¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. RacalRadio
  2. Messages
Expanded Topics Messages Polls
Date
Re: TRA931 - transmitter PA transistors 2N5070

 

Dennis
MRF-401? You say these are good final transistors for my 921? ok..i will try to find them.. are they readily available??My radio uses a matched set? It would be the answer to a prayer! I will hunt them down unless you hae a source already.
thanks dave
KG4LQT


--- On Fri, 4/9/10, david ludlow wrote:

From: david ludlow
Subject: Re: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070
To: Racal-manpacks@...
Date: Friday, April 9, 2010, 2:42 PM

?
hi dennis..
Are the transistors your looking for the finals transistors? If you have ant luck please let me know too.? I have a racal 921 and need a source for good finals too.? i have sent out several emails to no luck.? Im using some commercial transmitter finals now aN elmer put in ?but im pretty dissatisfied.?
good luck To you
dave
KG4LQT

--- On Thu, 4/8/10, Dennis wrote:

From: Dennis
Subject: Re: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070
To: Racal-manpacks@ yahoogroups. com
Date: Thursday, April 8, 2010, 12:01 PM

?
Use MRF-401. It will actually work a little better than the originals.

Available from:

?
Dennis Starks
Military-Radio- Guy
KB0SFP
Monitor(all USB):
3996, 5403.5, 7296, 14342.5, 18157.5


From: Peter
To: Racal-manpacks@ yahoogroups. com
Sent: Thu, April 8, 2010 8:44:48 AM
Subject: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070

?
Hello all,

does someone know where to get a (matched) pair of the 2N5070 (Racal No. 711356) or a substitute, please?

Thank you and
73s,
Peter, DC6BN
Re: TRA931 - transmitter PA transistors 2N5070

 


?

Are the transistors your looking for the finals transistors?
----------------
Yes. the 2N5070 are the RF/PA trans used in the Racal Syncal 30(TRA931) & others.


?If you have ant luck please let me know too.
----------------
I thought I did.
The MRF-401 though bot exactly the same package as the 2n5070 it can easily be fit in the space provided & it works very well.
Again, they can be purchased very reasonably in matched pairs from:


?
Dennis Starks
Military-Radio- Guy
KB0SFP
Monitor(all USB):
3996, 5403.5, 7296, 14342.5, 18157.5




Re: TRA931 - transmitter PA transistors 2N5070

 

hi dennis..
Are the transistors your looking for the finals transistors? If you have ant luck please let me know too.? I have a racal 921 and need a source for good finals too.? i have sent out several emails to no luck.? Im using some commercial transmitter finals now aN elmer put in ?but im pretty dissatisfied.?
good luck To you
dave
KG4LQT


--- On Thu, 4/8/10, Dennis wrote:

From: Dennis
Subject: Re: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070
To: Racal-manpacks@...
Date: Thursday, April 8, 2010, 12:01 PM

?
Use MRF-401. It will actually work a little better than the originals.

Available from:

?
Dennis Starks
Military-Radio- Guy
KB0SFP
Monitor(all USB):
3996, 5403.5, 7296, 14342.5, 18157.5


From: Peter
To: Racal-manpacks@ yahoogroups. com
Sent: Thu, April 8, 2010 8:44:48 AM
Subject: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070

?
Hello all,

does someone know where to get a (matched) pair of the 2N5070 (Racal No. 711356) or a substitute, please?

Thank you and
73s,
Peter, DC6BN
Re: TRA931 - transmitter PA transistors 2N5070

 

?
Many thanks, Dennis, will do.
Best rgds.,
Peter, DC6BN
Re: TRA931 - transmitter PA transistors 2N5070

 

Use MRF-401. It will actually work a little better than the originals.

Available from:

?
Dennis Starks
Military-Radio-Guy
KB0SFP
Monitor(all USB):
3996, 5403.5, 7296, 14342.5, 18157.5


From: Peter
To: Racal-manpacks@...
Sent: Thu, April 8, 2010 8:44:48 AM
Subject: [Racal-manpacks] TRA931 - transmitter PA transistors 2N5070

?

Hello all,

does someone know where to get a (matched) pair of the 2N5070 (Racal No. 711356) or a substitute, please?

Thank you and
73s,
Peter, DC6BN
TRA931 - transmitter PA transistors 2N5070

 

Hello all,

does someone know where to get a (matched) pair of the 2N5070 (Racal No. 711356) or a substitute, please?

Thank you and
73s,
Peter, DC6BN
Norfolk radio amateur could make world record

 

Release of book "Milspec radio equipment, Vol2"

 

931 Power Switch?

peter
 

Hi,

Does anyone have a power switch for a 931P? This is the 3-position rotary switch (Off, Low Power, High Power). A friend has a radio with this switch missing and is looking for one.

Any help/info appreciated,

Thanks,

Peter
Re: Yeoman Racal TRA 3910

 

¿ªÔÆÌåÓý

In a message dated 08/04/2010 12:11:42 GMT Daylight Time, martin-smyth@... writes:
?

Hello,

Does anyone have any User manuals or notes on the Yeoman Racal TRA 3910 please.

