Hammarlund Four-20 and Four-11 Transmiiter

[wa2pjp]

Hi All,

I recently purchased a very nice Hammarlund Four 20 and Four-11 transmitter-modulator combination in very nice shape , but it is missing the tank coils. Does any one know which coils where used or does any one have a set of 80/40 meter coils I could purchase, or the drawings in which case I could make my own. My manual doesn't give much detail on these.
Thanks and 73's,
Joe

[WQ9E]

Joe,

I have this pair along with most/all of the coils.  I will take some photos and provide info over the weekend if nobody else provides it first.

[wa2pjp]

Hi Rodger, thanks very much I would really appreciate that as I would like to put this rig on the air and hopefully find a nice clean HQ-129 to go alone with it.

[Don, W2DL]

Hello Joe,  check your PM on this BB for my comment 

Don, W2DL

[WQ9E]

Hi Joe,

Sorry not to get back to you sooner but a bunch of unexpected tasks showed up this weekend including a racing pigeon who decided to hang out for a couple of days  

I pulled my 4-20/4-11 setup and documentation to confirm my memories were correct.  Mine came with B&W "junior" coils for the 4 bands it covers and the only modification to the coils is an added lead to allow selection of how many turns of the output coupling coil are used to provide coupling control.  They all work fine so I would suggest you consider this route.  I remember searching the web when I got mine a couple of years ago and the only photo I could find of a supposed Hammarlund original coil looked just like the B&W coils with the added clip lead.

Jim Hanlon wrote an excellent article about the Hammarlund pair in March 1997 Electric Radio which you will find helpful if you haven't run across it already.