No, this set up is intended just for home QTH use, only do limited WW2 era stuff in the field and that’s at the Hamvention. Oddly this very T-19 is the same T-19 I used for the WW2 3885 Pack Net at the Hamvention this year along with solid state modulator, power supply and a 1936  RCA receiver but that’s another story. Think I will try the autotransformer idea being that I have a good 80 meter dipole that’s coax feed and would want to use that instead of putting up a new end fed along with the issues of bringing the end fed into the shop.

Did look at the bone stock Inductive Link Tank into a 50 Ohm load and was looking at second and third harmonic suppression of between 36 and 40 dB down from the carrier and although would consider that bad for any modern transmitter for something as old as the T-19 and at ten watts willing to live with it, think 36 down at the second harmonic, forty meters would be less than 10 mW I did install a two turn coil and a 25 pF cap at the coax connector that knocked most everything beyond 14 MHz down below 50

Attached is a picture of Joe, W4VAG running the 3885 net using the same T-19.

Ray F/KA3EKH

Ray,

Are you using this setup in the field? If so why don't you simulate the antenna installation on a plane? Feed an end fed wire and simulate the plane body with radials? See if you can get an output using the original tuning components.

Mike N2MS

On 08/09/2023 11:23 AM EDT Ray Fantini <[email protected]> wrote:

In a world of Pi output tanks, I know that the Old School approach of an Inductive Link tank is not cool, but if you look at the original design of those transmitters that’s what they designed them around and keeping this in mind I did what the old nineteen sixties ARRL Handbook recommended I am just using the output of the link tank with no loading coil directly, will try playing around with series capacity and see if there is anything that can be picked up that way but wanted to keep this simple with a minimum of modifications. I know most modify the transmitter for cathode keying but wanted to also keep all that original so installed on the rack panel is a high voltage relay that keys the HV on and off for keying the transmitter. Using a choke input filter and only 8 micro farads yelp is held to a minimum, also have a VR tube regulator on the oscillator feed that helps keep some form of load on the HV supply when not keyed to keep the capacitor of charging way up from the power supply being unloaded. Because big value capacitors are no longer a big deal everyone now days builds a lot of filter capacity in there HV supplies and think in some ways that adds to the problem of frequency stability when keyed but with this minimal filter find the transmitter keys just fine and has no detectable AM noise.

There is a lot you can do to make this a better transmitter, but in some ways just like using the old HRO receiver in its original configuration the challenge of doing things working within the confines of original design can be fun.

Have considered ditching coax entirely on this set up and running open wire to an end fed Hertz, at some point want to kick around the idea of a small shed or out building located away from the house, shop and all that with just Old School radios and an open wire feed system.

._,_