Just stop all this and go buy one
Lots of them listed under Ham Radio Dummy Load on e-bay at about a
buck a watt.
I bought a NARDA 40w load with N-connector good to 12.6 GHz for $40
(from a friend on-line).
Yeah I had a 100w light bulb and a Heath Cantenna way back
Now mine mostly made by
Checked my Cantenna today, 78 ohms.
Took it apart, even measured the raw resistor.
Ordered a replacement from Alan W1GA as someone else mentioned.
eBay # 221724743523 for description and options
Easy disassembly and price war right ... $24.50 shipped.
Thanks for all the info on DL's.
73
I think I have a roll of 12 Ohm 2w resistors at home. If you use 9 in
series and 8 in series, then connect those two stacks in parallel, you will
get 50.8 ohms, and I think about 20w of power handling...not sure on the
power...if someone wants to run that through the Cray and get the exact
Mine works fine at 220, VSWR on 440 is about 1.3:1 and rising fast. On
the QRP one I made, I left about 1 leads on the resistors, I had a
small brass tube to connect the center conductor down to the bottom
plate and I didn't want to cut it. VSWR on 6 meters is 1.6:1.
73,
Fred K6DGW
-
You can often find Dummy loads at your local Ham Flea. I found two 50
Watt Birds
for $10 each at the last one.
73, Dick, W1KSZ
On 3/26/2015 11:15 AM, Fred Jensen wrote:
Mine works fine at 220, VSWR on 440 is about 1.3:1 and rising fast.
On the QRP one I made, I left about 1 leads on the
/2015 1:28 PM (GMT-05:00)
To: elecraft@mailman.qth.net
Cc:
Subject: Re: [Elecraft] Fw: Don't have a 50W dummy load
Checked my Cantenna today, 78 ohms.
Took it apart, even measured the raw resistor.
Ordered a replacement from Alan W1GA as someone else mentioned.
eBay # 221724743523
When I came home from Vietnam in 1967, my new wife bought me a Swan 500.
Our next station was to NASA in Houston. We got settled into an
apartment, and I needed to fill my Cantenna so on Sunday [first clue],
we went to the local grocery store to get a gallon of Squibb mineral
oil. It only
These are the sort of things i look for at hamfests and other electronic
flea markets (what the locals call swap meets). I have several 10W 50
ohm loads, 100W loads, and even one 500W load. All are commercial
quality, removed from 2-way or cell sites. And, of course, as others
have noted,
ORIGINAL MESSAGE (may be snipped)
On Wed, 25 Mar 2015 12:05:18 -0700, you wrote:
The key word is Resistive.
REPLY:
I have used light bulbs in the olden days, although not for the K3 cal
procedure. The trick is to insert a variable cap in series to tune out
the
I suspect the TX Gain Calibration would fail due to High SWR.
Yes, TX CAL will do that. You need a good 50 ohm non-reactive dummy
load good to 54MHz.
Light bulbs worked well with old transmitters that had an output circuit
that could match most anything. We did not need tuners back then -
For the calibration procedure, you need the load to be a known 50 ohm resistive
impedance. Using a 100W light bulb will not provide the required impedance, and
will produce inaccurate results and possible damage the transceiver.
73, Matt VK2RQ
On 26 Mar 2015, at 5:25 am, Bob Gibson via
HOW ABOUT A LAMP WITH 100 WATT BLUB, THATS ALL US OLD GUYS HAD! 73s Bob W5RG
- Forwarded Message -
From: Warren Merkel hullspee...@gmail.com
To: elecraft@mailman.qth.net
Sent: Wednesday, March 25, 2015 1:17 PM
Subject: Re: [Elecraft] Don't have a 50W dummy load
That kit
Us old guys had tough tube transmitters with widely tunable output
networks that made the rigs more tolerant to our general abuse of known
electronic theory.
Eric
KE6US
On 26 Mar 2015, at 5:25 am, Bob Gibson via Elecraft
elecraft@mailman.qth.net wrote:
HOW ABOUT A LAMP WITH 100 WATT
That will cause the owl to blink, thus losing orientation to True North.
Mike NF4L
On Mar 25, 2015, at 14:25, Bob Gibson via Elecraft elecraft@mailman.qth.net
wrote:
HOW ABOUT A LAMP WITH 100 WATT BLUB, THATS ALL US OLD GUYS HAD! 73s Bob W5RG
this)?
The key word is Resistive.
73,
Cliff K3LL
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Matt
VK2RQ
Sent: Wednesday, March 25, 2015 11:52 AM
To: Bob Gibson
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Fw: Don't have a 50W dummy load
Ummm ... several reasons. Resistance component of an incandescent bulb
impedance varies with the temperature [brightness] of the filament.
They are also somewhat reactive. Push-pull vacuum tubes and link
coupling didn't care about SWR, I don't even remember the term in the
ham lexicon until
Yes, but the inductances are all in parallel. I built a decent dummy load
out of 24, 1200 Ohm, 10 watt wire wound resistors all in parallel between
two squares of fiberglass PC board. The SWR was only about 1.2:1 on 15
Meters and about 1.5:1 on 10 meters. Admittedly, not a perfect load, but
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