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 51 
 on: Today at 05:42:02 PM 
Started by K3ZL - Last post by W6OP
Agree, I have mine on.

Pete W6OP

 52 
 on: Today at 05:40:44 PM 
Started by KJ4IOR - Last post by W6OP
I am sticking with the 5.xx version. I have a Flex 5000 and don't need all the radio control stuff. I really only use the logbook and cluster. It's too bad they won't sell the logbook separately, they would have a sale.

Pete W6OP

 53 
 on: Today at 05:35:35 PM 
Started by K9QR - Last post by W1JKA
Re: K9QR

As per SKN you might want to consider rg8x for the feed line especially if you do all seasons backpacking in other than fair wx conditions. As you know, rain, heavy dew, ice, rime and snow on ladder/window line can adversely affect your Signal and SWR, also as with my backpack the 30 ft. of 8x and both my 20m and 40m dipole wires/securing line all roll up into neat 12 in. dia. coils that fit unobtrusively between my ALICE pack metal frame and pack. If you go on frequent group QRP hikes, SOTA and campground trips you will seldom see any type of balun in use for dipole wire antennas for reasons you have already noted. At any rate get out of Dodge as often as you can and have some portable QRP fun.

 54 
 on: Today at 05:27:12 PM 
Started by KB1IRC - Last post by KA4NMA
Check out k0bg.com, a great mobile website.  Also check out sgcworld.com for some ideas and tips.

Randy ka4nma

 55 
 on: Today at 05:24:33 PM 
Started by AD5IW - Last post by AC5UP
Apparently only a select few among us recall the earliest of tubes like DeForest's Audion used a directly heated cathode... 
The 2A3 is well regarded among audiophiles by virtue of its extreme simplicity. No screen grids to get between you and
the music, it's like half of a 5U4 but with a grid so it can amplificate:



Then, you may ask, how does one utilize a device like this?  Observe.........



The filament is grounded through an R/C network much like a 6V6 cathode, but with the addition of a 100 Ohm potentiometer adjusted with great care to the null of the filament voltage.
The concept is so exquisitely ancient it's like drinking the primordial (triodial) soup of audio.........    Roll Eyes

 56 
 on: Today at 05:18:27 PM 
Started by KB3MDT - Last post by AD4U
I have restored around 40 boat anchor receivers, transmitters, and transceivers from 1950-1980.  I have them all.  IMO you can only make a little $$$ if you do not count the value of your time.  Even figuring minimum wage ($7.25 / hr) you will be hard pressed to buy a boat anchor, clean it, diagnose the problem(s) which is the BIG time consumer, purchase the needed parts, install the needed parts, align the radio, possibly paint the cabinet, and then make a profit.

I spent 3 1/2 years doing a complete body off frame restoration of a 1955 Chevy Bel Air two door hard top in the mid 1980's.  This was not what some purists would consider a professional restoration, but the average Joe would think the car just came off the show room floor.  I sold it to generate some $$$ to start my business.  When I sold it I lost my butt.

Dick  AD4U

 57 
 on: Today at 05:18:25 PM 
Started by KW4CQ - Last post by W6GX
Interesting note on the ALC.  I'd like to understand how it works (ie how does the 990 know when to start to cut back on power).

Also interesting note on the consistent drive power by band.  I don't have too many experiences on amps. On mine the output varies by and.  The band requiring the least drive is 17m.  The band requiring the most is 10m.

73,
Jonathan W6GX

 58 
 on: Today at 05:12:54 PM 
Started by KB3MDT - Last post by K2OWK
Restoring old electronics is a very rewarding and fun hobby. I have been doing it for more then 50 years. I do not worry or even think about selling my restored equipment for profit or not. I give some to the local museum where others can see what used to be. I love hearing music and shortwave from my restored National NC-98 or my 50+ year old Emerson 4 tube sort of pocket radio (had to fabricate a 67.5 volt "B" battery from series of 9 volt units to fit the small battery box, lucked out on the filament battery as it was a "D" cell). I had this type of radio bought for me new in 1947 as a present. It cost $39.95 then. I could go on and on, but I will not.

Replacement tubes and most components for these radios are inexpensive, if you look around. New old stock and new tubes are available for about the prices they sold for in the years produced. I buy the ones I need for $3.00 to about $15.00. EBay is not the best place to buy tubes. Do a Google search for stores that have the best prices. Other components (unless special) are also available at a good cost. Check around.

Restoration is fun and rewarding.

Just an opinion.

73s

K2OWK

 59 
 on: Today at 05:09:03 PM 
Started by KW4CQ - Last post by KK6GMN
Thankyou for the update.  Very interested in your tests at 1200W.

Please keep them coming.


Thankyou,
73,
Mike


  Mike,

  I put my 1KW tuner in bypass mode on 20m and my Hexbeam has a very flat swr on that band.  I was easily able to get 1200w out with 55w drive.  I did not go beyond that drive.  The manual says to drive to 100w on the radio or 1200w on the amp which ever comes first.  In my case with a CW tone it came 1200w came at 55w on the 990.

 60 
 on: Today at 05:05:12 PM 
Started by KW4CQ - Last post by KK6GMN
I assume you have the ALC set at or close to 1200 watts.  The ALC provides an extra layer of protection when driving a SS amp using a 200w rig.  On my rig I also set it such that the max output is 100w no matter how far I crank the power knob.  I don't know if the 990 has this feature.

73,
Jonathan W6GX

With the cable in place, the ALC is handled by the rig, not the amp.  The knob on the amp does nothing to the power output in this configuration that I can tell.

Your info about max power is well noted and the 990 does have that ability.  I am still working out how I will use this feature.  The thing is if the max power were 100w, it might be an easier thing to do, but if I m driving near 1200w at 45w power... then setting max to 45 seems less likely since running barefoot sometimes will be the case and 45w will just not do. 

I have a question into Ameritron about the Max power and wills see what they recommend.  For now, I am just being super vigilant.

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