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Re: PRC320 and dipole?
This is all basically correct: in military use, (back in the days of predictable, known frequencies for a particular job), a dipole would be pre-adjusted to work a distant station, and would be used on the BNC output before the ATU.? This used to work, with whatever power the 320 allowed up the antenna, which probably was'nt a lot, overall.
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Where the antenna was going to be less than ideal, or lower than it should be, it could then be rigged across the ATU output, as described, and some sort of peak achieved.?
?
Although not part of the CES, there used to be locally made up 39pF, and 100pF HV "door-knob" capacitors, with well insulated croc-clips either end.? These were not specifically to improve the matching (although they got used for that purpose), but were intended for coupling the 320 into unknown lengths of wire, such as fences, telephone and power lines, operationally, as a field expedient means of getting a good length of wire up in the air and achieving fairly discreet sky-wave.
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There was a more professional looking gadget with the 319 CES (possibly made in local workshops, or adapted from foreign kit), which had a similar hefty HV door-knob capacitor, but was mounted on a ground-spike, and had a choke shunting the antenna to ground, in DC terms.? This had a really hefty croc-clip on the output, similar to that found on car jump-leads, which allowed connection to disconnected lightning conductors, and quite large diameter pipes, etc.
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This was for operational "field expedient" use only, and a very long way from Elf and Safety, but would be in places where it was know that there was no power anywhere, just dead wiring (if it had'nt been removed and sold by locals!)
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73
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Al
G8LIT/W4
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? From: "Military1944@..." To: Racal-manpacks@... Sent: Thu, September 23, 2010 3:51:48 AM Subject: Re: [Racal-manpacks] PRC320 and dipole? ?
In a message dated 22/09/2010 19:58:42 GMT Daylight Time, iain@... writes:
Feeding the dipole with coax from the transmitter output BNC is the correct : The trouble there Iain is that there no way of knowing the match as the metering is not in circuit,the manual states using the BNC and I guess they (the mil) must have just accepted the slight mismatch etc, after all, even a diploe cut for say 14.200 will be off at 14.250 so I think we just need to accept it.
There was a thread on the clansman_larkspur group a : Thats interesting as the mnual makes no mention of adding a cap, and none is carried in the kit, unlike the Ws19 cap unit.
?
Anyway, out portable next week, will have a play, hi.
?
cheers, Ben.
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Re: Syncal 30 / TRA 931
ektpuah
John,
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Thanks for the good suggestion. I bought the Tamiya Nato Green spray paint and it is indeed a very close match to the original. Now, apart from the frequency knobs, my radio looks almost like new : ) Best regards James Puah 9V1JP Ps: Serious QSO are carried out in prone position : ) --- In Racal-manpacks@..., "John" <wombat5@...> wrote:
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Re: Looking for Syncal 30 frequency knobs
开云体育James,The nut should be slotted for a screwdriver.? The Syncal 30 has 5 frequency knobs and a search knob for a total of 6.? Tom On 9/26/2010 10:17 AM, James Puah wrote:
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Re: Looking for Syncal 30 frequency knobs
James Puah
开云体育Dear Tom, Thanks for the advise on how the knobs are held onto the shaft.? I pry open the covering cap and found the nut holding on the knob.? But I cannot see how one can put a spanner over the nut to loosen them (4 in total?).? Hope you can please help me with some instructions. Many thanks and best regards James Puah 9V1JP Ps.:? Serious QSOs are done in prone position : ) ? |
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On ebay rare and hard to find items
MJB
开云体育Hi John,I always feel that if we are members of a group, we should offer that group the best deal on anything we have for sale. Granted anybody would want to get a reasonable price for things, but is not advertising what we have put on ebay, outside the spirit if not the letter of the group? If members want to use ebay, then that is their choice, but I feel that, if they do this, then they should not use ANY group they belong to to advertise that? Do you have any comments or do other group members feel the same or differently? Oh! I see it as quite a different thing if somebody sees something they feel the group would want to know about, and possibly bid on, not their own item of course, then draw that to the attention of the group with the ebay link, so it can be directly accessed.? Just saying something is on ebay, when you have done all the work to find it, is also not as helpful as passing on the direct link; well in my view it isnt! Cheers Mike m1ccf On 25/09/2010 23:00, johnigg wrote: ? |
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Re: FA:On ebay rare and hard to find items
开云体育Sent from my HTC Touch Pro2 on the Now Network from Sprint3?. -----Original Meewzfv weessage----- From: johnigg
Sent: Saturday, September 25, 2010 4:00 PM To: Racal-manpacks@... Subject: [Racal-manpacks] FA:On ebay rare and hard to find items [The entire original message is not included] |
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Re: Looking for Syncal 30 frequency knobs
To remove the knobs, take off the cover over the knobs. There are 4 screws holding it on. Then pry the cap off the end of the knob and loosen the nut. Then just pull the knob off the shaft.
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Tom Bryan N3AJA On 9/25/2010 6:59 AM, ektpuah wrote:
Hi, |
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Re: Looking for Syncal 30 frequency knobs
Hi?James and all!
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To remove the?frequency decade?knobs:
With the help of a dull knife remove carefully?the?KNOBS COVER. underneath the screw that will prent the knob.
Just remove it an voila!...
?
I own a few?parts and components?of Racal Syncal 30, includind?knobs you need.
I believe that mail will?be to very?high for his address,?anyway contact me in private mail!
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See you soon!
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73 QRO from PY1AFG - Ton
Rio de Janeiro?- Brasil
(military?equipment collector)?
