From bcarling at cfl.rr.com  Mon Mar  3 21:45:40 2014
From: bcarling at cfl.rr.com (bcarling at cfl.rr.com)
Date: Mon, 03 Mar 2014 21:45:40 -0500
Subject: [DCboatanchors] Heathkit items - NOT MINE
Message-ID: <53153E54.17395.1310F1@bcarling.cfl.rr.com>

I saw this ad on another list and thought perhaps sme of you Heathkit aficionados 
might like to know:

These are NOT mine so please resist the urge to hit REPLY!

My apologies if this is too soon but I did want to get these two out on the list.

I have two more items FS - just off the shelf and making room on the bench for lots 
of other stuff that needs to be worked on.? First item is HW-12A 80M SSB mobile 
transceiver.? It does have the Heathkit mobile mount but does not include a power 
supply, microphone, the bottom feet or a manual. I have not turned it on I don't 
know if it works.? Generally seems to be all original, unmodified and in generally 
good condition.? Pictures at:
https://picasaweb.google.com/115279229771946172442/HeathkitHW1280MSSBM
obile?authuser=0&feat=directlink

HW-12A:? Asking $50 plus $25 for shipping and handling.

Second item is a Heathkit HRA-10-1 crystal calibrator. Looks to be in nice condition 
but I don't know if it works. A printed copy of a manual will be provided.? Pictures at:
https://picasaweb.google.com/115279229771946172442/HeathkitHRA101100KHz
Cabibrator?authuser=0&feat=directlink

HRA-10-1: Asking $25 plus $10 shipping and handling.? Willl combine.

Shipping continental US only. Payment PayPal preferred but check will be ok too 
(just a lot slower).

73
Bob Groh, WA2CKY

REPLY TO:
rgroh at swbell.net


Brian Carling, Radio AF4K

From bcarling at cfl.rr.com  Mon Mar 17 07:17:25 2014
From: bcarling at cfl.rr.com (bcarling at cfl.rr.com)
Date: Mon, 17 Mar 2014 07:17:25 -0400
Subject: [DCboatanchors] QST and John Dilks - FYI
Message-ID: <5326D9C5.25013.1A2FB7@bcarling.cfl.rr.com>

FYI guys:

(I wonder f there will be any more torch bearers like John Dilks?!)

> From: Ludwell Sibley <tubelore at jeffnet.org>
> Subject: [AWA] John Dilks and "QST"
> To: antiquewirelessassociation at yahoogroups.com
> Date: Sunday, March 16, 2014, 2:32 PM
 
> Well, the April
> issue of "QST" has arrived, with
> an announcement that K2TQN is hanging it up after producing
> 180 or so "Vintage
> Radio" columns.? Some rest would be in order
> after his being on
> monthly deadline for 15 years.? John originated the
> idea for the column
> and made it happen.? The diversity of topics in it has
> been
> remarkable:? famous early hams, important early
> commercial operators,
> significant early amateur stations, major wireless
> installations, the "Titanic"
> episode, favorite tube-era rigs, on and
> on. 
 

> As regards AWA,
> Dilks has contributed mightily to the
> Rochester meet over the years and has given lots of
> "good press" to
> the Museum.? He is the only individual to hold both AWA
> Houck
> Awards:? for both Documentation and
> Preservation. 

> We all owe
> vigorous thanks and congratulations to John for
> his achievements.? I hope that attenders of next
> week?s Carolinas
> Conference will pass this sentiment on to
> him! 
 
> Ludwell
> Sibley 
Brian Carling, Radio AF4K

From bcarling at cfl.rr.com  Sat Mar 22 10:31:20 2014
From: bcarling at cfl.rr.com (bcarling at cfl.rr.com)
Date: Sat, 22 Mar 2014 10:31:20 -0400
Subject: [DCboatanchors] Single Tube Transmitter Notes
Message-ID: <532D9EB8.32732.8149ED@bcarling.cfl.rr.com>

Some suggestions for anyone thinking of building a single tube transmitter.

