:

Yes, for sure NiMh cells generally have lower impedance.  But we are  
talking about the GP2200 here.  I routinely draw around 70-95 amps  from 
these things in my 10 and 12-cell electrics.  A TD plane, fitted  with 
DS368s will draw a max of what, 5-6 amps?


--Jim


On Mar 8, 2006, at 6:13 PM, Simon Van Leeuwen wrote:


Hi Jim,

The most important specification to consider is the cell impedence.  
You might be surprised to discover that cell (larger) surface area  in 
those bigger NiMH cells still does not make up for lower  impedence 
within an even smaller NiCD cell.


Add a larger (similar) NiCD cell and the lower impendence it  offers 
and you can actually measure the available voltage  difference at the 
servo when it is really needed...


Jim Laurel wrote:

True enough, Simon.  But if you use large enough NiMh cells, there  
is  more than enough ability to deliver the kinds of currents we  
need.  I  have always thought it was silly to see people using 4- 
cell AA or  even AAA NiMh packs in big TD ships, then adding lead  to 
balance.  I  always try to get as close as possible to the CG I  want 
using  batteries rather than lead.  In the Pike Superior, for  
example, I use  4-cell packs of GP2200.  WIth a JR R770 up front  and 
maybe ~3/4 to 1  oz of lead taped to the side of the pack, you  are 
usually right on  the CG.  There is no current draw issue with  those 
GP2200 cells!  ;-)

--Jim
On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:

In a TX, NiMH offers superior performance given the relatively  low  
current consumption. On the other hand, NiMH is inferior on  the RX  
side when current demands are high when compared to NiCD.


Arne Ansper wrote:


Hi!
Must get new battery for TX. Current one is down to 500mAh  (from  
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh  NiCd or  
1650 mAh NiMH (both Sanyo) at the same price. Which one  is better  
for TX?

Arne
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[RCSE] test

2006-03-08 Thread Paul Ferradas
test

  www.ferradasphotography.com
  www.modelmayhem.com # 24657
  www.onemodelplace.com #116327





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[RCSE] FS: Sharon 3.7m TD $875.00

2006-03-08 Thread Paul Ferradas
I have a Yellow/Blue V-Tail Sharon 3.7m TD sailplane
for sale. It has Volz servos throughout, RADS system
installed on the ailerons. Hitec Super Slim 8
receiever, just pop in your crystal, program and go
fly! It's that simple. This Sharon was purchased from
Edgar Soaring Junkie a couple of years ago, I had a
line catch on my first flight with it and I cracked
the fuse and crinkled the very tip of the wings
crinkled a bit, it was fully repaired and flown all
season, I took 2nd in Sportsman at DVSS, 3rd Open at
Gamblers Gala, top 20 at Vislalia 2004, it's a great
flying ship and it's proven itself time after time.

Pictures can be seen here:

http://www.ferradasphotography.com/Sharon

Asking $875.00 FIRM

I can have this plane delivered to Davis or Fresno
Classic if your seriously interested in buying it.

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[RCSE] Re: TX RF output? and urban legends

2006-03-08 Thread GordySoar



the receiving end of splatter.


This is mostly just that .splatter, not RF but 
conversation.

OurRX's have ahuge problem...they are sooo selective 
they barely listen to their own frequencies, so the idea of them being bothered 
by some sort of close emission from a grey tuned TX, while 'possible' fact is 
the offending TX's emission would have to be aspowerful as your own TX's 
correct output so as to 'slur' your TX's frequency.. The reason 
for tuning your TX is so that YOUR RX can hear it, 
not to avoid someone else's RX from hearing it.

However stories about getting shot down arereinforced by 
reports of off tune TX's makesthem more dramatic which equals 
'real'. When in fact seldom is a 'shoot down' a shoot down, usually the 
cause is a faulty on board power connection...switch, or connector.

Cases like the Nats problems are more likely due to on board 
antenna situations., or then there is the assumption that the pilots TX must be 
working just fine at the time of the glitches.Dirty antenna,a 
funkyrubber ducky install or it's sloppy BNC connector 
connectionor some other mechanical shortcomingcouldn't be 
:-)

It is a lot easier and more fun to put the blame on the other 
and his probablyout of tune module, the mysterious 'them' are 
always the culprit..

The above is of course only a guess based on ..oh about a 
million hours of flying on sites all over the world, conversations with guys 
like Steiner and Marks on the subject, so take it all with a grain of, any way 
you want :-)
Gordy
Los Angles tonite