Charging a Deep-Cycle Marine Battery; Is it dead?
Gents,
In advance of FD, I "inherited" a deep-cycle marine/RV battery and wondring if it's met its maker. Ostensibly in good condition (so sayeth the donor), it's been on an automobile battery charger for three days drawing about 5-6 amps with a terminal voltage of 9 volts.
I did the research but a lot of the info is "buy our miracle charger" or "revitalize your dead batteries with our wonder product", etc.
Any verdict on this; a few more days?
--
William, K6WHP
"Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"
|
Re: QRPguys multi-band EFHW tuner query
A comment related to what Shirley said ... I have had good luck building a 3 band (40m/30m/20m) EFHW by borrowing and applying the idea of a
segmented dipole. The 40m EFHW is physically broken into 3 sections via two insulators inserted so that the first (when viewed
from the tuner end of the wire) isolates a 20m EFHW, the next section when added on via a jumper (I use alligator clips and spade lugs) is resonant on 30m
and addding the last section makes it an EFHW on 40m. In fact I discovered that the 40m EFHW can be used as a 20m end fed full wave so really you just need to isolate the 30m EFHW section with a small insulator.
I use an EFHW tuner from Pacific Antennas that is modified (ala AA5TB) to use a toroidal transformer rather than a tapped inductor and I just use the appropriate
length short counterpoise wire for each band. It works like a charm and doesn't require messing around with traps.
Cheers
Michael VE3WMB
--
Michael VE3WMB / VA2NB
|
Re: QRPguys multi-band EFHW tuner query
Another option is the way LNR's Trail-Friendly End-Fedz works. It
handles 40 and 20 because they are harmonically related. But there is
also what looks like a short coaxial stub partway down the wire, but
it's really just a shorting jumper that connects the two wire segments
together. (The cable stub makes it harder to lose.) You remove it to
use the antenna on 30m, effectively shortening the wire to the correct
length for that band.
toggle quoted message
Show quoted text
On Thu, Jun 6, 2019 at 12:11 PM ajparent1/kb1gmx <kb1gmx@...> wrote:
Short form EFHW do not work well with traps easily.
To get 30M in the middle of 40 and 20 is difficult as 30M is not harmonically related.
To make it work you need a length that is a half wave for a multiple of a half wave at 40, 30,
and 20. 40 and 20 is easy. Its 30 that odd. with enough playing on paper you can get all three.
An easier way is a wire for 40/20 (about 66ft) and a replacement wire for 30 only or about
50ft.
However the problem is adding traps alter the wire length so you need the 30M trap
about 50 ft from the matching feed point. That will likely make the added length wrong
for 40M and 20M as it will behave like a load coil. ITs not the trap but its position and
loading of adjacent segments that is a problem to work out.
Keep in mind an EFHW is about 3000 ohms at the feed point at resonance and that
repeats every half wave. Traps work best at high current points or odd quarter wave
(middle of the half wave).
When I use mutiband EFHWs I stick to harmonically related bands or use wires cut
for a specific band. The latter give a more predictable pattern.
Allison
|
Re: QRPguys multi-band EFHW tuner query
Short form EFHW do not work well with traps easily.
To get 30M in the middle of 40 and 20 is difficult as 30M is not harmonically related.
To make it work you need a length that is a half wave for a multiple of a half wave at 40, 30,
and 20. 40 and 20 is easy. Its 30 that odd. with enough playing on paper you can get all three.
An easier way is a wire for 40/20 (about 66ft) and a replacement wire for 30 only or about
50ft.
However the problem is adding traps alter the wire length so you need the 30M trap
about 50 ft from the matching feed point. That will likely make the added length wrong
for 40M and 20M as it will behave like a load coil. ITs not the trap but its position and
loading of adjacent segments that is a problem to work out.
Keep in mind an EFHW is about 3000 ohms at the feed point at resonance and that
repeats every half wave. Traps work best at high current points or odd quarter wave
(middle of the half wave).
When I use mutiband EFHWs I stick to harmonically related bands or use wires cut
for a specific band. The latter give a more predictable pattern.
Allison
|
Preston,
I will be there off and on both Saturday and Sunday.
Mike Dooley,N5BGX in Wylie, TX
toggle quoted message
Show quoted text
On Tuesday, June 4, 2019, 10:54:38 AM CDT, Phillp Buck <buckpd@...> wrote:
Howdy,
Ham com is this weekend, in Plano, just north of Dallas.
I haven't attended in several years but am really looking forward to it.
Last week, I was looking at the various speakers and forums, when I noted
that Chuck will be doing a talk on home brewing at noon on Saturday.? That
set my schedule for the day.
Today I've found the updated presentation schedule and Chuck isn't listed
anymore.? Rats.? His presentation on home brewing was probably too much of
a threat to the Yeasu/Icom/Kenwood manufacturers and they used their clout
with the organizers to stifle him.
