Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

donate to eham
   Home   Help Search  
Pages: Prev 1 [2] 3 Next   Go Down
  Print  
Author Topic: Got a Harvey-Wells TBS-50C/D  (Read 23671 times)
KE0ZU
Member

Posts: 462


WWW

Ignore
« Reply #15 on: December 14, 2015, 05:47:03 AM »

Thought I'd update this thread.   About a month ago I finally got this transmitter running, and teamed it up with a Viking 122 VFO and Hallicrafters S38C.   I reconstructed the modulator and replaced a few resistors and caps in the RF chain as well.  I did have to make one modification though, add a 3.75 meg tank in the oscillator plate circuit because the Viking VFO's output on 160 and 80 was 1.8 megs, and the HW wanted to see 3.75 MC for both bands, at the oscillator's output.   On 40M the VFO's output jumped to 7 megacycles which is compatible with the Harvey Wells.

It took a few days to get the cables made and the rest of the bugs worked out.   One strange thing In encountered was that a brass tuning slug in one of the multiplier coils came un-screwed from the #6 threaded adjuster, so it wouldn't tune on 20M.  



Here is the "new" station I used on the 80M AM net about the first of November.





Its been a fun little project and the guys say it sounds good on the air so I'm happy.   There's not much kumzoutta on ten meters, but that old national amp setting to the left of it, on the bench will turn that into a hundred or so.   That'll be enough.

« Last Edit: February 05, 2016, 06:07:18 AM by KE0ZU » Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
G3RZP
Member

Posts: 1280




Ignore
« Reply #16 on: December 14, 2015, 09:00:31 AM »

As a matter of interest, how much output do you get on 2 metres?
Logged
KE0ZU
Member

Posts: 462


WWW

Ignore
« Reply #17 on: December 15, 2015, 01:00:45 PM »

Quote
As a matter of interest, how much output do you get on 2 metres?
Haven't tried it on two meters, or 6 for that matter, I need either crystals or some other signal source in the proper frequency range with sufficient output.    Noting the 21 and 30MC output levels on the chart, trending south at a fairly significant rate, I'd suspect a watt would be an optimistic guess.
Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
KB4QAA
Member

Posts: 3339




Ignore
« Reply #18 on: December 15, 2015, 01:29:22 PM »

Congrats on getting the TBS-50 working.  They were the IC-706's of their day!

Great looking lab you have!!! You can be proud of that as well.  73, bill
Logged

KA0HCP, ex-KB4QAA Relocated to Ks. April 2019.
WA8UEG
Member

Posts: 810




Ignore
« Reply #19 on: December 15, 2015, 06:04:04 PM »

       Mine puts out 30 watts on 6 CW. Have not used it on 2.

Logged
KE0ZU
Member

Posts: 462


WWW

Ignore
« Reply #20 on: December 16, 2015, 05:41:59 AM »

Quote
Mine puts out 30 watts on 6 CW. Have not used it on 2.
Thats very significant, how much B+ are you using?  Are you using crystals?   I'm running the recommended 400V, but I know the 807 will handle much more.

Quote
Great looking lab you have!!! You can be proud of that as well.  73, bill
Thanks for your comment Bill, its just another facet of the hobby and took a few years to accumulate and BUILD, but it makes the repair/refurbish projects a lot more enjoyable.  
« Last Edit: December 18, 2015, 06:25:30 AM by KE0ZU » Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
KM1H
Member

Posts: 5281




Ignore
« Reply #21 on: December 16, 2015, 03:05:14 PM »

I had to add a bandpass filter to my D to get an accurate 6M reading of about 18W, talk about harmonics and spurs! And the plate had some color at 500V on 6 but not lower. Never tried 2 but several have said 1-2W.

In the late 50's I ran one mobile on 10 and 20 with about 425V off a dynamotor. Worked crazy well on 10 when I drove to one of the ocean towns on LI and parked at the beach. Talk about signal enhancement!
OTOH it was sure a drain on a 6V battery and 25A generator in a 49 Ford when anything else was turned on and I didnt dare use it at night.

Carl
Logged
WA8UEG
Member

Posts: 810




Ignore
« Reply #22 on: December 16, 2015, 04:06:27 PM »

Quote
Mine puts out 30 watts on 6 CW. Have not used it on 2.
Thats very significant, how much B+ are you using?  Are you using crystals?

I'm running the recommended 400V, but I know the 807 will handle much more.

450V and running crystals. I'm looking for the VFO but no success so far. I might convert a HG10 if I can't find one but since it's a fun project i'm in no hurry, I just completed the power supply a few weeks ago.
 
I will use it with either my HQ129X or my HQ140 both of which are on the bench getting all new caps and resistors and I will need to add a converter. I have only made 3 contacts with it all on 6 CW. I used my FT5000MP as the receiver..........that aint right Smiley
Logged
G3RZP
Member

Posts: 1280




Ignore
« Reply #23 on: December 17, 2015, 12:47:36 AM »

My father told me that there was a tube called an 8018, which was an 807 selection for full power at 120 Mc/s: he did have one, but it had gone when I went through the tube stock after he became SK. He said it was a special selection for an RAF transmitter that actually became an aborted project in favour of the SCR522.

It would be interesting to see if one of those could make a TBS-50 give more output up there.....
Logged
W1BR
Member

Posts: 4189




Ignore
« Reply #24 on: December 17, 2015, 08:22:41 AM »

I had to add a bandpass filter to my D to get an accurate 6M reading of about 18W, talk about harmonics and spurs! And the plate had some color at 500V on 6 but not lower. Never tried 2 but several have said 1-2W.
 

Carl

I agree with Carl.  Many wattmeters have increasing sensitivity as frequency increases.  The presence of any harmonics and/or parasitic energy will greatly affect the power readings.  18 watts on six meters would be generous for that design. 

Pete
Logged
KM1H
Member

Posts: 5281




Ignore
« Reply #25 on: December 17, 2015, 05:33:06 PM »

That 18W was with new or as new tubes and a 807W/5933 in the final. The meter was the old Bird 43 with a 10W element, and a 3dB 20W Narda pad so the accuracy should be fairly decent, I havent calibrated either in ages.

The filter was an old Waters that I have to use on the ouput of the regular station 6M transverter (a boatanchor in its own right, a modified Hallicrafters HA-6 that drives a NCL-2006) otherwise all the local 2 way FM RF pollution from a site across the street and about 2 miles LOS with a lot more signals including FM and VHF plus UHF TV. The crud goes away 100% and I can hear a pin drop in EU when the band is open.

Carl
Logged
N3QE
Member

Posts: 5587




Ignore
« Reply #26 on: December 18, 2015, 11:02:36 AM »

And here I was, thinking that rigs combining HF + VHF in one package were a "new thing" :-).
Logged
W7APM
Member

Posts: 60




Ignore
« Reply #27 on: February 02, 2016, 02:29:51 PM »

I bought the power supply for one at an estate sale a while back and the transmitter became available locally here on Ebay a short while later. I have worked over the transmitter now and it works very well and is in very nice cosmetic shape too. What is the difference between those with and without the Microphone amplifier?
Logged
KM1H
Member

Posts: 5281




Ignore
« Reply #28 on: February 02, 2016, 07:48:13 PM »

50B CW only; 50C carbon mike, 50D crystal or high impedance dynamic mike.

Carl
Logged
W7APM
Member

Posts: 60




Ignore
« Reply #29 on: February 03, 2016, 12:10:18 PM »

Thanks Carl, Mine works OK with a High Impedance Dynamic but even better with a Un-amplified D-104
Logged
Pages: Prev 1 [2] 3 Next   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!