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ZL3AI > APRDIG 25.11.03 20:52l 270 Lines 10064 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Saturday, November 22, 2003.
1. Re: What low current draw radio for solar powered site?
2. Re: What low current draw radio for solar powered site?
3. Re: What low current draw radio for solar powered site?
4. Re: What low current draw radio for solar powered site?
5. Re: What low current draw radio for solar powered site?
6. Re: What low current draw radio for solar powered site?
7. Re: What low current draw radio for solar powered site?
8. Re: What low current draw radio for solar powered site?
9. Re: What low current draw radio for solar powered site?
10. Re; What low current draw radio for solar powered site?
11. What low current draw radio for solar powered site? k7fw
12. OT: Anybody use a FT-100D for aprs
13. DigiTravler current
14. Re: DigiTravler current
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Subject: Re: What low current draw radio for solar powered site?
From: "James Jefferson" <jj@aprsworld.net>
Date: Fri, 21 Nov 2003 23:55:22 -0600 (CST)
X-Message-Number: 1
>The Yaesu FT-1500M can be had for ~120. According the manual it's less
>than 0.7A w/ signal, 0.3 squelched. Running a digi with open squelch is
> popular with some people (in some cases it depends on the TNC too) so
>I'd lean more towards that 0.7 figure, especially during peak useage
>periods.
It's probably going to be closer to 0.3 amps. I measured mine to be 0.36
amps on standby. The higher value with open squelch is because it will be
driving the speaker - in packet mode you won't be driving some 8 ohm
speaker.
-Jim
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Subject: Re: What low current draw radio for solar powered site?
From: Bob Bruninga <bruninga@usna.edu>
Date: Sat, 22 Nov 2003 08:53:08 -0500 (EST)
X-Message-Number: 2
On Fri, 21 Nov 2003, Dale Mosby wrote:
>I recently bought an ICOM IC-2100H to run as an APRS unit
>..., but receive current drain is listed in the manual as 0.8
>amps!
Yes, use an HT which should draw less than 10% of that.
There are many 5W HT's available for about $100 I think. TX power is not
an issue at all. Its the receiver power that is the bulk of solare power
you will need.
Bob
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ: http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite http://ssdl.stanford.edu/mims/
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Subject: Re: What low current draw radio for solar powered site?
From: "Dick Stanich" <dick@kb7zva.com>
Date: Sat, 22 Nov 2003 7:59:12
X-Message-Number: 3
Is there room for some batteries? A used Mitrek with good channel elements
and a KPC-3 does the trick for us. I hear that there are a few Mitrek
radios still around, cheap. Re-working the channel elements cost more than
what you would expect to pay for the whole radio (50 to 75 watts $25 -
$50).
If this is a commercial site, I'd be surprised if they would allow any
non-commercial radio, without lotsa filters. Mountain top sites are very RF
noisey. CD SOFTWARE on the KPC's works great, running open squelch.
Batteries to radio works good. Many possibilities here... Batteries to
power an inverter and a switch for a power supply, if site has 120v. Still,
batteries (big) are better. My site:
http://personal.riverusers.com/~aprswest/pics/Black.html
Dick, KB7ZVA
APRSWest
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Subject: Re: What low current draw radio for solar powered site?
From: Mark Earle <wa2mct@mearle.com>
Date: Sat, 22 Nov 2003 07:59:00 -0600
X-Message-Number: 4
If the HT is an IC2AT or Radio Shack HTX 202, there is no T/R relay.
These are 1-2 watt transmitter power radios. Pretty good for this type of
service.
) ) de WA2MCT Mark
( (
) ) You will be assimilated... oooh, coffee!!
_|****| http://www.findu.com/cgi-bin/find.cgi?wa2mct-8 Home
( | | http://www.findu.com/cgi-bin/find.cgi?wa2mct-9 Mobile
`|____| wa2mct@mearle.com wa2mct@juno.com www.mearle.com/mark
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Subject: Re: What low current draw radio for solar powered site?
From: "Spider" <spider@rivcom.net>
Date: Sat, 22 Nov 2003 08:37:55 -0700
X-Message-Number: 5
From: "Bob Bruninga" <bruninga@usna.edu>
>On Fri, 21 Nov 2003, Dale Mosby wrote:
>
>>I recently bought an ICOM IC-2100H to run as an APRS unit
>>..., but receive current drain is listed in the manual as 0.8
>>amps!
>
>Yes, use an HT which should draw less than 10% of that.
>
>There are many 5W HT's available for about $100 I think. TX power is not
>an issue at all. Its the receiver power that is the bulk of solare power
>you will need.