(On a serious note, I hope you're okay.)
There are some other decent talks so all is not lost.
Anybody else going to be there?
73,
Preston, n0glm
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
Thank you Richard.
I had not run across the ML1350 yet. Might be worth considering. Not much choice in distributor however.
The TL026 also looks interesting, good suggestion.
cheers, Graham ve3gtc
toggle quoted message
Show quoted text
On 2019-06-05 14:17, Richard Harris via Groups.Io wrote: Hi Graham,
The MC1350 is now made by Lansdale Semiconductor as part number ML1350.? I assume that Lansdale has acquired the rights to the design from Motorola (or the successor to Motorola Semiconductor).? Datasheet at
The Elecraft K3 uses a pair of ML1350 in the IF section.
An alternative voltage-controlled-gain IF amplifier IC is the Texas Instruments TL026.
Richard G3OTK
On Wednesday, 5 June 2019, 14:48:33 BST, Graham <planophore@...> wrote:
Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
cheers, Graham ve3gtc
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
Yes, there are a number of source still around, all old stock however.
I still have a few on hand but I was looking for modern options.
cheers, Graham ve3gtc
toggle quoted message
Show quoted text
On 2019-06-05 16:32, Bill Cromwell wrote: I noticed that Unicorn Electronics has them in stock.
73,
Bill? KU8H
On 6/5/19 9:48 AM, Graham wrote:
Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
cheers, Graham ve3gtc
.
|
Re: QRPguys multi-band EFHW tuner query
Glad you got it all going.? I'm a bit late to this, but wanted to chime in as another reference point for others.? My initial thought was that you had the tuner in line with the first length working.? But, when you added the trap and 30m section 20m no longer worked.? That would be indicative of the trap not doing its job.
The resources at the SOTABeams pico trap page are very helpful.
Pico Traps Kit (pair)
|
|
|
| | |
|
|
|
| |
Pico Traps Kit (pair)
Find great deals on SOTABEAMS for Pico Traps Kit (pair). Shop HF and VHF Portable Antennas and Accessories for A...
|
|
|
In particular, check out page 5 of this document.? It shows how to check that your traps are at the frequency you want them to be:?
I often use the G0POT design 20/30/40m trapped EFHW when /P QRP.
72 de Bryan, k0emtBryan Nehl (@k0emt) ? Instagram photos and videos
toggle quoted message
Show quoted text
On Friday, May 31, 2019, 8:29:58 AM CDT, Lloyd K3ESE <llachow@...> wrote:
first trial, backyard, 12V supply to my ATS4A, EFHW sloping upward to about 25-30' at the far end.
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
You can get them on eBay:
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
toggle quoted message
Show quoted text
----- Original Message ----- From: "K5ESS via Groups.Io" <k5ess.nothdurft@...> To: < [email protected]> Sent: Wednesday, June 05, 2019 10:18 AM Subject: Re: [qrp-tech] Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? Lansdale indicates Avnet is a distributor but I don't find this part on their site. Anyone know where to purchase small quantities? Mike K5ESS -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Richard Harris via Groups.Io Sent: Wednesday, June 5, 2019 9:18 AM To: [email protected]Subject: Re: [qrp-tech] Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? Hi Graham, The MC1350 is now made by Lansdale Semiconductor as part number ML1350. I assume that Lansdale has acquired the rights to the design from Motorola (or the successor to Motorola Semiconductor). Datasheet at The Elecraft K3 uses a pair of ML1350 in the IF section. An alternative voltage-controlled-gain IF amplifier IC is the Texas Instruments TL026. Richard G3OTK On Wednesday, 5 June 2019, 14:48:33 BST, Graham <planophore@...> wrote: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? cheers, Graham ve3gtc
|
Re: Is there a modern substitute or replacement for the ven erable MC1349 and MC1350 monolithic IF amplifiers?
MC1350 available Here: Ollie kolqk
toggle quoted message
Show quoted text
---------- Original Message ---------- From: "K5ESS via Groups.Io" <k5ess.nothdurft@...> To: < [email protected]> Subject: Re: [qrp-tech] Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? Date: Wed, 5 Jun 2019 12:18:10 -0500 Lansdale indicates Avnet is a distributor but I don't find this part on their site. Anyone know where to purchase small quantities? Mike K5ESS -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Richard Harris via Groups.Io Sent: Wednesday, June 5, 2019 9:18 AM To: [email protected]Subject: Re: [qrp-tech] Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? Hi Graham, The MC1350 is now made by Lansdale Semiconductor as part number ML1350. I assume that Lansdale has acquired the rights to the design from Motorola (or the successor to Motorola Semiconductor). Datasheet at The Elecraft K3 uses a pair of ML1350 in the IF section. An alternative voltage-controlled-gain IF amplifier IC is the Texas Instruments TL026. Richard G3OTK On Wednesday, 5 June 2019, 14:48:33 BST, Graham <planophore@...> wrote: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? cheers, Graham ve3gtc ____________________________________________________________ Meghan Markle Confirms Unfortunate News track.volutrk.com
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
Lansdale indicates Avnet is a distributor but I don't find this part on their site. Anyone know where to purchase small quantities?