Regards,

Martin
M0MGA

Martin
?
You will probably get a negative answer on this one, as most were produced as trials kit at Racal Salisbury, so I am lead to believe, and even the guys formerly at Racal Reading and subsequently at Thales Crawley, have no knowledge of any instruction/maintenance manuals for the 3900 series of radios (VHF and HF), this of course Racal's offering for the Bowman contract?? The offering was called Yeoman.
?
I wish you luck, the only hope we have is to track down the original designer/design team, they may still have notes, those on hear who are Ex Racal please get back to us, you know who you are, reply direct if you don't wish to go public, hope all is well in Marlow!
?

This from Pre Bowman days, clipped from the web:

In the UK, Racal is bidding with Siemens Plessey Systems as the Yeoman team for the British Army's next generation communications requirements. Project BOWMAN will provide a state-of-the-art voice and data network with encrypted, ruggedised and electronic warfare-resistant communications. Racal will provide all VHF/HF radio communications for Bowman, based on the Jaguar, which is the world's most widely used tactical radio, and developed from its second generation radio, Panther. Siemens Plessey Systems will be responsible for the management information systems and overall system design.

?
?
?
Cheers
?
Stuart
G0TBI
?
BTW I am still looking for a TA 4793 Amp, one guy came back to me a few weeks ago, and then nothing afterwards!!!
Yeoman Racal TRA 3910

 

Hello,

Does anyone have any User manuals or notes on the Yeoman Racal TRA 3910 please.

Regards,

Martin
M0MGA
Clansman bits for sale

martin
 

Hi all please see my clansman bits on ebay






G7JWR
G7jwr@...
Re: TRA 921 clarifier

 

¿ªÔÆÌåÓý

Pete:
?
I have modified two TRA-921's to work on 60M.? This is not a clarifier, but it is very simple to do.? The MHz knob on the radio selects a crystal oscillator for each 1 MHz band from 2 to 7 MHz.? The PLL synthesizer does the 100 KHz, 10 KHz and 1 KHz selection.? I simply found the crystal for the 5 MHz band and put a 12 pf capacitor in parallel with it.? You may have to "tweak" this value a bit to get it just right.? I did this by selecting the capacitor from several on hand.? This offsets the entire 5 MHz band down 500 Hz, but it will take you less than 15 minutes to put the mod in the radio.? This mod?will require you to tune to the next higher 1 KHz position on the dial, while on 60M.
?
I thought about replacing the desiccator with a pot and put a?varicap diode?on the reference oscillator,?but I have not got around to it yet.? This would reduce the frequency stability a bit.? It is very good now.
?
This radio also have very good true AM modulation and?a true AM detector along with a good AM IF filter.??For those who?check into any of the military?radio AM nets, it is?better than most packsets.
?
Good luck,
?
Jim Butch
wb8cdx
?
?
TR-38D transceiver service manual

 

Hi group:

I would like some help to find schematics or service manual for old transceiver? Racal TR-38D. I think it was manufactured in South Africa ! Thanks a lot.

??????????????????????????????? From Roland, a real Racal lover.
TRA 921 clarifier

g1inf
 

Hello, folks,

Has anyone any experience with fitting a clarifier (tx and rx) to the synth on a TRA 921?

I've acquired a couple of these radios, and one of the applications I intend for one of them has frequency allocations at xxxx.5 kHz.

I'm guessing I need to pull the reference osc crystal, but I'd rather get sound advice before plunging in.

Best regards,

Pete.
Clansman prc320 test kit

martin
 

Hi all i have a clansman prc-320 test set on ebay, item number 290416942496 it consists of the test equipment for testing the moduals and also a very nice jig for holding the radio when out of the casing,
very nice piece of kit



Martin G7JWR
Re: Comcal 30

 

¿ªÔÆÌåÓý

In a message dated 29/03/2010 04:48:13 GMT Daylight Time, gerald@... writes:
I have a Comcal 30 on ebay 130378476230
73 de Gerald
----------------------
?
when you say " in working order (as far as I can tell)?"
?
what does that mean ?
?
Does it receive? does it transmit ?
?
What's been 'tested' ?
?
BN
Comcal 30

Gerald
 

I have a Comcal 30 on ebay 130378476230
73 de Gerald
Re: clansman UK/prc-320 manpacks for sale

 

hi martin? how much are you asking for one of these?? Do they work well and are the finals good and all the other components?I got burned on my last purchase not willing to be burned again!tell me someting about them.
dave kg4lqt


--- On Fri, 3/12/10, martin wrote:

From: martin
Subject: [Racal-manpacks] clansman UK/prc-320 manpacks for sale
To: Racal-manpacks@...
Date: Friday, March 12, 2010, 5:56 PM

?
I have two prc-320 for sale left in my current batch, both are fully working and
ready to use on HF 2-30mhz ssb,am and cw.

I can also supply as a complete package if required.

1x rt320 radio tested
1x whip antenna
1x antenna goose kneck
1x heavy duty battery charged and tested
1x headset/mike

I will ship worldwide and paypal accepted

please email directly and not via the forum at


i may consider px
Racal Information

 

In my last post it should read BCC567HD

Regards
Dave g1jwg
5201 - 5220 of 6864