RACAL Handsets

#4867

Hi Guys,

Are there two different RACAL handset pinouts?
I have three RACAL handsets two of them dont work on a PRM4021 (only listen no key or TX voice)

The two that dont work are PN: 5965-99-901-4616
The one that works has no PN

Anyone know?

Ilan 4X6MU

Re: Need Adapter or Goose Neck for PRM-4021 series

#4866

I threaded mine for the AB-591 base, but it could be done for either.
John W8SDA

Re: Need Adapter or Goose Neck for PRM-4021 series

#4865

Hi John that would be swell thank you.
I would be interested in?2-3 units.?
Is the threading suitable for the AT-271 or the AB-591 Base?

Tnx & 73
Ilan 4X6MU

Re: Need Adapter or Goose Neck for PRM-4021 series

#4864

Ilan, as I mentioned the other day, I've previously machined an adapter for my BCC-66E that will allow the use of an AT-271 or similar NATO standard whip and spring base.? I just have to make more, I'll let you know when I have some available.
John W8SDA

Need Adapter or Goose Neck for PRM-4021 series

#4863

Hi Guys,

I am interested in a goose neck for the PRM4021 series or an adapter for AT-271
I heard there is a design for this.
Any help appreciated

Thanks Ilan 4X6MU

Re: PRM-4021 Whip antenna

#4862

开云体育

Mike,

yes, for rather less than that ?250 that Julian mentioned for a pukka whip, I suspect you could get a local machine company to make you up something? pretty fancy that will do the job!

And of course, the actual whippy bit - the copper sections with a draw cord are pretty common.?? I've got a load for the much earlier A40 and A41 manpacks - about 10' long.?? Of course they have the wrong base, and that's the bit that needs some thought.

Richard

On 21/06/2020 02:06, Mike Sanders wrote:

Show quoted text

Hi Richard,

In my general collection of stray bits and pieces I found a few sections of an ex-military sectional antenna made of copper plated steel. Two of these plug together to make a 2.5m whip and the bottom end of the larger section has a coarse thread molded onto it, which just happens to fit tightly into the whip socket on the radio, so I've decide to go with that initially as it's a quick and simple solution.

I'll look at making up a tilting base for the whip at a later date.

cheers,

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4861

Hi Richard,

In my general collection of stray bits and pieces I found a few sections of an ex-military sectional antenna made of copper plated steel. Two of these plug together to make a 2.5m whip and the bottom end of the larger section has a coarse thread molded onto it, which just happens to fit tightly into the whip socket on the radio, so I've decide to go with that initially as it's a quick and simple solution.

I'll look at making up a tilting base for the whip at a later date.

cheers,

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4860

开云体育

A replacement 2.4 metre whip antenna is available from Comrod in Norway.

This is nearly identical to the old Racal/Chelton/Cobham antenna.

The Comrod antenna is recommended by Thales as a replacement to the Racal unit.

As has been mentioned, the old Racal antenna tubular sections are steel, with a stainless steel cable holding it all together.

The Comrod antenna is identical, with the exception of having an elastic cord running through it, instead of a stainless steel cable.

The Comrod antenna is approximately ?250 for a one-off.

Julian Barnard.

Show quoted text

On 20 Jun 2020, at 11:38, Richard Hankins <g7rvi@...> wrote:

?
Mike,

surely the answer to this - the definitive answer - is in the manual that was recently posted in the Files area of this group???? Para 12.1 says

"This is a 2.4 metre whip antenna comprising eight sections with a stainless steel retaining cord and a flexible plug-in antenna mount......."

No mention of any loading coils, adjustments or anything else.? Pic of the same - Fig2.1 - confirms the same.

If you go to Part 4 of the manual which covers the ATU, we can see immediately that there is an "ATU inductor coil", which para 2.2 of that section says is a variable inductor - done by winding wire on and off a conducting metal drum.

I couldn't find a schematic of the ATU, but I think the above shows this set is absolutely standard military set design, which has an internal loading coil designed to tune any bit of wire/rod about 8' long.

So you don't need to build anything other than find a whip about 8' long which will mechanically fit the socket on the front of the set.? Then tune it!

best regards

Richard

G7RVI

On 20/06/2020 02:22, Mike Sanders wrote:

Thanks Peter & Richard for the information.

I was hoping that the answer would be no loading coil as that makes life much simpler. I do have another portable HF set that has a centre loaded whip with an adjustable loading coil so I wanted to confirm there was no similar arrangement on the 4021 before progressing the build.

