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   Home   Help Search  
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 91 
 on: Yesterday at 08:02:04 PM 
Started by KK5Y - Last post by K5LXP
My old tractor with a 6 volt battery can sit for many months and thru winter at times and will still start on its own

That doesn't mean it didn't self discharge, it just means it had enough capacity left over to still start your tractor.  The rating I've seen for flooded batteries is 15% per month at 25C.  At cooler temperatures it would be less, so not hard to picture a useful state of charge even after a few months during the winter.

Mark K5LXP
Albuquerque, NM

 92 
 on: Yesterday at 07:56:01 PM 
Started by N4SRN - Last post by K5LXP
My favorite project enclosures are salvaged from serial and printer A/B switch boxes of yore like these:


I often find these at swapmeets and fleamarkets for as little as a dollar, or even free.  The cases come apart with a couple screws, and .060" PCB material is a perfect replacement for the end panels.  There are standoffs molded inside for mounting PCB's.

They're great for station accessories like the antenna switch/control indicator box I built:


Lower right is an example of a K1EL keyer I made in one of these boxes:



The two N5DRV keyers in the photo I bought at Hamcom last summer from a silent key estate.  He liked the same boxes I do, and he also built one into an enclosure you used to be able to buy from Ten Tec.  The upper left keyer with the palm mini paddle is a K1EL I built into a Pamona mini project box.

For the front panels I print the graphics on two 4x6" shipping labels.  One label is used as a drill template and the second one gets applied after all the holes are drilled and panel de-burred.  A self adhesive clear laminate is put over that for a glossy durable surface.  Printing inverse (white on black) gives projects a silk screened appearance. 

Hard to beat such a versatile and nice looking enclosure, especially for a dollar (or less).

Mark K5LXP
Albuquerque, NM



 93 
 on: Yesterday at 07:55:42 PM 
Started by W5KUB - Last post by W5KUB
Katie Allen WY7YL is back this week! Guests include Michael Kalter W8CI, and Ron Cramer KD8ENJ from DARA to give us an update on the new Hamvention. We will also show Randy’s (K7AGE) box opening of the new Bitx40 Raduino., Plus more. Amateur Radio Roundtable is seen every Tuesday night at 8:00 PM central on W5KUB.COM. This show is also simulcast of famous international radio station WBCQ on 5130 KHz. (for intl the time is 0200 UTC Wed)

 94 
 on: Yesterday at 07:54:03 PM 
Started by W5KUB - Last post by W5KUB
Katie Allen WY7YL is back this week! Guests include Michael Kalter W8CI, and Ron Cramer KD8ENJ from DARA to give us an update on the new Hamvention. We will also show Randy’s (K7AGE) box opening of the new Bitx40 Raduino., Plus more. Amateur Radio Roundtable is seen every Tuesday night at 8:00 PM central on W5KUB.COM. This show is also simulcast of famous international radio station WBCQ on 5130 KHz. (for intl the time is 0200 UTC Wed)

 95 
 on: Yesterday at 07:53:23 PM 
Started by W5KUB - Last post by W5KUB
Katie Allen WY7YL is back this week! Guests include Michael Kalter W8CI, and Ron Cramer KD8ENJ from DARA to give us an update on the new Hamvention. We will also show Randy’s (K7AGE) box opening of the new Bitx40 Raduino., Plus more. Amateur Radio Roundtable is seen every Tuesday night at 8:00 PM central on W5KUB.COM. This show is also simulcast of famous international radio station WBCQ on 5130 KHz. (for intl the time is 0200 UTC Wed)

 96 
 on: Yesterday at 07:45:28 PM 
Started by CHRISDX - Last post by NN2X
SB 220!

 97 
 on: Yesterday at 07:17:44 PM 
Started by W5AGK - Last post by W1VT
The A23 battery is used in wireless doorbells.  It is available in Target, Lowes, and Home Depot stores.  The nearby Lowes says it has 41 in stock.

 98 
 on: Yesterday at 07:16:50 PM 
Started by K6DTF - Last post by KA4NMA
Right, I was not trying to be misleading.  I was trying to be helpful.

 99 
 on: Yesterday at 07:03:43 PM 
Started by K3STX - Last post by K3STX
I simply connected pin 2 or 6L6 #1 to pin 2 of 6L6 #2, then pin 3 of 6L6 #1 to pin 3 of 6L6 #2, etc... I added a screen grid dropping resistor to EACH 6L6. When I key it up, I actually have LESS output than with one 6L6!! I did this one REALLY simply; I did NOT add parasitic suppressors to the plate of each 6L6 and did not add a neutralization circuit.

If it was only that simple. You cannot simply wire from pin to pin.

Why not? I can show you diagrams from QST from the 1950s doing precisely that (but I concede I did NOT include the parasitic suppressors on the plates of each 6L6). But it obviously did not work well; my question to those who know alot more than me is WHY NOT? I can not include ARRL links here, but what I followed was  a Lew McCoy article from Jan '57 QST "6L6GB's in a 2-Stage Novice Rig". Unlike the one described in the article, mine has an "untuned" oscillator output.

paul

paul

 100 
 on: Yesterday at 06:48:28 PM 
Started by KE4KY - Last post by WD9Q
I saw some discussions about shelters.

You might want to consider these for future DXPeditions.

http://www.intershelter.com/polar.html

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