[Milsurplus] Regen receivers in 2 way traffic

[JOHN MCCARTY]

  I have used the Jones #19 tube RX in two way amateur work for a goodly number of contacts. I started off turningoff the B+ when transmitting with my #19 tube transmitter. The transmitter is a bread board copy of "The Last Ditcher"from QST. It seemed that the RX came right back up on frequency. But after awhile I figured out that it was just aseasy to unseat the headphone plug and let the detector take the hit. It recovered instantly. I found that dependingon how I coupled the antenna to the TX I didn't need a RX/TX switch. I just arranged the set up so the RX coil wasclose to the antenna tuning tank and the coupling between the two was good enough that the level was not badlyimpacted. In that configuration with key up you could hear a small signal when you tuned across the XTAL frequency.As far as spotting goes I made up a small XTAL oscillator using no tuned circuits which puts out a weak signal. Iguess it could also be used as an XTAL tester if I gave it an output meter.
Back in the day I don't think frequency spotting for rock bound novices was as important as it is today.
I agree with what Hue said about super regens.

73

John n9hrt

    On Saturday, January 9, 2021, 4:21:27 PM CST, Hubert Miller <kargo_cult at msn.com> wrote:  
 
 I would like to know more about the TBX net thing. I have only used the TBX on receive, but I want to put one on the 
air, but this will be after I downsize and relocate, which is THE major project.

This makes me think of the Chinese type 81 transmitter - receiver, which I have heard, has a net problem like this also.
As in, "impossible to net". 

The 'Novice Pair' is from the late 1950s and has an 80 meters, single 6BQ6 transmitter at about 30 watts. I think the ham
literature recommended 80 to novices because it was easier to get marginal equipment working there, and also the lesser
range kept the novices out of other hams' way. The receiver is 2x 6AQ5. Stability was 'sort of' obtained by using a high-C
tuned circuit. I don't care for 80m at all and will rework the transmitter to 40M. So I was wondering if I turn off the receiver
B+, would it come back up, right on the same frequency. For many years I thought using a 6AQ5 as the regen detector was
insane, as the draw for the 2 tubes is 50 mA at 250 volts. But ARRL text explains that this tube actually works better as 
regen detector than the commonly thought of tubes. There is NO spot facility. It's all-on or all off. I don't recall that the 
article talks much about t/r switching. They do say you can use 2 different antennas. Otherwise, as I see it, you need 
a switch for the transmitter, switch for receiver, and antenna switch. Then you can proudly state on-air, "Switching here
is fully manual, OM !"

Some replies mentioned transceivers that are SUPERregenerative circuit. Before you cite such equipment, think of the 
characteristics of the superregen receiver.
-Hue Miller 


>The blocking issue that Howie brings up with RAL is similar to the pulling issue with TBX if you try to "net" the receiver to the transmitter or vice versa.  The best cure I have found has been to pass the frequency from one to the other with an LM heterodyne frequency meter. 

That might help in Hue's problem.  I wonder what the original intent was with the "Novice Pair" setup he was referring to.  Did the transmitter have a low-level output mode like "spot" ?

RF
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