========================
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From: ektpuah To: Racal-manpacks@... Sent: Sat, September 25, 2010 7:59:38 AM Subject: [Racal-manpacks] Looking for Syncal 30 frequency knobs ? Hi, |
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Racal antennas
I've added images to the "Photos" section of catalogue images for the RA.961 Tactical Magnetic Loop, and the HC 30-76 Tactical Helicone antennas.
I haven't had chance yet to edit the images, so included on the pages you're also getting the catalogue entries for the RA.911 Parachutist's Sloping Vee, the MA.797 HF Inverted "L" / Long Wire, the RA.951 VHF/UHF Log Periodic, and the RA.977 Log Periodic (if anyone has an RA.977 I'd be interested in buying). I'll scan and add other pages as I get chance. regards, Bob |
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Re: PRC320 and dipole?
Gerald Greatrix
开云体育When you take disconnect the BNC jumper the 320 ATU will not work on a dipole (dipole needs to be cut to length ) 73 ? From:
Racal-manpacks@... [mailto:Racal-manpacks@...] On
Behalf Of Military1944@... ? ? In a message dated 22/09/2010 19:58:42 GMT Daylight Time,
iain@... writes:
: The trouble there Iain is that there no way of knowing the match as the metering is not in circuit,the manual states using the BNC and I guess they (the mil) must have just accepted the slight mismatch etc, after all, even a diploe cut for say 14.200 will be off at 14.250 so I think we just need to accept it.
: Thats interesting as the mnual makes no mention of adding a cap, and none is carried in the kit, unlike the Ws19 cap unit. ? Anyway, out portable next week, will have a play, hi. ? cheers, Ben. ?
No virus
found in this incoming message. |
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Re: PRC320 and dipole?
开云体育In a message dated 23/09/2010 14:43:15 GMT Daylight Time,
hb9ibz@... writes:
Hi Ben, --------------------------
?
Yes JC, have been trying my 320 via the rf o/p BNC on the rear
today on 20 and 80Mtrs. All seems fine so I think for future portable ops I'll
be using this option into a cut dipole etc.
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cheers, Ben G4BXD |
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Re: PRC320 and dipole?
Ben.
As we (I) said earlier this was an amateurs bodge, not official teaching In reality the 320 does tolerate a substantial mismatch, although there is no way of know what the output is under such circumstances, in service terms. It automatically turns down the output to carry a mismatch Mike -----Original Message-----
From: Military1944@... To: Racal-manpacks@... Sent: Thu, 23 Sep 2010 9:13 Subject: Re: [Racal-manpacks] PRC320 and dipole? ?
In a message dated 22/09/2010 19:58:42 GMT Daylight Time, iain@... writes:
Feeding the dipole with coax from the transmitter output BNC is the correct : The trouble there Iain is that there no way of knowing the match as the metering is not in circuit,the manual states using the BNC and I guess they (the mil) must have just accepted the slight mismatch etc, after all, even a diploe cut for say 14.200 will be off at 14.250 so I think we just need to accept it.
There was a thread on the clansman_larkspur group a : Thats interesting as the mnual makes no mention of adding a cap, and none is carried in the kit, unlike the Ws19 cap unit.
?
Anyway, out portable next week, will have a play, hi.
?
cheers, Ben.
MARKETPLACE
.
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Re: PRC320 and dipole?
开云体育In a message dated 22/09/2010 19:58:42 GMT Daylight Time, iain@...
writes:
Feeding the dipole with coax from the transmitter output BNC is the correct : The trouble there Iain is that there no way of knowing the
match as the metering is not in circuit,the manual states using the BNC and I
guess they (the mil) must have just accepted the slight mismatch etc, after all,
even a diploe cut for say 14.200 will be off at 14.250 so I think we just need
to accept it.
There was a thread on the clansman_larkspur group a : Thats interesting as the mnual makes no mention of adding a
cap, and none is carried in the kit, unlike the Ws19 cap unit.
?
Anyway, out portable next week, will have a play, hi.
?
cheers, Ben.
? |
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Re: PRC320 and dipole?
Iain G. Moffat
Ben
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Show quoted text
Feeding the dipole with coax from the transmitter output BNC is the correct way to do it - the operator is expected to roll up or unroll the dipole ends for best match. There was a thread on the clansman_larkspur group a few months ago about using the ATU for a dipole (with one leg connected to case ground and one to the antenna terminal) and I seem to recall that the conclusion was that a series capacitor of a few 10s of pf and a suitably high voltage rating between the antenna terminal and that leg of the dipole helped it match. Regards Iain 73 de G0OZS ============ On Sep 22 2010, Military1944@... wrote:
PRC320 and dipole? --
====================================================== Iain G. Moffat (iain@...) +44(0)7850 424 007 ====================================================== |
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Re: PRC320 and dipole?
Hi Ben, No problems feeding the dipole directly, bypassing the internal tuner, I have a dipole cut exactly for 80m (3729Khz) and get good reports when I check on a daily net.? One just have to make sure the dipole is cut to the frequency and present a 50 ohm load to the PRC320 transmitter.? ( I use an antenna analyzer to check the antenna beforehand). Have fun JC VE7OI (Vancouver Island) From: "Military1944@..." To: Racal-manpacks@... Sent: Wed, September 22, 2010 7:27:49 AM Subject: [Racal-manpacks] PRC320 and dipole? ?
PRC320 and dipole?
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Has anyone tried feeding their dipole from the lower rear
socket as apart from the atu mount ?
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Ben. |
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