Mike
K5ESS
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Richard Harris via Groups.Io Sent: Wednesday, June 5, 2019 9:18 AM To: [email protected]Subject: Re: [qrp-tech] Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? Hi Graham, The MC1350 is now made by Lansdale Semiconductor as part number ML1350. I assume that Lansdale has acquired the rights to the design from Motorola (or the successor to Motorola Semiconductor). Datasheet at The Elecraft K3 uses a pair of ML1350 in the IF section. An alternative voltage-controlled-gain IF amplifier IC is the Texas Instruments TL026. Richard G3OTK On Wednesday, 5 June 2019, 14:48:33 BST, Graham <planophore@...> wrote: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers? cheers, Graham ve3gtc
|
If you order some boards I would be willing to buy a couple.
73
Mark
AJ6CU
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
I noticed that Unicorn Electronics has them in stock.
73,
Bill KU8H
toggle quoted message
Show quoted text
On 6/5/19 9:48 AM, Graham wrote: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
cheers, Graham ve3gtc
.
--
bark less - wag more
|
Everything Has been sold
Thanks for the interest.
73
--
N8DAH
Shop.Kit-Projects.com ( HTTPS://Shop.Kit-Projects.com )
Kit-Projects.com ( )
|
Re: Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
Hi Graham,
The MC1350 is now made by Lansdale Semiconductor as part number ML1350.? I assume that Lansdale has acquired the rights to the design from Motorola (or the successor to Motorola Semiconductor).? Datasheet at
The Elecraft K3 uses a pair of ML1350 in the IF section.?
An alternative voltage-controlled-gain IF amplifier IC is the Texas Instruments TL026.??
Richard G3OTK
toggle quoted message
Show quoted text
On Wednesday, 5 June 2019, 14:48:33 BST, Graham <planophore@...> wrote:
Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
cheers, Graham ve3gtc
|
Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
Is there a modern substitute or replacement for the venerable MC1349 and MC1350 monolithic IF amplifiers?
cheers, Graham ve3gtc
|
U3S and SDR are sold
NorCal40 is pending funds
--
N8DAH
Shop.Kit-Projects.com ( HTTPS://Shop.Kit-Projects.com )
Kit-Projects.com ( )
|
Had a unexpected car repair and need to move a few things out of the shack.
I have the following all built by me.
Norcal 40A 10T-Pot, Solid 3w out tuned for 7.025-7.070ish at 690Hz with built in Touch keyer 4x100char memory with jackyack software. 100$ Shipped
Ultimate3S kit with GPS, 3x bs170 finals installed and filters for 15/20/30/40/80m bands factory reset. 100+ in parts asking 110$ Shipped wired stock for 5v.
Hilltopper20 with LCD mod installed with 3D printed mount. asking 115 $ shipped
HobbyPCB RS-HFIQ 5W SDR with IQ Keyer: comes with cables for audio and pc usb, sold new north of 350$ yours for 275$ Shipped.
Deluxe TennaDipper Custom enclosure 50$ Shipped
More pics for e-mail please contact direct/private gud on the zed Paypal preferred.
73
--
N8DAH
Shop.Kit-Projects.com ( HTTPS://Shop.Kit-Projects.com )
Kit-Projects.com ( )
|
Howdy,
Ham com is this weekend, in Plano, just north of Dallas.
I haven't attended in several years but am really looking forward to it.
Last week, I was looking at the various speakers and forums, when I noted
that Chuck will be doing a talk on home brewing at noon on Saturday. That
set my schedule for the day.
Today I've found the updated presentation schedule and Chuck isn't listed
anymore. Rats. His presentation on home brewing was probably too much of
a threat to the Yeasu/Icom/Kenwood manufacturers and they used their clout
with the organizers to stifle him.
(On a serious note, I hope you're okay.)
There are some other decent talks so all is not lost.
Anybody else going to be there?
73,
Preston, n0glm
|
Re: Preliminary results -- W8TEE/AC8GY Mag Loop Testing
On 06/01/2019 11:34:09 AM, Bill Cromwell wrote: [snip] What I learned in those days barely applies today.
Honestly, speaking as someone who programs for a living, you're probably in better shape for this than a college kid would be. Those old clunky machines you learned what you did on are much closer to Arduino and other embedded work than a modern machine is, as far as programming goes. -John -- John Maxwell KB3VLL jmax@... "Personally I'm fond of using Dedekind cuts for representing the Reals, but it gets cumbersome to use when balancing one's checkbook." -Charles Haynes
|
Shirley Dulcey KE1L
N8DAH