>
>Bob
Bob, I've seen you write of this before and I scratch my head every time!
Even living in a desert rural community, the digi's in the area are
transmitting more than 50% of the time and I think to myself that what you
say just does not make sense.
Soooo, can I assume that you are speaking of just a mobile unit or portable
unit that may only transmit once every few minutes or so?
Another thing to consider is the GPS draw! These units like the Deluo and
others pull about 100ma all the time. This, along with a transceiver, can
add up.
On another point, I thinks it's interesting this hand help gps units can go
a day or so on a couple three AA cells but the Deluo type units pull so much
current!
Jim, WA6OFT
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Subject: Re: What low current draw radio for solar powered site?
From: Richard Garcia <k4gps@bellsouth.net>
Date: 22 Nov 2003 10:45:59 -0500
X-Message-Number: 6
I find it interesting that my RS GPS will run on 3 AAA's for about 1
week of work days. 8 or so hours a day plus a few more here and there
for the weekend.
I have never had a chance to measure current draw yet or modify it to
have external power, maybe next weekend I can put a 7805 in there.
Rich
On Sat, 2003-11-22 at 10:37, Spider wrote:
>On another point, I thinks it's interesting this hand help gps units can go
>a day or so on a couple three AA cells but the Deluo type units pull so much
>current!
>
>Jim, WA6OFT
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Subject: Re: What low current draw radio for solar powered site?
From: "Spider" <spider@rivcom.net>
Date: Sat, 22 Nov 2003 09:01:59 -0700
X-Message-Number: 7
From: "Richard Garcia" <k4gps@bellsouth.net>
>I have never had a chance to measure current draw yet or modify it to
>have external power, maybe next weekend I can put a 7805 in there.
Units like the Deluo or Motorola will darn near burn up a 7805. Out here,
you can not run a Deluo or Motorola off a 7805 without a significant
heatsink as it will go into thermal shutdown. It will burn you if you touch
it!
Jim, WA6OFT
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Subject: Re: What low current draw radio for solar powered site?
From: Byron Smith <wa6ylb@theworks.com>
Date: Sat, 22 Nov 2003 10:11:30 -0800
X-Message-Number: 8
I would like suggestions for a radio that I can put up at this site.
For sure you would want a crystal controlled radio at a solar site.
Synthesized radios draw too much just to generate the channels in the
radio. Choose a crystal controlled radio, since they draw the least
current.
I suggest Motorola's HT90/HT440 series HT's.
Check EBAY - they are quite reasonable. The HT90/440 should be "choice" for
this, since they run off of 12.5 V right out of the box. They come in 1
watt (h23) or 5 (H33) watt models. Dont worry if the radio has a PL deck in
it - its removable, to save current. Look for the model that has a remote
mic connector on the top of the radio (sixth position in the model number
is an "U"). Its perfect to make your connections to the TNC via this plug.
If you see a model number, look for H33HMUxxxx for VHF HT90's and or
H33LCUxxxx for VHF HT440.
Here is an HT90 with the remote mic connector.
http://cgi.ebay.com/ws/eBayISAPI.dll?MfcISAPICommand=ViewItem&item=3059675169
I have schematics for these radios in case you need some help.
TNC's? KPC3/KPC3+ for sure for current consumption.
I recently bought an ICOM IC-2100H to run as an APRS unit in my car. Price
on that was $140 which doesn't seem too bad, but receive current drain is
listed in the manual as 0.8 amps - more than I would like.
The HT90/HT440 should be between 15-30 milliamps max in standby.
As another choice for more RF output, I currently have a Motorola Maxar50
10 watt version crystal controlled radio running on a solar site. Pretty
compact, crystal controlled radio. If memory serves me correctly, the
current draw on this was around 120 MA after I removed the PL circuitry.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3060365228&category=296
This is a 30 watt version. The body of the radio is as thick as the control
head. 10 watt models have the same control head, but a much thinner body.
The model number changes to D23JAAxxxx for the 10 watt model. The 1100
portion of the model number after JAA means one channel, carrier squelch.
The one shown in the ebay ad above is a single channel carrier sq model 30
Watt version.
D33JAA1000AK
d =dash mount
3 =30 watt model
3 - VHF (4 if UHF)
JAA - Maxar 50 series radio
1000 = 1 channel carrier sq. IF 3xxx, PL 1 channel. 6xxx = DPL 1 channel
All versions can be made carrier sq by removing components. Pretty simple
to do. No microscopic parts in these radios.
Byron Smith
wa6ylb@theworks.com
http://www.theworks.com/~wa6ylb
What was the best thing before sliced bread?
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