Cheers,

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4859

开云体育

Mike,

surely the answer to this - the definitive answer - is in the manual that was recently posted in the Files area of this group???? Para 12.1 says

"This is a 2.4 metre whip antenna comprising eight sections with a stainless steel retaining cord and a flexible plug-in antenna mount......."

No mention of any loading coils, adjustments or anything else.? Pic of the same - Fig2.1 - confirms the same.

If you go to Part 4 of the manual which covers the ATU, we can see immediately that there is an "ATU inductor coil", which para 2.2 of that section says is a variable inductor - done by winding wire on and off a conducting metal drum.

I couldn't find a schematic of the ATU, but I think the above shows this set is absolutely standard military set design, which has an internal loading coil designed to tune any bit of wire/rod about 8' long.

So you don't need to build anything other than find a whip about 8' long which will mechanically fit the socket on the front of the set.? Then tune it!

best regards

Richard

G7RVI

On 20/06/2020 02:22, Mike Sanders wrote:

Show quoted text

Thanks Peter & Richard for the information.

I was hoping that the answer would be no loading coil as that makes life much simpler. I do have another portable HF set that has a centre loaded whip with an adjustable loading coil so I wanted to confirm there was no similar arrangement on the 4021 before progressing the build.

Cheers,

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4858

Thanks Peter & Richard for the information.

I was hoping that the answer would be no loading coil as that makes life much simpler. I do have another portable HF set that has a centre loaded whip with an adjustable loading coil so I wanted to confirm there was no similar arrangement on the 4021 before progressing the build.

Cheers,

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4857

Pye used to make things for civil defence league Aswell?

On Friday, 19 June 2020, 10:35:38 BST, Andy <andy@...> wrote:

Hello Richard
???????? I have a Pye Compac 8 HF TRX. These have a very peculiar antenna tuner, which is in fact a form of variometer built into the antenna base. The PRC76 did the same sort of thing. But as you say, not the norm!

Re: PRM-4021 Whip antenna

#4856

开云体育

I too have a PRM4021 and have used it with external loading coils noted in another email.

A Ham Stick for example is as effective as the standard long whip and is much easier to carry and move around.Yes, it is band specific, but they work just fine with the internal tuner . Just put on whatever you pick and tune it by the LEDs.

KA1GON

Sent from my Verizon, Samsung Galaxy smartphone

Show quoted text

-------- Original message --------

From: Mike Sanders <mikegsanders@...>

Date: 6/18/20 7:14 PM (GMT-05:00)

To: [email protected]

Subject: [RacalRadio] PRM-4021 Whip antenna

Hi,

I have a working example of a PRM-4021 (radio only) that I would like to use with a whip antenna.

I know from the manual that the factory whip is 2.4 metres long, but what I haven't been able to work out is if there is any loading coil at the base of the whip. I am confident I can build a suitable whip and machine the required plug to fit the socket on the radio, but I would be grateful if anyone who has the factory whip for one of these radios could have a look and let me know if there is a loading coil and, if it can be seen, the number of turns and diameter of the coil - if anyone is in a position to actually measure its inductance that would be a major bonus.

Thanks in anticipation.

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4855

开云体育

There are a number of workable adjustable loading coils available. Manufacturers fitted them to specific radios such as the PRC 74 among others.

One should not forget adapting High Gain specific band and Hamstick specific band coils. The last two work very well.

There is an American Ham coil with taps and a number of slide adjustable coils that can be adapted. In short, all you have to do is try one or more and pick what you like.

Charles KA1GON

Sent from my Verizon, Samsung Galaxy smartphone

Show quoted text

-------- Original message --------

From: Richard Hankins <g7rvi@...>

Date: 6/19/20 5:22 AM (GMT-05:00)

To: [email protected]

Subject: Re: [RacalRadio] PRM-4021 Whip antenna

Mike,

"a loading coil" would be a near impossibility on a radio designed to cover a wide range of frequencies.?? Loading coils have to be adjusted for a very specific - single - frequency, so any "loading coil" would need to be highly adjustable.??? I've never seen any whip with such an adjustable inductor built in.???? Of course, nearly all military sets have a variable inductor internally to do just the job you are describing - tune the whip to resonance.?? I expect the PRM-4021 is just like all the rest!

Richard

G7RVI

On 19/06/2020 00:14, Mike Sanders wrote:

Hi,

I have a working example of a PRM-4021 (radio only) that I would like to use with a whip antenna.

I know from the manual that the factory whip is 2.4 metres long, but what I haven't been able to work out is if there is any loading coil at the base of the whip. I am confident I can build a suitable whip and machine the required plug to fit the socket on the radio, but I would be grateful if anyone who has the factory whip for one of these radios could have a look and let me know if there is a loading coil and, if it can be seen, the number of turns and diameter of the coil - if anyone is in a position to actually measure its inductance that would be a major bonus.