I have found that you CAN get a fairly clean signal out of a single tube transmitter but it 
requires some attention to your antenna match AND to regulating your power supply.? Also 
take care to limit crystal current. The use of a? single tube transmitter is a compromise 
involving power output, keying, antenna coupling and crystal current on operation.

Let's take these in order:

1) You do not want to overcouple to the antenna and push these little single tube rigs to their 
maximum power capability by heavy loading. Reduce the loading just a little and they are less 
likely to pull and chirp. It is especially difficult to build a clean one tube rig using larger tubes 
above a few watts.
?
2) Power Supply - needs to be large enough for the job. If you use the typical receiver 
transformer that can only supply 5 - 10 watts and try to run a single tube transmitter off it, the 
supply is going to diip a little as you key down and you will hear a yoop sound as the 
frequency pulls. There are two helpful things to keep in mind as you plan the PSU for a single 
tube rig transmitter. Have a stiff plate supply. One that does not drop voltage much when you 
key down. ALSO - if you use a tetrode or pentode it is important to regulate the screen 
supply, especially as you get above 4 MHz. For 160 and 80 you might get by without 
regulating it, but I still recoomend using regulation for any single tube rig.?

If you really want to use the larger tubes, you are going to need a regulator.
It is much easier to regulate the screen than the plate voltage.? You can easily come up with 
screen voltages of 75V, 90V, 105V, 150V, 165V, 180V, 225V, 240V, 255V or 300V using 
series combinations of the following regulators:

OA3, OB3, OC3 and OD3 are octal regulator tubes providing 75V, 90V,? 105V, and 150V 
respectively and need to sink 5 - 40 mA each. ideally set them to pull in the middle of that 
range. You want the resting current and the key down current thrugh your regulator, to both 
fall within that range

OA2 and OC2 are 7 pin miniature regulator tubes providing 150V and 75V respectively and 
need to sink 5 - 30 mA each. Again, select your resistive dividing network so that they to pull 
quiescent current in the middle of that range.

For example, if you want to provide a 225V screen voltage to your 6L6 or 6V6 rig, put two of 
these tube sin series and do the mathemtaical calculations for a resistive dividing network as 
described in ARRL Handbooks or at various web sites such as:

http://www.junkbox.com/electronics/sheets/GE_Glow_Tubes_ETI-176.pdf

3) Antenna coupling - Again, I prefer a pi network though some guys do OK with link coupling 
if it is designed and adjusted correctly. I find it is easier to get a match with a Pi Network 
output to the antenna rather than the link coupled designs of the 1930s. I can usually get 
more power out this way and be able to match a wider range of antenna impedances seen by 
the transmitter.

4) Crystal current. Much has been written about using various crystals but by far the most 
easily available of the these today are the FT243 crystals from AF4K that have been 
remanufactured using newer hc49 crystals inside. TO be sure these can work 100% fine in 
all transmitters using low level oscillators such as a 6CL6 - 6146 rig, or the usual 6AG7 - 807 
nostalgia transmitter that many hams have built either in their novice days or as a fun 
homebrew rig today.? Many of the old Heathkits used this type of two simple stage design and 
rigs like these with 2 or 3 stages are by far the easiest to use with any crystals including the 
newer crystals.

Bear in mind that many crystals have smaller quartz elements inside. This has been true for 
many years, long before we started doing it at AF4K Crystals. I have meny examples of older 
FT171B and FT243 crystals that had small adapters and much smaller crystals inside and 
can send photos of these to any doubters. David Ishmael, WA6VVL seems to be unaware of 
that in his article in Electric Radio this month. Do NOT assume that a large FT171B crystal 
has the large element inside and fry it in your 813 single tube crystal cracker (why anyone 
would want to build a single tube 813 rig is beyond me!!) A good number of the older FT171B 
crystals I have opened up have ana dapter and a very small crystal from an FT243 inside 
them! At least he does not mention this in critiquing the use of our smaller crystals.

Some folks have had difficulty with their AMECO AC-1 or their homebrew single stage rigs 
either chirping or drifting as the crystals heat up with the modern smaller crystals inside.?
Thi is very definitely avoidable.? I have heard clean AC-1 signals using our AF4K crystals. 
The crystals will very rarely ever break because they CAN take the current. They just get too 
hot if you hold the key down continuously with over 35 mA.? Any crystal will. Crystal current is 
affected by several things. The applied voltage. The ESR (Equivalent Series Resistance) of 
the crystal and it's ratio to the other circuit parameters. Again, these will be affected by the 
circuit design chosen. The worst of all is the TRI-TET design also known as the "Crystal 
Cracker" by many hams because they had disappointment when their crystals broke in this 
circuit Yes, it happened frequently with the old original FT243 crystals much to the sorrow of 
our early novices. We strongly recommend that you only use the safer designs such as the 
Pierce and "Colpitts" capacitive divider type oscillators.

As to our crystals - a good number of the ones we have for sale are original larger FT243 
rocks inside, but many are not. Especially the ones outside the typical ranges used by the 
miltary in WW2.? Some have been told that they fail, but that is not correct.? Only if someone 
wants to use an 813 power oscillator and run 200 mA through the crystal or something silly 
like that. Even the old original FT243 crystals were recommended to NOT run greater than 
60 mA of current through the crystal. If you look at some of the old ham construction articles, 
they often recommended the use of a 60 mA pilot lamp in series with the crystal to estimate 
RF current and limit it to a safe level.

Interestingly - the study by G3UUR found that our crystals will withstand as much as 200 mA 
through them before failing and even then it was not the quartz itself thhat failed but the 
connecting welds inside the case.

There are thousands of these crystals in use daily around the world in Heathkit, Drake, 
Hallicrafters, Gonset and Globe rigs; even in BC610 military 350 watt transmitters.? My 
crystals were recommended for use in the older tube rigs by Dave Ingram, K4TWJ in his CQ 
Magazine articles before his untimely death a couple of years ago, and were also the subject 
of some serious scientific examination by Dr. David Gordon-Smith, G3UUR Materials Scince 
Professor in an 8-page article in Electric Radio Magazine.

I stand behind these updated FT243 crystals.? I can assure you that if any crystal fails you, I 
will replace it or refund the money if you are disappointed in any way.

These crystals can easily withstand 40 mA. They only drift or chirp in certain rigs that are not 
adjusted well. For single stage tetrode or pentode rigs, regardless of what type crystal you 
use, I strongly recommend that you use a regulated screen supply. See above.

Final notes on building One tube transmitters:?

There is a nice example of a CLEAN sounding one tube 6L6GC transmitter that is run at 
350V DC on the plate and a regulated 225V screen supply designed and built by N4QR 
available here:
http://af4k.com/6L6_XMTR_by_N4QR.jpg

I contacted N4QR on this rig. He uses our remanufactured FT243 crystals for a great 
sounding signal on 80m. His 6L6GC rig sounded clean as a whistle.

Some excellent additional notes by AA8V, Greg Latta may be found here:
http://faculty.frostburg.edu/phys/latta/ee/6cl6xmtr/6cl6why6cl6.html

See you in MAY 2014 for the special WES event featuring single tube transmitters!

Mine will be on the air with a clean signal!

73 de AF4K, Bry Carling
SKCC #1879 TX5

http://skccgroup.com
http://af4k.com
??
Brian Carling, Radio AF4K

From kenw8ek at gmail.com  Thu Mar 27 10:53:48 2014
From: kenw8ek at gmail.com (Ken Simpson, W8EK)
Date: Thu, 27 Mar 2014 10:53:48 -0400
Subject: [DCboatanchors] Boatanchor and related items FS
Message-ID: <53343B7C.7030008@gmail.com>


Boatanchor and related items For Sale:
6JS6 Tubes, Bencher Iambic Paddle, HyGain Digital
Rotor Control, Communications speakers, Active Audio
Filter, Antenna Tuners, Noise Filter/Surge Supressors,
Low Pass TVI Filters, Reference Books, Coax Switches
and Connectors, etc.