Thanks in anticipation.

Mike, ZL2MGS.

Re: FS: RACAL Gear

#4854

开云体育

Hi All,

?

Does anyone have a battery pack, or clip on power amplifier for my PRM 4031, for sale ?

?

I can be contacted on Mobile 07788 417 300 or Email? peter@...

?

Many thanks

?

Peter (G8CDC)

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Ilan via groups.io
Sent: 19 June 2020 14:08
To: [email protected]
Subject: [RacalRadio] FS: RACAL Gear

?

Hi ,

I Have for sale the following Pieces of RACAL gear:
1) PRM-4021 HF MANPACK Radio?Very Good Condition Fully Tested
2) TA-940B 100W 2-30MHz HF Amplifier for Syncal-30?Good Condition Fully Tested
3) MA-945B Battery Charger very Good Good Condition Fully Tested
4) Goose-Neck Antenna adapter for SYNCAL-30 NOS Condition never used
5) Battery Box for SYNCAL-30 Needs New Cells

Please Contact Me directly for prices and pictures
email: galiaf1@...
+972-54-313-6944

Regards 73s
Ilan Yacobi 4X6MU
Israel

FS: RACAL Gear

#4853

Hi ,

I Have for sale the following Pieces of RACAL gear:
1) PRM-4021 HF MANPACK Radio?Very Good Condition Fully Tested
2) TA-940B 100W 2-30MHz HF Amplifier for Syncal-30?Good Condition Fully Tested
3) MA-945B Battery Charger very Good Good Condition Fully Tested
4) Goose-Neck Antenna adapter for SYNCAL-30 NOS Condition never used
5) Battery Box for SYNCAL-30 Needs New Cells

Please Contact Me directly for prices and pictures
email: galiaf1@...
+972-54-313-6944

Regards 73s
Ilan Yacobi 4X6MU
Israel

Re: PRM-4021 Whip antenna

#4852

Hello Richard
???????? I have a Pye Compac 8 HF TRX. These have a very peculiar antenna tuner, which is in fact a form of variometer built into the antenna base. The PRC76 did the same sort of thing. But as you say, not the norm!

Re: PRM-4021 Whip antenna

#4851

开云体育

Mike,

"a loading coil" would be a near impossibility on a radio designed to cover a wide range of frequencies.?? Loading coils have to be adjusted for a very specific - single - frequency, so any "loading coil" would need to be highly adjustable.??? I've never seen any whip with such an adjustable inductor built in.???? Of course, nearly all military sets have a variable inductor internally to do just the job you are describing - tune the whip to resonance.?? I expect the PRM-4021 is just like all the rest!

Richard

G7RVI

On 19/06/2020 00:14, Mike Sanders wrote:

Show quoted text

Hi,

I have a working example of a PRM-4021 (radio only) that I would like to use with a whip antenna.

I know from the manual that the factory whip is 2.4 metres long, but what I haven't been able to work out is if there is any loading coil at the base of the whip. I am confident I can build a suitable whip and machine the required plug to fit the socket on the radio, but I would be grateful if anyone who has the factory whip for one of these radios could have a look and let me know if there is a loading coil and, if it can be seen, the number of turns and diameter of the coil - if anyone is in a position to actually measure its inductance that would be a major bonus.

Thanks in anticipation.

Mike, ZL2MGS.

Re: PRM-4021 Whip antenna

#4850

Hi Mike,

No, there is no loading coil at the base of the HF whip. Its a straight through connected sectional whip with a semi-flexible "gooseneck" at the base to allow some angular adjustment. Matching for the whip is done by the ATU inside the radio.

Good luck with the build!

?

Peter
G4DJB

PRM-4021 Whip antenna

#4849

Hi,

I have a working example of a PRM-4021 (radio only) that I would like to use with a whip antenna.

I know from the manual that the factory whip is 2.4 metres long, but what I haven't been able to work out is if there is any loading coil at the base of the whip. I am confident I can build a suitable whip and machine the required plug to fit the socket on the radio, but I would be grateful if anyone who has the factory whip for one of these radios could have a look and let me know if there is a loading coil and, if it can be seen, the number of turns and diameter of the coil - if anyone is in a position to actually measure its inductance that would be a major bonus.

Thanks in anticipation.

Mike, ZL2MGS.

Re: TRA976 MA991 layout drawing

#4848

Thank you both for the help. With luck I can now find this silly fault.

?????????????????????????????????????????????????????????????????????????????????????????? Thanks Andy