Pair of 6JS6 Tubes:
These are NOS (New, but old stock) RCA 6JS6C tubes.
They were originally used for spares for a Yaesu FT-101,
but were never used. Of course they can be used in other
rigs as well. $50


Bencher BY-1 Iambic Paddle:
The Bencher Paddle is what others are judged by!
The BY-1 has a very heavy black base with chrome parts,
and includes gold-plated solid silver contract points.
This one works fine and looks really great.
No scratches or defects.  With paper work for $70.


HyGain DCU-1 Deluxe Digital Rotor Control Box:

The innovative DCU-1 Pathfinder Digital Rotor control unit
gives you automatic operation of your brake and rotor. It
has computer control with RS-232 pass through and is compatible
with many logging and contest programs as well. It has 6 presets
for your favorite beam settings, 1 degree heading accuracy,
automatic 8-second brake delay, and 360 degree choice for
center of rotation. It operates at 110V.

The DCU-1 digital rotor control unit is compatible with the
T-2X, HAM-IV, and HAM-V families of rotators.

This unit works fine and looks fine as well.
Paper work is included for $450.


Communications Speakers:

Realistic 21-549 A
This speaker is about 4 inches square and about 2 inches
deep. It is rated for 5 watts, has an 8 ohm impedance, and
is listed as a 300 to 3000 Hz frequency response, making it
ideal for communications. It has a 3.5 mm (1/8 inch) mono
plug, as used by most modern rigs. Gimbal mount included.
It is black in color, looks great, and sounds great. $12

Vanco SPB-5
Appears to be the same at above, but with a Vanco label.
Also includes gimbal mount. $12

Vanco SPB-6
Similar to SPB-5 above, but is considered a noise
cancelling speaker. 10 Watt rating. Still in original
box, new. $18


Variable Active Audio Filter:

The Prime PR-1000 basically functions the same as an Autek
QF-1 audio filter, meaning that it can either notch, peak,
or act as a low pass filter. The frequency of the notch,
peak, or low pass is adjustable, as is the width. This
filter inserts between the receiver (or transceiver) audio
output, and the speaker. It is powered by 110 V AC, and
has a very long (about 8 feet) power cord.

This particular unit works fine. It appears that it is
probably new, in that I can find no cosmetic defects, and
it is still in its original box, with the paper work. $45


Antenna Tuners:

All of these tuners are good for a 100 W HF rig. Although
they might be rated to take slightly more power (200 or
300 watts), they are not suitable for use with an amplifier.
All include a built in balun.

TenTec 291 Tuner
This is a "T" network tuner that uses a 47 tap rotary
inductor which permits almost infinite adjustment.
This one works fine and looks like new.
With paper work for $70.

Dentron "Jr Monitor" Tuner
Covers 160 thru 10 meters, and includes a relative RF
output meter.
This one works fine and looks great.
With paper work for $ 60


APC "Pro 7" Noise Filter and Surge Suppressor:

This unit has 7 outlets, with a 6 foot cord, and provides
surge suppressor for your equipment. It also provides
noise filtering / EMI / RFI suppression of 60 db. There
is $75,000 worth of insurance included. It comes with a
lifetime warranty, and I think this is APC's "Top of the
line" unit.

Detailed specs can be found at
http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=PRO7

This one appears to be new, unused, in its original box.

Only $18.


Noise Filter and Surge Suppressor:

This unit is still in its Radio Shack (#61-2327) box, never
used. It says it is for a notebook computer, but it can be
used with anything. It has connections for a computer network
(LAN, RJ-45 connector), the AC power, and for phone lines
(RJ-11 connector), and provides noise filtering and surge
suppression on each. It even includes $25,000 insurance
against surges. Maximum power rating is 1875 Watts, or 15
amps. Noise filtering is listed at 40 db.

This unit is new, in its original box, with its original
paper work. $15


Low Pass TVI Filters:

A low pass TVI filter is added to the transmitter to reduce
harmonic interference. All have SO-239 connectors and are 50
ohm filters.

Johnson 250-20
This cylindrical low pass filter has a cut off frequency
of 45 MHz and 75 db of attenuation, and is adjustable.
Rated at 1000 Watts AM, or 5000 Watts PEP SSB. $30
With mounting bracket, $35.

B & W 425 (same as FL-10/1500)
Cuts off just above 10 meters, and handles 1500 Watts.
Newer case style, $30.
Older, heavier copper style case, painted gray. $35

Para Dynamics PDC 1089
This filter is rated at a full Kilowatt, up to 30 MHz.
5 x 6 x 2 inch black box, instead of the long enclosure.
$25

Drake TV-5200-LP
This filter may also be used on the low end of six meters,
as well as HF. It is good for 1000 Watts "average" below
30MHz, and about 200 W up to 52 MHz. It is the newer version
of the TV-1000. $25


Reference Books:


Reference Data for Radio Engineers:

This book published by Sams/ITT is similar to an
ARRL Handbook, but in more depth and detail.

This book is loaded with tables and charts necessary in
communications. Excellent resource book when looking for
data, from the acoustic spectrum to radio wave propagation.

Sixth Edition printed in 1978.

This one is hardback, and it is in excellent condition,
close to new. The cover does not even appear to be worn.
Only $70.


Terman Classic Engineering Book:

Radio Engineering by Terman
McGraw Hill Electrical and Electronic Engineering Series
Third Edition, 1947 - close to new condition
Hard bound - $28


B & W Coaxial Antenna Switches:

All have SO-239 connectors, and will handle full legal power.

B & W Model 550 A coax switch
This model will switch up to 5 antennas, and does NOT
ground unused antennas. It has the coax coming out the
sides like spokes of a wheel.
This one works fine and looks fine as well. $40


Two position "Strip Line" Coax Switches:

These switches utilize professionally engineered all
metal cavity construction for maximum efficiency and
high isolation. Isolation is typically better than
50 dB at 300 MHz with insertion loss less than 0.2 dB.
All are two position and use SO-239 connectors, are
50 ohm impedance, are typically rated for 2.5 KW PEP,
and good to 600 MHz.

All work fine and look extremely nice.

Diawa CS-201 - $22

Opek CX-201 - $22

MFJ 1702 B
With Center position that grounds both antennas. $18

MFJ 1702 C
As 1702 B, but with added lightning protection. $25


Coaxial Cable with "N" Connectors:

This cable has a male "N" connector on each end.
It is about 60 feet long.

The coax is labeled 50-2 V, which is slightly
larger in diameter than RG-8 X, but not quite
as large as RG-8.

This piece is in extremely good condition, with heat
shrink around the connectors for strain relief.
$35


Coax connectors and adapters:

Prices are per connector. Several of each are available.
Most are unused.

SPECIAL: Buy 5 and take 10% off.
Buy 10 or more and take 20% off.

I also have a variety of "N" connectors available.
What do you need?

UG-175 reducing adapters for PL-259 connectors to
use with RG-58 $.50

UG-176 reducing adapters for PL-259 connectors to
use with RG-8 X or RG-59.
Amphenol, still sealed in the package $1
Loose, not in package $.50

Amphenol crimp type PL-259, sealed in package $3

UHF double female "Barrel connector" $3

UHF "Bulkhead Connector" with mounting hardware
Double female, about 2 inches long $6

UHF "T" connector with two female (SO-239) and one male
(PL-259) connection $5

BNC HT to PL-259 adapter.(BNC male to UHF female) $5

BNC male for coax cables
standard type $2
crimp on type $3

Chassis mount BNC female
square mount (uses 4 screws) $3
Amphenol screw in type, sealed in package $4

BNC "T", two female and one male $3


I also have many other accessories available such as many
different types of microphones, HTs, HF, VHF and UHF rigs, HF
and VHF/UHF antennas, and many miscellaneous accessories.
Just too many to list here. Please e-mail your requests.


Prices do not include shipping from Florida.

Thanks.

73,

Ken, W8EK

Ken Simpson
E-mail to W8EK at FLHam.net or W8EK at arrl.net
Voice Phone (352) 732-8400










